Why this note exists

The empirical analysis in Chapter 8 identifies a 50-100 mm metric grid in the Australian residential product market (50 mm the dominant component grain, with 25 mm a common but secondary sub-module) across the validated rebuild corpus of 40,342 product dimensions. The finding is read descriptively over a census and warrants situating in the international tradition of modular coordination, both to show that it is not an artefact of one corpus and to state precisely how it relates to the standards that might explain it. This note establishes that context. Its central claim is deliberately modest and is the opposite of an adoption claim: the market’s dominant grain (50 mm, the ISO half-module M/2, on a grid whose dominant values are the standard sheet and door sizes) is consistent with ISO 2848:1984, but it is equally consistent with AS 1684 and with metricated-imperial sizing, and the census cannot single out one of these as causal. ISO 2848 is one mutually-consistent referent among several, not a standard the market has been shown to adopt; and the grain the market concentrates on (50 mm) is in fact coarser than the finest sub-modules ISO permits (25 mm and 12.5 mm). The note is therefore not a warrant for an adoption claim, there is none, but the context that lets the descriptive finding be read against the tradition without over-reading it.

1. The ISO 2848 framework and the definition of 25 mm as M/4

International Standard ISO 2848:1984 (Building construction — Modular coordination — Principles and rules) specifies the foundational framework for dimensional coordination in construction.¹ The standard is paired with ISO 1006:1983 (Basic module), which fixes the basic module at M = 100 mm: in imperial countries, equivalent to 4 inches = 101.6 mm.² Building components, assembly dimensions, and construction grids are to be dimensioned in multiples of M.

The standard also formalises sub-modular increments below the basic module for components that require finer-grain dimensional control:

• Sub-module 0.5M = 50 mm
• Sub-module 0.25M = M/4 = 25 mm

The 25 mm sub-module is an officially recognised dimensional increment within the ISO modular-coordination framework.³⁴ Its intended use is precisely for the class of products the Bunnings corpus contains: plate thicknesses, profile heights, panel thicknesses, hardware reach dimensions, fixing centres: components where 100 mm granularity would over-quantise the design space.

The implication for Chapter 8’s finding must be stated carefully, because the relationship is consistency rather than confirmation. The market’s dominant component grain is 50 mm, the ISO half-module M/2, and 25 mm, the M/4 sub-module, survives as a real but secondary increment. Both values are recognised ISO sub-modules, so the grid the corpus exhibits is consistent with the ISO sub-module hierarchy. But consistency is not adoption: the same values are AS 1684 increments and emerge from metricated-imperial sizing, so the corpus cannot show that ISO in particular shaped the grid. What the data do establish is narrower and worth stating plainly: the market concentrates on the coarser ISO sub-module (50 mm), not on the finest the standard permits (25 mm or 12.5 mm), so where the earlier reading inferred a market “implicitly adopting” the M/4 sub-module, the validated evidence shows the M/4 value present but secondary to the M/2 grain.

1.1 The multimodules and their correspondence to the Bunnings meso-tier

The ISO 2848 multimodule series (3M, 6M, 12M, 15M, 30M, and 60M) defines the coarser dimensional grid used for room dimensions, structural spans, and large components.⁵ In millimetres: 300 mm, 600 mm, 1200 mm, 1500 mm, 3000 mm, 6000 mm.

The validated rebuild corpus’s top-ranked frequency values (see tbl_frequency_threshold_derivation.md) are: 600 mm (n = 1,838, rank 1), 1,200 mm (n = 1,668, rank 2), 900 mm (n = 1,604, rank 3), 2,400 mm (n = 1,081, rank 4), and 450 mm (n = 940, rank 5). Four of the top five are exact ISO multimodules (6M, 12M, 9M, 24M) and the fifth (450 mm) is 4.5M. But these same values are the AS 1684 framing grid and the metricated-imperial sheet sizes (2,400 mm ≈ 8 ft, 1,200 mm ≈ 4 ft, 600 mm ≈ 2 ft), so the coarse grid is multiply determined: it is consistent with the ISO multimodule series rather than identical to it in any way that isolates ISO as the cause.

