In short: HMO energy upgrades improve the energy performance certificate (EPC) rating and cut running costs: loft and wall insulation, heating and controls, glazing, ventilation and lighting. In Gwynedd we survey first, price each item separately and hand over the certificates and photos a council asks for.
- Nation
- Wales
- Pricing region
- Wales
- Postcode areas
- LL, SY
- Main towns
- Bangor (Gwynedd)
What do EPC and energy upgrades in Gwynedd involve?
- Ventilation to control condensation
- Loft and roof insulation
- LED lighting
- A post-works EPC through your assessor
- Internal or external wall insulation
- Review of the EPC recommendations
Which rules apply in Gwynedd?
- Rented homes must meet at least EPC E. Whether the planned EPC C standard will apply in Wales has not yet been confirmed.
- Councils assess hazards, including damp and mould, under the HHSRS, alongside the fitness for human habitation rules for occupation contracts.
- Building regulations cover structural work, partitions, drainage, fire-resisting construction and electrics; confirm with building control whether the conversion is a material change of use.
Welsh councils set their own HMO standards and may run additional licensing. In Wales, changing a house to a C4 HMO always needs planning permission, so check planning first.
How much do EPC and energy upgrades cost in Gwynedd?
| Item | UK typical | Local guide | Per |
|---|---|---|---|
| Loft insulation, whole house | £650 – £1,250 | £610 – £1,200 | house |
| Internal wall insulation | £60 – £100 | £60 – £90 | m² of wall |
Typical time on site: 2–15 working days. For a figure for your house, try the guide-price tool.
EPC and energy upgrades by town in Gwynedd
Questions about EPC and energy upgrades in Gwynedd
Are there grants?
Some schemes support landlords. Eligibility changes, so check the current government and energy company schemes for your nation.
Will insulation cause condensation?
Not if it is designed with ventilation and vapour control. We always pair insulation with suitable ventilation.
Do you carry out EPC and energy upgrades across Gwynedd?
Yes, across the whole of Gwynedd, including Bangor (Gwynedd).
Who licenses HMOs in Gwynedd?
Gwynedd council licenses HMOs in its area. Landlords must also register with Rent Smart Wales.
Other HMO services in Gwynedd
- Damp, mould and HHSRS repairs in Gwynedd
- Full HMO refurbishment in Gwynedd
- Commercial and above-shop to HMO in Gwynedd
- Rewires and EICR remedials in Gwynedd
- Professional and co-living HMO refurbs in Gwynedd
- Loft conversions for extra rooms in Gwynedd
- Student HMO refurbishment in Gwynedd
- Small HMO conversions (3–6 sharers) in Gwynedd