Modular Infrastructure for Inclusive Housing

Ground-up Application of a Modular Framework to Improve Housing for Ability-Diverse Living

A draft thesis submitted for the degree of Doctor of Philosophy — Tran Thien Toan Ngo, Western Sydney University. Bibliographic detail on the Title Page.

ABSTRACT

Households whose abilities differ (with age, with disability, with the changing membership of a life-stage) make demands on their housing that shift across a building’s long life. Most will be housed by stock that already stands, so the binding question is how much change an existing dwelling can absorb. That capacity is limited, on our reading, as much by a dwelling’s representational infrastructure (its drawings, schedules, certificates, and the regulatory texts they answer to) as by its physical fabric: a change meant to stay local repeatedly forces global re-checking across every commitment that holds the dwelling together. Keeping a local change local, a problem of representational governance, is what this thesis treats as a design-science problem and answers with a modular architecture for the dwelling.

The response transposes two lineages onto housing. From the study of complex systems (Simon, Parnas, Baldwin and Clark) it takes the principle that change stays tractable when interdependence is bounded by stable interfaces that publish what others may rely on and hide what lies within; from Open Building, the layered dwelling whose long-life support carries a renewable short-life infill. Joining them yields the thesis’s central artefact, a Governed Kernel Architecture: a governed kernel (a small set of design rules, nine module types over a stratified vocabulary of seven primitives and seven composites, a variant-inheritance rule, and explicit interface contracts) around which life-cycle variation is absorbed in a bounded governed instance library. The kernel is governed rather than frozen: fixed for any given configuration, yet revisable through a rule-bound, versioned path. The architecture is set out as a design theory and instantiated through a coordinated artefact suite: a schema that renders regulatory prose queryable; the module system that houses the kernel; a planimetric notation that can be written and read back without loss of meaning; a generation-and-documentation pipeline; and an empirical substrate of 745 Australian floor plans. Specialist Disability Accommodation under Australia’s National Disability Insurance Scheme serves as the proving ground, not the subject, because it concentrates the difficulty into one auditable instrument.

The decisive test sits at a single fork: one four-bedroom dwelling branches two ways (the original occupants ageing in place, or a higher-support refurbishment with an attached secondary dwelling) and both are absorbed without the governed kernel moving. A representation that travels intact between actors, and one that confines the effects of a local change, appear well supported; governed variation under shared rules holds at moderate confidence within the single branch examined; faithful replay of authoring acts, and net benefit across a dwelling’s life, remain only partly established. Wider rater studies, further trajectories, other building stocks and regulatory regimes, and a production implementation would extend the warrant.

Keywords: modular architecture and design rules; governed kernel; housing adaptation; representational governance; Open Building; planimetric notation; design science research.

About this thesis

Ability-diverse households — whose abilities vary by disability, by age, or by life-stage — make demands of housing that evolve across the long life of their buildings, and most are housed by stock that already stands. The binding constraint is the absorption capacity of that existing fabric: how much change a dwelling already standing can take up as the needs of its occupants shift.

The thesis answers with a modular architecture for the dwelling, the Governed Kernel Architecture. Its central move is a governed kernel — stable, yet revisable only through a rule-bound, versioned promotion path — built in two layers: a Generative Grammar of seven schematic primitives and seven elaborated composites related through ten relation operators, and a Modular Contract System of nine module-types with interaction rules and a variant-inheritance mechanism. Beneath the kernel, a governed instance library absorbs life-cycle change while the kernel stays fixed for any given configuration. This is modularity in Baldwin and Clark’s publish/hide sense, transposed to the dwelling and joined to Open Building’s long-life support and short-life infill.

That architecture is the engine, and the five-artefact suite of Chapters 5–9 exists to encode, instantiate, validate, and operate it: a queryable schema for accessibility standards, the module system that houses the kernel, a formal notation for floor plans, an empirical substrate from a census of 745 Australian floor plans, and a generator for documented dwelling variants.