The same caution applies at both scales. The coarse grid (600 / 900 / 1,200 / 2,400 mm) and the fine grain (50 mm dominant, 25 mm sub-module) are each consistent with the ISO system (multimodules are multiples of M, sub-modules are fractions of M) but each is equally consistent with the Australian framing standard and with metricated-imperial sizing. The corpus shows a metric grid coherent across scales; it does not show which standard produced it, and the earlier claim that the market converges on the ISO system “at both scales” over-read a consistency as an adoption.

2. Historical precedent: modular coordination predates ISO

The ISO 2848 framework is the modern codification of an argument that stretches back to Vitruvius: that a single dimensional unit, repeated, proportioned and subdivided, is the most efficient organising principle for building. Three precedents from the literature ground this lineage and inform the interpretation of the Bunnings finding as more than a one-corpus artefact.

2.1 Japanese kiwari and the ken module

The Japanese kiwarijutsu (木割術) tradition, formalised in the kiwari-sho manuals of the Muromachi and Edo periods (approximately 1392-1868), is the most historically-deep system of procedural dimensional generation in architectural practice.⁶⁷⁸ The ken (a structural bay unit whose regional values ranged from 1757 mm (Edo-tatami) to 1970 mm (Kyōma/Western Kyoto), with the most widespread value being 1818 mm (Inakama/Eastern, ≈ 6 shaku)⁹) is coordinated with the shaku sub-unit of 303 mm, the sun (30.3 mm), and the bu (3.03 mm).

Two primary-source studies refine the interpretation of this tradition in ways directly relevant to the chapter’s argument. Cruz-Saito, Nishida, and Bonnin (2007), in a detailed French-language ethnographic study of tatami and Japanese spatiality, explicitly warn that Western modernists (Gropius cited by name) adopted the tatami as an icon of “normalised modulation” while in fact the mat expresses a dimensional complexity the Western module concept does not capture: the tatami’s size is locally re-calibrated to room and family and cannot be reduced to a single fixed value.¹⁰ Okamoto and Naito (1984) document the tatami-shikiyō-hinagata manuals, early-modern Japanese pattern-books specifying floor-mat layouts by room type, as a formal record of the procedural-generation logic that linked the ken-shaku module to room dimensions via published rules.¹¹ Together these primary sources support the chapter’s analogy: Chapter 9’s procedural module-library generation on the dwelling’s grid, a 50 mm micro grain with a 150 mm meso grid above it, is the algorithmic counterpart of the kiwari rule-book’s procedural generation of room sizes from a ken module.

Two observations from this tradition bear directly on the chapter’s argument. First, the Japanese system was procedural: every derived dimension (column section, rafter depth, beam span, tatami size) was generated algorithmically from the ken through published proportional ratios: the nearest pre-modern analogue to the module-library derivation in Chapter 9. Second, the system permitted regional variation around a shared conceptual module (1757 mm to 1970 mm: a ±6% band around 1850 mm). The Ch8 empirical finding of a dominant 50-100 mm metric grid does not preclude regional drift in the Australian market around those values; it describes the central tendency of the captured corpus. The kiwari precedent shows that an empirical modular grid with regional variation is the historical norm, not the exception.

2.2 The Roman castra and the Vitruvian column-radius module

The Roman legionary camp (castra) codified a standardised spatial plan in which the positions of every major element (praetorium, via principalis, barracks) were repeatable across imperial territory.¹² Vitruvius, in De architectura (first century BCE), made the module explicit at component scale: the radius of a column base is the module from which the entire proportional system of the temple is derived: the earliest formal system of proportional design documented in Western architecture.¹³

The chapter’s metric-grid finding occupies the same conceptual place as Vitruvius’s column-radius: a small dimensional unit, here the 50 mm micro grain, whose consistent application generates a coherent system of larger dimensions. The difference is methodological. Vitruvius deduced his module from a proportional theory of the classical orders; the Bunnings analysis induces its grid descriptively, by lift over a null, from a corpus of 40,342 product dimensions. Both arrive at the same structural intuition, that a small unit carries a coherent modular hierarchy, via opposing epistemic routes, the inductive one reported here making no claim beyond the grid the corpus exhibits.

