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. Rented homes must meet a minimum EPC rating, and works are best planned with the next refurbishment so they are not done twice.
What do EPC and energy upgrades include?
- Review of the EPC recommendations
- Loft and roof insulation
- Internal or external wall insulation
- Heating, hot water and smart controls
- Double or secondary glazing
- Ventilation to control condensation
- LED lighting
- A post-works EPC through your assessor
When do landlords need it?
- An EPC below the required minimum
- High bills in an all-inclusive rent
- Planning ahead for higher standards
What rules apply in each UK nation?
The law differs between England, Wales, Scotland and Northern Ireland, and councils publish their own HMO standards on top. These are the points that usually matter for this work.
England
- Rented homes must currently meet at least EPC E, with a £3,500 spending cap. The government plans EPC C by October 2030, subject to legislation.
- Councils assess hazards, including damp, mould and fire, under the HHSRS; revised regulations and guidance applied from 23 June 2026.
- Building regulations cover structural changes, new partitions, ensuite drainage, fire-resisting construction and notifiable electrical work.
- Councils can fine up to £7,000 where a Category 1 hazard is not removed when it reasonably could have been.
Wales
- 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.
Scotland
- Check current Scottish Government guidance on energy efficiency standards for private rented homes before planning upgrades.
- Awaab’s Law applies to most private tenancies from 6 October 2026: damp and mould reports must be investigated within 10 working days, and repairs to substantial damp or mould must start within 5 working days.
- A building warrant may be needed for a change of use or for installing a fire alarm system; check with the council’s building standards service.
Northern Ireland
- Check current Department for Communities guidance on energy standards for privately rented homes.
- Licence conditions and council enforcement cover disrepair, damp and mould in licensed HMOs.
- New HMOs need building control approval as well as planning permission.
All HMO rules for Northern Ireland
How much do EPC and energy upgrades cost?
| Item | UK typical | Per |
|---|---|---|
| Loft insulation, whole house | £650 – £1,250 | house |
| Internal wall insulation | £60 – £100 | m² of wall |
Typical time on site: 2–15 working days. Your fixed price follows a site visit; use the guide-price tool for a figure for your house.
How the job runs
- Free site visit and measured survey.
- Itemised written quote and programme.
- Works with one point of contact and photo updates.
- Handover with certificates, drawings and photos.
Questions about EPC and energy upgrades
What EPC does a rented HMO need?
In England and Wales most lets must currently reach at least EPC E, and the government plans EPC C in England by 2030, subject to legislation. How an HMO is let can affect how the EPC rules apply, so check the current guidance for your property.
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.
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.
Related services
- Damp, mould and HHSRS repairs
- Full HMO refurbishment
- Commercial and above-shop to HMO
- Rewires and EICR remedials
- Professional and co-living HMO refurbs
- Loft conversions for extra rooms
Where we work
Choose a nation and area for local rules, postcodes and regional prices.
England
- Bedfordshire
- Berkshire
- Bristol
- Buckinghamshire
- Cambridgeshire
- Cheshire
- Cornwall
- County Durham
- Cumbria
- Derbyshire
- Devon
- Dorset
- East Riding of Yorkshire
- East Sussex
- Essex
- Gloucestershire
- Greater London
- Greater Manchester
- Hampshire
- Herefordshire
- Hertfordshire
- Isle of Wight
- Kent
- Lancashire
- Leicestershire
- Lincolnshire
- Merseyside
- Norfolk
- North Yorkshire
- Northamptonshire
- Northumberland
- Nottinghamshire
- Oxfordshire
- Rutland
- Shropshire
- Somerset
- South Yorkshire
- Staffordshire
- Suffolk
- Surrey
- Tyne and Wear
- Warwickshire
- West Midlands
- West Sussex
- West Yorkshire
- Wiltshire
- Worcestershire
Wales
- Blaenau Gwent
- Bridgend
- Caerphilly
- Cardiff
- Carmarthenshire
- Ceredigion
- Conwy
- Denbighshire
- Flintshire
- Gwynedd
- Isle of Anglesey
- Merthyr Tydfil
- Monmouthshire
- Neath Port Talbot
- Newport
- Pembrokeshire
- Powys
- Rhondda Cynon Taf
- Swansea
- Torfaen
- Vale of Glamorgan
- Wrexham
Scotland
- Aberdeen City
- Aberdeenshire
- Angus
- Argyll and Bute
- City of Edinburgh
- Clackmannanshire
- Dumfries and Galloway
- Dundee City
- East Ayrshire
- East Dunbartonshire
- East Lothian
- East Renfrewshire
- Falkirk
- Fife
- Glasgow City
- Highland
- Inverclyde
- Midlothian
- Moray
- Na h-Eileanan Siar
- North Ayrshire
- North Lanarkshire
- Orkney Islands
- Perth and Kinross
- Renfrewshire
- Scottish Borders
- Shetland Islands
- South Ayrshire
- South Lanarkshire
- Stirling
- West Dunbartonshire
- West Lothian