The architecture is tested on a single fork (Chapter 10): one 165-square-metre four-bedroom dwelling branches two ways — the original occupants ageing in place, or a higher-support SDA refurbishment with an attached secondary dwelling — and both are absorbed in the governed instance library without disturbing the governed kernel. Specialist Disability Accommodation under Australia’s National Disability Insurance Scheme is the proving ground, not the subject: the architecture is general, and SDA supplies the evidence.

New readers should start with the Background Context for the social and policy setting, then the Thesis Structure Overview for a reading map of how the parts hand off to one another. The map below shows the twelve-chapter spine.

thesis_map — **Thesis map — the twelve-chapter spine in five phases** The thesis proceeds through twelve chapters in five phases: a goal phase (Chapters 1–2) establishing the problem and its warrants; a theory-and-method phase (Chapters 3–4); five artefact chapters (Chapters 5–9 — the standardisation schema, the Governed Kernel Architecture, the notation, the empirical substrate, and the generator); a demonstration-and-evaluation chapter (Chapter 10); and a value phase of discussion and conclusion (Chapters 11–12). Solid arrows follow the chapter sequence; the two dashed arrows mark conceptual dependencies that do not follow chapter numbering.

Front Matter

Orientation

Chapters

Problem and Foundations (Chapters 1–4) — the research problem and its warrants, then the theory and method that answer it.

The Artefact Suite (Chapters 5–9) — five artefacts that instantiate one architecture, each designed, built, and evaluated before handing a contract to the next.

Demonstration and Synthesis (Chapters 10–12) — the decisive test, then the discussion and conclusion that draw out its value.

Chapter 10: Demonstration and Evaluation
Chapter 11: Discussion
Chapter 12: Conclusion

Appendices

The forty appendices below are grouped into nine lettered clusters (Appendix A–I), ordered from theory and exposition through to data; each cluster gathers the distinct appendices that share a theme. See also the Appendix Index and the Supplementary Index, which additionally catalogue the interactive HTML artefacts with their static-image fallbacks.

Appendix A — Research Commitments and Contributions

A.1 Standing Research Commitments — Four thesis-wide commitments disciplining modularity, governance, and evidence claims.
A.2 Contribution and Design Rules — Transferable technical rules and prescriptive design-science principles with refutation conditions.

Appendix B — Conceptual and Literature Evidence

B.1 Modularity-Definition Corpus Profile — Cross-domain corpus screening profile grounding Chapter 2’s modularity synthesis.
B.2 Text-Based Floor-Plan Representations Evidence Profile — Screening and extraction evidence on text-based floor-plan representations for Chapter 2.
B.3 Biological Degeneracy, Canalisation, and Motor-Synergy Analogues — Biological-analogue argument for bounded optionality referenced in Chapter 2.

Appendix C — Text as a Building Medium

C.1 Text as a Building Medium: Non-Graphic Construction Knowledge in Historical Practice — Cross-cultural historical evidence for text-mediated construction-knowledge transmission and reconstruction.
C.2 Text as a Building Medium — Citation Ledger — Twenty-one claims mapped to citations and source tiers for the preceding essay.

Appendix D — Requirements, Grounding, and Traceability

D.1 Environmental Grounding Dossier — Six environment-grounded requirement cards with problems, costs, and acceptance criteria.
D.2 Environment-Derived Requirements Register — Six environment-derived requirements traced to evaluation and demonstration evidence.
D.3 Requirements–Design–Evaluation Traceability Matrix — Auditable chain linking requirements, design features, and evaluation measures (ER-to-DF-to-EM).
D.4 Evaluation Workbench — Evaluation measure specifications (EM-4W-01 to EM-09-04) and pre-declared evaluation question contracts (EQ-01 to EQ-05).

Appendix E — Notation and Schema Specifications

E.1 RecPol Specification — Formal Core — Formal core language for rectangular polyominoes underlying PlaniSyn (axioms, three-plane world model, EBNF grammar, predicate semantics, error codes).
E.2 PlaniSyn Grammar — Technical Specification — Technical specification of the PlaniSyn text-based planimetric notation grammar (object model, tag grammar, interaction types, nesting).
E.3 Standards Serialisation Schema Specification — Five-layer governed schema architecture: fields, validation rules, and ambiguity handling.
E.4 Space-Category Taxonomy — Nine SDA module-type and four-category design taxonomy reference.