2.3 SCSD, Ehrenkrantz, and the failure of one-corpus modularity

The School Construction Systems Development programme (SCSD) in 1960s California, led by Ezra Ehrenkrantz, developed a coordinated dimensional system for school buildings based on a 5-foot (1524 mm) planning grid with sub-modular components for structural, mechanical, and lighting subsystems.¹⁴¹⁵ SCSD was successful in its own right, the dimensional coordination allowed multiple subsystem vendors to compete at the component level, but did not generalise beyond schools, because the 5-foot grid was not aligned with residential or commercial practice. The chapter’s finding acknowledges the same boundary: the metric grid it reports (50 mm dominant, 25 mm sub-module) is a property of this domain and this corpus, not a universal optimum.

The ISO 2848 framework is precisely the response to the SCSD boundary problem. By establishing 100 mm (M) as the universal basic module and permitting sub-modules (50 mm, 25 mm) and multimodules (300 mm, 600 mm, 1200 mm) to serve domain-specific applications, ISO creates a dimensional coordination system that spans residential, commercial, industrial, and institutional construction without the narrowness of any single corpus. The Bunnings corpus’s dominant grid is consistent with that universal framework, its values are recognised ISO sub-modules and multimodules, so the Ch8 finding shows the grid the market exhibits to be coherent with the framework, while making no claim that the framework in particular produced it.

2.4 UK and international adoption: Brookes, Osborne, and Milton

The UK’s post-war programme of dimensional coordination, reaching back to the Hertfordshire Schools of 1955, provides the direct lineage for ISO 2848’s residential and educational dimensional standards. Brookes’s 2005 retrospective traces this history and the successive attempts by the UK government and agencies (including the Property Services Agency’s PSA Method of Building) to mandate dimensional coordination, together with the resistance from contractors who preferred the flexibility of non-coordinated dimensions.¹⁶ Osborne’s 1959 paper, one of the earliest primary sources in the English-language modular-coordination literature, offers a concise formal definition that still holds: a module is “a unit of size … which, operating in three dimensions, unifies the work of designer, manufacturer and builder … [postulating] the employment in building of dimensionally related units, components and fittings which are made and shaped to fit together, and which architect and builder know from the start will fit together, without cutting, packing or fitting.”¹⁷ Osborne’s phrase “without cutting, packing or fitting” is exactly the benefit a coordinated dimensional standard delivers to the Bunnings corpus: products dimensioned on a shared metric grid fit together at installation without on-site adjustment.

Milton’s 2018 interim report provides the most recent catalogue of “international, regional (multi-national), and national standards dealing with the principles and practical application of modular and dimensional coordination in building, including joints and tolerances”: a survey that can be cross-referenced when § 8.10’s cross-jurisdictional transferability argument is drafted, since the same review documents the parallel standards in imperial and soft-metric regimes (where M/4 ≈ 25.4 mm = 1 inch).¹⁸ Baldauf’s dissertation on Brazilian modular coordination (2004) provides a useful parallel case: Brazil, like Australia, operates ISO-aligned metric standards but has struggled to achieve full market-level coordination in the absence of strong code mandates: a situation the metric-grid finding suggests may apply in Australia too (emergent coordination on a shared grid in the product corpus, with no formal ISO compliance audit and no evidence that ISO in particular is the coordinating standard).¹⁹ The mid-1960s Spanish theoretical programme (Yraola 1966a, 1966b, 1966c) documents the continental European adoption of modular coordination in the pre-ISO era: providing a reference point for the specific design-theoretic arguments that led to the 100 mm basic module being adopted over alternatives such as 120 mm or 200 mm.^{20 2122}

