Fabric-first planning
A practical sequence for considering walls, roofs, floors, openings and junctions before adding technology.
Practical Points
- 1.
Record construction, damp exposure, ventilation and services.
- 2.
Compare whole-envelope options, including junctions and retained elements.
- 3.
Use a heat-loss assessment and specify build-ups rather than promising savings from thickness alone.
Considerations & Trade-offs
Work to existing fabric can be disruptive and constrained by details.
Improving one element may expose moisture, ventilation or threshold issues elsewhere.
Concept Scenarios
Semi-detached loft concept
A discussion framework for roof-space accommodation while coordinating structure, fire, insulation, glazing and ventilation.
Options Included:
- Dormer with coordinated warm-roof build-up
- Roof-window-led layout
- Phased fabric and services plan
Rear extension concept
A concept route for a connected living space, with envelope, daylight, drainage and heating considered before finishes.
Options Included:
- Single-storey extension with rooflights
- Glazed opening with shading considered early
- Fabric-first shell with later fit-out
Passive retrofit concept
A staged retrofit thought experiment starting with diagnosis and envelope continuity, then ventilation and heating decisions.
Options Included:
- Survey and repair first
- Airtightness and ventilation package
- Fabric works sequenced with heat-pump readiness
External wall insulation upgrade concept
A concept for improving an external envelope while testing moisture, junctions, rainwater goods, openings and finish compatibility.
Options Included:
- System EWI with revised reveals and sills
- Targeted insulation at constrained elevations
- Whole-envelope sequence with roof and services
Related Internal Resources
Official Guidance & Technical Sources
Content angles / Explore further
- • LinkedIn: show why the retained wall, roof, floor and junctions belong in one retrofit plan.
- • Nextdoor: share three survey questions before anyone prices insulation.
- • Pinterest: pair a fabric detail with the service and maintenance space it needs.