Appendix F — Reference Catalogs and Dictionaries

F.1 Code-Families Legend — Consolidated legend of short-form identifier prefixes used thesis-wide (SP, ER, DF, EM, EQ, EVID, TR, and the rest).
F.2 Data Dictionaries — Operational definitions for the PlaniSyn, RecPol, and SDA clause vocabularies.
F.3 Artefact-Suite Handoff Contracts — Sequential handoff products inherited and left between the five artefacts.
F.4 Artefact-Suite Evolution — Superseded pipeline and notation-framing approaches documented for trajectory transparency.
F.5 Canonical Property-Proposition-Evaluation Map — Single consolidated Property, Proposition, EQ, EM, and EVID mapping that every Chapter 10 to 12 verdict recital cites.
F.6 Deposit Scope and Deposited-Artefacts Catalog — The thesis deposit scope, enumerating the deposited data bundles, artefact packages, and interactive surfaces by chapter, with the integrity discipline that warrants them.

Appendix G — Chapter 5 SDA Corpus Data and Results

G.1 Chapter 5 Evaluation Results and Data Package — Complete Chapter 5 evaluation results and the deposited supplementary data package.
G.2 Chapter 5 Reference Tables — Reference tables relocated from Chapter 5, preserving the full census data.
G.3 SDA Corpus Integrity Metrics — Structural-completeness and identity-stability baseline for the text corpus.
G.4 Trigram and Part-of-Speech Structural Metrics — Phrase-level trigram and part-of-speech patterns across 605 clauses.
G.5 Foundational Primitive Mapping Coverage — Coverage mapping high-frequency terms onto the fifteen spatial-semantic primitives.
G.6 Predicate Coverage and Deontic Force — Deontic-force classification and predicate vocabulary for the figures channel.
G.7 Polysemy Burden Assessment — Three forms of polysemy burden in the serialised figures corpus.
G.8 Figures-Channel Ambiguity Analysis — Five-dimensional ambiguity-resolution analysis of the figures channel.
G.9 Cross-Channel Validation Results — Text–figures channel complementarity and non-redundancy validation results.
G.10 Data Pipeline and Reproducibility — Data pipeline, file inventory, and reproducibility verification procedures.

Appendix H — Chapter 8 Spatial-Topology Data and Metrics

H.1 Polyomino Combinatorics and Shape Grammar — Polyomino combinatorics and shape-grammar grounding for the generator (D4/D8 canonicalisation, adjacency-class definitions).
H.2 Packing-Efficiency Metrics — Literature grounding for the CEI / EEI / BEI packing-efficiency metrics.
H.3 Topological Coupling and Adjacency Graph Theory — Space-syntax grounding for coupling classification and the NCC-silence claim.
H.4 Dimensional Modularity and ISO 2848 Grounding — ISO 2848 modular-coordination grounding for the 50 mm dominant grain (25 mm secondary sub-module).
H.5 Numerical Design References from the Floor-Plan Geometry Census — Observed room-size targets, dimensional grid, fixture packing densities, and context-conditioned size rules read off the 745-plan geometry census (descriptive statistics over the complete enumeration).
H.6 Empirical Design Rules from the Floor-Plan Geometry Census — A small set of pattern-language-style design rules, each stated over a measured scope with an explicit falsifier (for example, scaling by room count rather than by dimension).
H.7 The Componential Space Lexicon — Standard room categories defined as formulae over distinctive feature bundles (function, host, fixture signature, edge), so each category means the same thing for every reader.
H.8 The g-Primitive Kit as the Generator’s Grounded Vocabulary — The data-derived geometric-primitive kit measured off the census that grounds the Chapter 9 generator’s vocabulary.

Appendix I — Figure Traceability

I.1 Cross-Chapter Figure Traceability Matrix — Per-chapter figure counts mapped to supporting data and sources.