3. Why a retail corpus exhibits a coherent metric grid

The method applied in Chapter 8, sweep all candidate base modules with no normative floor and score each by its lift over a reporting-convention null, finds a 50-100 mm metric grid rather than a smear of arbitrary dimensions. That a national retail corpus should exhibit a coherent metric grid at all is explained by three mechanisms documented in the literature on power-law and modularity dynamics. None of these mechanisms is specific to ISO 2848: each predicts convergence on a shared grid, and in the Australian market ISO 2848, AS 1684, and metricated-imperial sizing all point at the same coarse values, so the mechanisms explain the existence of the grid without isolating its cause.

3.1 Power-law dynamics in coordinated systems

The Pareto principle (the 80/20 rule) describes an emergent property of systems governed by preferential attachment, multiplicative growth, or scale-invariant selection pressures, rather than an arbitrary ratio.²³ In a market where each product’s commercial viability depends on compatibility with existing dimensional conventions, a preferential-attachment dynamic operates: products dimensioned on modules already in wide use are more likely to be specified, stocked, and installed. The module with the most support attracts more support; the result is a power-law-like convergence on a small number of dominant module values.²⁴

Where the dimensional conventions in force in the jurisdiction (ISO 2848, AS 1684, and the metricated-imperial sheet trade, all mutually consistent at the values they share) concentrate on a metric grid, the preferential-attachment dynamic will pull product dimensions onto that grid. The chapter’s 50-100 mm grid is the empirical signature of exactly this dynamic; because the converging conventions agree at the coarse values, the dynamic explains why the grid exists without identifying any one standard as the attractor.

3.1a Corpus-based module analysis: a research lineage

The broad approach used in Chapter 8, analysing a candidate set of base modules against a product corpus to identify the grain a market expresses, has an established lineage in the modular-product-family design literature. The present method differs from that tradition in two ways worth stating, so the precedent is not mistaken for the method: Chapter 8 scores candidates by descriptive lift over a reporting-convention null with no normative floor, not by a fitness or quality-loss function to be optimised, and it makes no optimisation or selection claim; it reports which grain the corpus exhibits. With that distinction made, four heavily-cited primary sources locate the corpus-based module-analysis approach in a twenty-year research tradition:

• Rai and Allada (2003) introduce an agent-based Pareto-optimisation framework for modular product-family design, pairing a Pareto-frontier search over module configurations with a post-optimal quality-loss function analysis. Their method sits adjacent to Chapter 8’s at a smaller scale, and the contrast is the point: where they select a module set that maximises a coverage-like objective under a quality-loss constraint, Chapter 8 does not select or optimise but measures, by lift over a reporting-convention null, which grain the corpus already exhibits.²⁵
• Chakravarty and Balakrishnan (2001) formalise the trade-off between manufacturing cost, development cost, and market share in modular product design. They show that the number of variants and the choice of module variation values are jointly determined by the cost-share curve’s knee: structurally the same knee argument, though Chapter 8 makes no optimisation claim: its descriptive reading finds the 50 mm grain carrying the highest lift over the reporting-convention null, with 25 mm surviving as the finest sub-module beneath it rather than as a selected optimum.²⁶
• Yigit and Allahverdi (2003) frame optimal module-instance selection as an integer nonlinear programming problem with a quality-loss objective, demonstrating that the Pareto-optimal module set is a small subset of the candidate space: consistent with the unconstrained sweep (m over the [2, 300] mm range) concentrating on a single dominant grain, 50 mm on the validated rebuild, with 25 mm present but secondary.²⁷
• Song and Kusiak (2009) explicitly mine Pareto-optimal modules from historical product sales data for delayed product differentiation: arguably the closest methodological analogue to Chapter 8’s Bunnings-corpus mining approach. Their framework estimates demand probability from sales data and selects modules to maximise a joint commonality-and-differentiation objective; the 50 mm dominant grain can be read as the commonality-maximising grain of the Bunnings corpus, with 25 mm a secondary sub-module, read descriptively rather than as an optimised selection.²⁸

