Whole-house retrofit · Wales
Whole-house retrofit in Gwynedd
Retrofit programmes in Gwynedd work when insulation, airtightness and ventilation are planned together. We install to the design your coordinator signs off.
Social landlords in Gwynedd can appoint us for whole-house retrofit, from a single home to a programme. Most social homes in Gwynedd belong to housing associations after the council transferred its stock. We work to the Welsh Housing Quality Standard 2023 and to your own specification.
Gwynedd at a glance
- Council
- Gwynedd Council
- Nation
- Wales
- Council homes
- Transferred to housing associations
- Housing standard
- WHQS 2023 (Wales)
- Damp and mould timescales
- No timescale law found
- Population
- 125,171 (2020 estimate)
- Regional price factor
- 0.93 (VOA 2026)
Council housing status from published stock transfer histories (11 transfer and 11 stock-retaining councils), not yet checked against StatsWales tables. Population: ONS 2020 mid-year estimate.
Who owns the social homes in Gwynedd?
Most social homes in Gwynedd are owned by housing associations, following the transfer of the council's homes to housing association ownership. Eleven of Wales's 22 councils took this route. Gwynedd Council remains the strategic housing authority, with duties on homelessness and housing need.
What do we cover in Gwynedd?
- Fabric measures: external, internal and cavity wall insulation, loft and floor insulation
- Ventilation upgrades to match the improved airtightness
- Solar PV where it is part of the design
- Resident liaison through a disruptive programme
- Handover data for lodgement and post-installation evaluation

How do we deliver it?
We do not treat a measure in isolation. If the design adds insulation and airtightness, we make sure the ventilation upgrade is in the same programme, because condensation is the most common retrofit failure.
Which rules apply in Gwynedd?
WHQS 2023 asks Welsh social landlords to set a Target Energy Pathway for their homes by 31 March 2027, informed by a whole stock assessment.
WHQS 2023 (Wales) · More about whole-house retrofit
What does whole-house retrofit cost in Gwynedd?
Our guide range for whole-house retrofit towards EPC C in Gwynedd is £12,550–£21,950 per home. That is the UK range of £13,500–£23,600 (published figure) adjusted by a regional cost factor of 0.93 (VOA Rating Cost Guide 2026: 0.88–0.98); figures are before VAT where the source states it. Every job is priced after survey; specification, access and the condition of the homes will move the figure.
Questions about whole-house retrofit in Gwynedd
Does Gwynedd Council still own council homes?
Most social homes in Gwynedd are owned by housing associations, following the transfer of the council's homes to housing association ownership. Eleven of Wales's 22 councils took this route. Gwynedd Council remains the strategic housing authority, with duties on homelessness and housing need.
Can you take on whole-house retrofit in Gwynedd as a subcontractor?
Yes. Main contractors working for social landlords in Gwynedd can engage us as a tier-2 subcontractor for whole-house retrofit, working under their systems and their client's specification.
Which housing standard applies in Gwynedd?
Social landlords in Wales work to the Welsh Housing Quality Standard 2023, which has applied since 1 April 2024, with all homes to comply by 31 March 2034.
Other works we carry out in Gwynedd
- Kitchen replacement programmes
- Window and door replacement
- External wall insulation
- Planned maintenance and Decent Homes works
- Void property works
- Fire door installation and remediation
- Estate and external works
- Responsive repairs
- Smoke, heat and CO alarm installation
- Roofing and rainwater goods
- Damp and mould remediation
- Heating upgrades and heat pumps