The local picture
Home energy in Cardiff
Most homes in Cardiff are on mains gas, but a significant minority rely on electric, oil or LPG heating. Both groups can qualify for support: boiler replacements for gas homes, and heat pump funding for homes off the grid.
That’s about 22,512 of the 165,480 homes in Cardiff — lower than the average for Wales.
Sources: DESNZ, Sub-national estimates of properties not connected to the gas network, 2024 data (published December 2025); DESNZ, Sub-regional fuel poverty data 2026 (2024 data), Low Income Low Energy Efficiency measure.
What’s available
Grants you could get in Cardiff
For most homes in Cardiff, a funded boiler replacement and better insulation make the biggest difference — but we’ll check every scheme you could qualify for.
Eligibility
Who can apply in Cardiff?
- You own your home or rent it privately (with your landlord’s permission)
- Your heating is old, inefficient or not on mains gas — or you have no central heating
- Someone in your household receives a qualifying benefit, or your income or postcode qualifies through local criteria
- For heat pumps: you’re replacing oil, gas, LPG or electric heating (not means-tested)
Not sure? Just ask.
Rules differ between schemes, and some depend on where you live in Cardiff. Apply online or call 0800 246 1797 and we’ll check your postcode.
FAQs
Grant questions in Cardiff
Can I get a free boiler in Cardiff?
Yes — homeowners and private tenants in Cardiff can apply for government-backed funding. Eligibility usually depends on your heating system and household circumstances, such as receiving certain benefits, and in some areas your income or postcode. A quick application tells us what you could be entitled to.
How many homes in Cardiff are off the gas grid?
Around 13.6% of homes in Cardiff — roughly 22,512 properties — aren’t connected to the gas network, lower than the Wales average of 19.5%. These homes can often get extra support, including up to £9,000 towards a heat pump where the Boiler Upgrade Scheme applies.
Can I get a heat pump grant in Cardiff?
Yes. The Boiler Upgrade Scheme gives £7,500 towards an air or ground source heat pump, plus an extra £1,500 until March 2027 for homes heated by oil or LPG with no mains gas connection. It isn’t means-tested.