These four heavily-cited papers establish that analysing a candidate set of modules against product data is a canonical move in product-family design. Chapter 8’s contribution is its application to a large retail corpus rather than a single manufacturer’s product line, and its descriptive posture: where that literature optimises a module set against a cost or quality-loss objective, Chapter 8 only measures, by lift over a null, which grain the corpus already exhibits, and draws no optimality claim. This both locates the work within a mature research tradition and marks where it departs from it.

Two further supporting citations frame the method’s broader context: Wei, Liu, Lu, and Wuest (2015) on multi-principle module identification for product platforms,²⁹ and Goswami (2018) on integrative product-line redesign under competitive-market constraints.³⁰ Both extend the Pareto-selection framework to multi-objective and redesign contexts, indicating that the method travels well to adjacent problem classes: which supports the chapter’s external-validity argument that the Bunnings method could transfer to other jurisdictions or corpora (noted as open research in §8.63 and §11 discussion).

3.2 Network effects of a shared modular API

Modularity is not only a geometric or ergonomic property; it is a network-effect property.³¹ Each additional product dimensioned on the shared metric grid increases the value of every other grid-dimensioned product in the ecosystem: stacking, nesting, fastening, alignment, and coordination all improve. The Bunnings corpus’s concentration on a 50-100 mm grid is therefore the built signature of a market where that grid has crossed the network-effect threshold at which conformance is cheaper than deviation. The theoretical prediction (that where shared dimensional conventions are locally effective, products converge on a common grid) matches the empirical result; the prediction is about convergence on a grid, and does not identify ISO 2848 as the specific convention at work.

3.3 Modularity as socio-technical contract

The final mechanism, documented in contemporary modular-systems literature, is that modular coordination is a governance regime as much as a technical one.³² Three institutional elements are required for a modular system to sustain: (1) specification of what may vary (component internals, material, finish); (2) specification of what is fixed (the interface dimension); (3) a governance regime that rewards conformance. The Bunnings ecosystem supplies all three: product diversity is preserved across the corpus’s many product types; the metric grid is the fixed interface (across the validated corpus the 50 mm grain carries the highest lift of any standard grain over the reporting-convention null in every cohort, with 100 mm next and 25 mm a secondary sub-module); and conformance is rewarded through reduced product-integration friction at point of sale.

4. The Australian regulatory context

The National Construction Code (NCC), published by the Australian Building Codes Board, is the performance-based building standard that governs residential and commercial construction throughout Australia.³³ The NCC references AS 1684 (Residential timber-framed construction) for timber framing, AS 2870 (Residential slabs and footings) for foundations, and associated standards for components such as plasterboard (AS/NZS 2588), glass (AS 1288), and fixings. These documents make no formal ISO 2848 requirement. They are nevertheless structured around dimensional conventions (450 mm and 600 mm stud spacings, 1200 × 2400 mm plasterboard sheets, 900 mm door leaves, 1800 mm window-sill heights) most of which are directly ISO multimodules (600 mm = 6M, 1200 × 2400 mm = 12M × 24M, 900 mm = 9M, 1800 mm = 18M); the 450 mm stud spacing is a multiple of the M/2 = 50 mm sub-module (9 × 50 mm), not an integer multimodule of the 100 mm basic module.³⁴ The Australian residential construction system is in practice ISO-coordinated even where it is not ISO-mandated.

Three caveats are important for the Ch8 argument.

First, the Australian modular construction market, as distinct from the broader traditional construction market, remains niche, at 5-8% of output as of 2024, with strong concentrations in Victoria (manufacturing base) and Queensland (government procurement).³⁵ The metric-grid finding therefore applies to the broader product-supply market (which Bunnings anchors) rather than the modular-construction-manufacturing subset.

