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. Across Caerphilly, the work is planned around Wales’s HMO rules and the standards the local council publishes.
- Nation
- Wales
- Pricing region
- Wales
- Postcode areas
- CF
- Main towns
- Caerphilly, Gelligaer, Blackwood, Bargoed, Nelson (Caerphilly)
What do EPC and energy upgrades in Caerphilly involve?
- Loft and roof insulation
- Internal or external wall insulation
- LED lighting
- A post-works EPC through your assessor
- Double or secondary glazing
- Review of the EPC recommendations
Which rules apply in Caerphilly?
- 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 Caerphilly?
| 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 Caerphilly
Questions about EPC and energy upgrades in Caerphilly
Will insulation cause condensation?
Not if it is designed with ventilation and vapour control. We always pair insulation with suitable ventilation.
Which upgrade gives the best EPC improvement?
It depends on the house. Loft insulation and heating controls are often the cheapest gains; wall insulation and heating systems make larger differences.
Do you carry out EPC and energy upgrades across Caerphilly?
Yes, across the whole of Caerphilly, including Caerphilly, Gelligaer, Blackwood.
Who licenses HMOs in Caerphilly?
Caerphilly council licenses HMOs in its area. Landlords must also register with Rent Smart Wales.
Other HMO services in Caerphilly
- Damp, mould and HHSRS repairs in Caerphilly
- Full HMO refurbishment in Caerphilly
- Commercial and above-shop to HMO in Caerphilly
- Rewires and EICR remedials in Caerphilly
- Professional and co-living HMO refurbs in Caerphilly
- Loft conversions for extra rooms in Caerphilly
- Fire alarm and detection systems in Caerphilly
- Communal kitchen refits in Caerphilly