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guidance
Reviewed: 22 September 2026Airtightness and MVHR
Why air leakage, controlled ventilation, filters and commissioning belong in one design conversation.
Practical Points
- 1.
Define the airtight layer and protect it at windows, services and junctions.
- 2.
Size and route ventilation for rooms, access, noise and filter replacement.
- 3.
Require commissioning records and explain controls to occupants.
Considerations & Trade-offs
Duct routes and service zones consume space and need coordination.
Filters and fans need ongoing access, cleaning and maintenance.
Concept Scenarios
CONCEPT CASE STUDY — NOT A D-CORE PROJECT
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
CONCEPT CASE STUDY — NOT A D-CORE PROJECT
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
Related Internal Resources
Official Guidance & Technical Sources
Content angles / Explore further
- • YouTube: trace an MVHR route from intake to filter access without promising a comfort result.
- • WhatsApp: ask where the airtight layer is marked around each service.
- • LinkedIn: discuss commissioning records and occupant handover as part of the system.