Second, using Bunnings as a corpus proxy is a novel methodological choice: comparable dimensional-analysis studies typically draw on standards documents, manufacturer specifications, or project datasets rather than a national hardware retailer’s product catalogue. Adopting the catalogue is at once the methodological contribution Chapter 8 makes and a limitation whose representativeness must be argued explicitly in Section 8.10. Commentary on construction-industry data maturity (the Housing Industry Association and the Australian Building Codes Board both note the “data fog” around prefabrication terminology³⁶) makes the Bunnings-proxy method defensible as the best available alternative in a low-data-maturity national market.

Third, AS 1684’s specific dimensional provisions (stud centres, wall-plate sections, bearer depths) operate on 25 mm and 50 mm increments within the broader 3M/6M/12M framework.³⁷ Chapman’s 1981 primary source confirms the 600 mm stud-spacing convention (= 6M = 24 × M/4) that has governed Australian timber framing for decades.³⁸ Jiang, Ottenhaus, and Gattas (2023) demonstrate a current-practice parametric extension: their parametric framework for AS 1684 span tables reduces the over-specification of timber products by exploiting the systematic dimensional relationships embedded in the standard: an explicit computational-design use of the modular coordination the chapter identifies empirically.³⁹ That AS 1684 itself works in 25 mm and 50 mm increments mirrors the validated finding exactly, a 50 mm dominant grain with 25 mm as its sub-module, so the metric-grid finding is coherent with, rather than merely adjacent to, the specific Australian residential standard that governs the target construction domain, without that coherence implying the market follows ISO 2848 in particular.

Fourth, recent Australian prefabrication research (Navaratnam, Rahardjo, and Godakandage 2025) provides an evidence-based assessment of the potential for upscaling prefabricated timber modular buildings in Australia: a parallel study that, like Chapter 8, combines empirical audit of current practice with design-system implications.⁴⁰ Dewsbury, Tooker, and Fay (2013) document the Australian residential thermal-performance regulations adopted under the National Construction Code, tracing their impact on wall- and roof-material dimensions: the regulatory coupling that shapes which ISO multimodules become effectively required in Australian construction practice.⁴¹ Clayton (2010) adds a component-level view: his paper on steel wall studs with service holes notes that the 30 mm service-hole convention (which aligns with the finer M/10 = 10 mm sub-module, 30 = 3 × 10 mm, rather than the 25 mm sub-module) reflects a further layer of dimensional coordination between framing and services that is assumed without formal codification.⁴²

5. Implications for the chapter’s claims

Integrating the literature context above, the bearing on the chapter’s validated claims (printed here at their authority-ID anchors, CL-8-01, CL-8-02, and CL-8-03) is as follows:

1. CL-8-01: §8.21, the metric-grid finding. The chapter reports a 50-100 mm metric grid, with 50 mm the dominant component grain and 25 mm a secondary sub-module, recovered by lift over a reporting-convention null with no normative floor. The literature situates this as a market exhibiting the shared metric grid that ISO 2848, AS 1684, and metricated-imperial sizing jointly express, but it is framed throughout as consistency, not adoption: the grid is multiply determined, and the analysis does not isolate ISO as its cause. This is the honest replacement for the earlier “25 mm Pareto-optimal / market adopted ISO” framing, which was an artefact of an ISO-anchored search floor plus an un-baselined coverage score and is not reproduced by the validated rebuild.

2. CL-8-02: §8.26, the dimension-value library. The corpus’s most frequent values (600, 1,200, 900, 2,400, 450 mm) are ISO multimodules, but equally AS 1684 framing values and metricated-imperial sheet sizes. They are reported as the heavy-tailed head of the value distribution that grounds the required/common/rare library partition, consistent with the preferred series rather than evidence that the market validates ISO’s series in particular.

