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. We carry this out across Cardiff, priced against the HMO rules for Wales and the council’s own standards.
- Nation
- Wales
- Pricing region
- Wales
- Postcode areas
- CF
- Main towns
- Cardiff, Whitchurch
What do EPC and energy upgrades in Cardiff involve?
- Loft and roof insulation
- A post-works EPC through your assessor
- Heating, hot water and smart controls
- Double or secondary glazing
- Ventilation to control condensation
- LED lighting
Which rules apply in Cardiff?
- 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.
Cardiff Council: local HMO schemes
| Additional licensing | In force in part of the council area Cathays: 1 Feb 2023 to 1 Feb 2028. Plasnewydd had a scheme from 1 Jan 2021; check with Cardiff Council whether it has been renewed. |
|---|---|
| Selective licensing | No scheme found |
Schemes change. Check the council’s current pages for the exact address in Cardiff before you buy or start work. Source: Cardiff Council HMO licensing page, checked 2026-10-31.
How much do EPC and energy upgrades cost in Cardiff?
| 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 Cardiff
Questions about EPC and energy upgrades in Cardiff
Will insulation cause condensation?
Not if it is designed with ventilation and vapour control. We always pair insulation with suitable ventilation.
Are there grants?
Some schemes support landlords. Eligibility changes, so check the current government and energy company schemes for your nation.
Do you carry out EPC and energy upgrades across Cardiff?
Yes, across the whole of Cardiff, including Cardiff, Whitchurch.
Who licenses HMOs in Cardiff?
Cardiff council licenses HMOs in its area. Landlords must also register with Rent Smart Wales.
Other HMO services in Cardiff
- Damp, mould and HHSRS repairs in Cardiff
- Full HMO refurbishment in Cardiff
- Commercial and above-shop to HMO in Cardiff
- Rewires and EICR remedials in Cardiff
- Professional and co-living HMO refurbs in Cardiff
- Loft conversions for extra rooms in Cardiff
- Licence condition and schedule-of-works in Cardiff
- Sound insulation in Cardiff