3. SL-01: §8.63, the corpus scope limit. The representativeness argument is stated as a plain scope limit: the Bunnings corpus is one retailer, one snapshot, Australia, title-stated nominal dimensions only, ~52 per cent product coverage, read descriptively over a census. It is not an ISO compliance audit and licenses no inference that ISO 2848 is followed in Australia: only that the dominant grid in this retail corpus is consistent with the ISO sub-module and multimodule values. A cross-jurisdictional extension to imperial-unit markets (basic module 4 in = 101.6 mm; sub-modules near 25.4 mm) is an open research question flagged here and returned to in Chapter 11.

6. References supporting Chapter 8 integration

The sources supporting the §8.21, §8.26, and §8.63 prose are grouped by theme below; full bibliographic details appear in the footnotes throughout this note.

International standards

• ISO 2848:1984: Modular coordination principles and rules
• ISO 1006:1983: Basic module (M = 100 mm)
• ISO 1040 (referenced in 2848): Multimodules

6.2 Modular-coordination theory and history

• Osborne (1959), Modular Co-Ordination as Related To Sanitary Accommodation and Fittings
• Yraola (1966a/b/c), three seminal Spanish papers on ISO modular-coordination theory
• Brookes (2005), Theory and Practice of Modular Coordination: UK history from the Hertfordshire Schools, 1955
• Baldauf (2004), Contribuição à implementação da coordenação modular da construção no Brasil
• Milton (2018), International and National Standards on Dimensional Coordination, Modular Coordination, Tolerances and Joints

6.3 Corpus-based module analysis: research lineage (the present method departs from its optimisation framing)

• Chakravarty and Balakrishnan (2001), Achieving product variety through optimal choice of module variations
• Rai and Allada (2003), Modular product family design: Agent-based Pareto-optimization …
• Yigit and Allahverdi (2003), Optimal selection of module instances for modular products …
• Song and Kusiak (2009), Mining Pareto-optimal modules for delayed product differentiation
• Wei, Liu, Lu and Wuest (2015), A multi-principle module identification method …
• Goswami (2018), An integrative product line redesign approach …

6.4 Japanese kiwari and ken tradition

• Engel (1964), The Japanese House: A Tradition for Contemporary Architecture
• Okamoto and Naito (1984), Types of the Architectural Manuals “Tatami-Shikiyō-Hinagata”
• Cruz-Saito, Nishida and Bonnin (2007), Le tatami et la spatialité japonaise …, Ebisu 37
• Sustainability 15(7): 5800 (2023): kiwari measurement study
• Building Research Institute Japan, Research Paper 131: traditional wooden structure dimensional analysis

6.5 Pareto and power-law dynamics: theoretical anchor

• Newman (2005), Power laws, Pareto distributions and Zipf’s law, Contemp. Phys. 46

6.6 Australian context

• AS 1684 series: residential timber-framed construction
• AS 2870: residential slabs and footings
• National Construction Code (ABCB, current edition)
• Chapman (1981), Timber Wall Framing …
• Dewsbury, Tooker and Fay (2013), thermal performance of Australian lightweight residential construction
• Clayton (2010), Design of Steel Wall Studs with Service Holes
• Jiang, Ottenhaus and Gattas (2023), A parametric design framework for timber framing span tables
• Navaratnam, Rahardjo and Godakandage (2025), An evidence-based assessment of the potential for upscaling prefabricated timber modular buildings
• Housing Industry Association guidance on AS 1684: industry practice

6.7 Research method: module-lift over a reporting-convention null on the Bunnings corpus

• Rai and Allada (2003); Chakravarty and Balakrishnan (2001); Yigit and Allahverdi (2003); Song and Kusiak (2009): the research lineage of corpus-based module analysis (from which the present method departs by scoring descriptive lift over a null rather than optimising a fitness)
• Newman (2005): theoretical anchor for the power-law-emergence argument
• CL-8-03: robustness of the 50 mm dominant grain across three cohort cuts and a matching-tolerance sweep over the unconstrained search range: descriptive recurrences over the complete census, with no interval estimate or significance test attached