Heat pumps in Cardiff (CF3): cost + BUS grant

What the EPC data shows for CF3 (Cardiff)

We’ve aggregated the current Energy Performance Certificate band for 14,248 properties in CF3 (Cardiff), drawn live from the GOV.UK EPC Register. The median home in our sample sits at band C, with 45% falling into band C and 28% in band D. Around 34% of homes are at band D or below — the cohort with the most realistic retrofit upside.

The typical CF3 (Cardiff) home

What the EPC data shows beyond the headline rating — useful context for sizing a heat-pump install.

• Floor area: median 83 m² (25th–75th percentile: 64–96 m²). Heat-pump sizing scales roughly with floor area — expect a 5–8 kW unit at the median.
• Current heating cost: median £487/yr (£335– £704 typical range). The number an installer’s running-cost saving projection sits against.
• Mains gas connection: 96% of properties. Most homes are replacing a working gas boiler — the payback case depends heavily on tariff choice + smart scheduling.
• Property type mix: Detached 19%, End-Terrace 16%, Mid-Terrace 20%, Semi-Detached 42%.
• Dominant age band: England and Wales: 1950-1966 (26% of homes). Sets the fabric-first work expected before commissioning.

Does the Boiler Upgrade Scheme apply in CF3 (Cardiff)?

Yes. CF3 (Cardiff) is in Wales, where the Boiler Upgrade Scheme (BUS) pays £7,500 toward an air-source heat pump install. The grant is administered by Ofgem and deducted by the installer at the point of invoice — you never see the cash. To qualify, the property must be owner-occupied or privately rented, have a valid EPC issued in the last 10 years, and have no outstanding loft-or-cavity insulation recommendation on the EPC (unless an exemption is documented). In our sample of CF3 (Cardiff) EPCs the median rating is band C, which means most homes need to clear at least one insulation recommendation before the installer can claim the grant.

Typical install cost in CF3 (Cardiff)

Pre-grant install costs in CF3 (Cardiff) typically run £8,000 to £14,000 for a 5–10 kW air-source unit, in line with UK averages — labour rates in W99999999 sit close to the national mean. After the £7,500 BUS deduction most CF3 (Cardiff)homeowners pay £1,500 to £6,500 out of pocket. The figure within that range that applies to your property depends on three things: heat-loss sizing (set by floor area, fabric and air-tightness), radiator upgrades (most pre-2000s homes need at least one or two changed), and hot-water cylinder provision. An MCS-certified engineer issues the binding quote after a heat-loss calculation per BS EN 12831.

What this means for your home

Whether a heat pump is a good fit for your specific home in CF3 (Cardiff)depends on three factors the EPC alone can’t answer: roof + outdoor space for the external unit, radiator sizing throughout the heating circuit, and your current heating fuel + tariff. Propertoasty’s free pre-survey check combines your address, an EPC pull, the Google Solar API’s roof data, and a floorplan vision analysis to produce an installer-ready report — typically takes about five minutes.

Run a free pre-survey check on your home — installer-ready report, BUS-eligibility verdict, sizing range, and a list of MCS-certified installers covering CF3 (Cardiff).

Typical monthly heating cost in CF3 (Cardiff)

Based on the median CF3 (Cardiff) home in our EPC sample — a semi-detached house around 83 m² — here’s what the two options look like on a like-for-like monthly total. Boiler numbers assume a £3,300 installed cost on 9.9% APR / 5-year finance plus a typical £20/mo service plan. Heat-pump numbers apply the £7,500 Boiler Upgrade Scheme grant and 0% APR / 10-year finance on the net cost of £6,500.

At today’s standard tariffs, that’s about £24/mo cheaper with the heat pump — roughly £288 a year. The gap grows on a dedicated heat-pump tariff (e.g. Octopus Cosy at 15p/kWh) and as gas prices rise relative to electricity across the 10-year finance term.

How CF3 (Cardiff) compares

Compared with the England + Wales average band-D share of roughly 45%, CF3 (Cardiff)’s 28% sits below the national midpoint. Bands E and worse — typical pre-1930s homes without significant retrofit — make up 6% of the local sample, which compares to the E&W average of around 22%.

Related postcode areas near CF3 (Cardiff)

Same postcode area, useful if your property sits on a district boundary or you want to compare the wider area:

• Heat pumps in CF10 (Cardiff)
• Heat pumps in CF11 (Cardiff)
• Heat pumps in CF14 (Cardiff)
• Heat pumps in CF15 (Cardiff)
• Heat pumps in CF23 (Cardiff)
• Heat pumps in CF24 (Cardiff)
• Heat pumps in CF31 (Bridgend)
• Heat pumps in CF32 (Bridgend)

Nearby areas we cover

Adjacent local-authority and postcode areas — useful for comparing across a wider region:

• Heat pumps in Cardiff — local authority
• Heat pumps in Newport — local authority
• Heat pumps in Bristol, City of — local authority
• Heat pumps in Bath and North East Somerset — local authority
• Heat pumps in Swansea — local authority
• Heat pumps in Exeter — local authority
• Heat pumps in Bournemouth, Christchurch and Poole — local authority
• Heat pumps in Oxford — local authority
• Heat pumps in Birmingham — local authority
• Heat pumps in Wolverhampton — local authority

Heat pump cost by property size

Typical heat pump sizes for a home in CF3 (Cardiff), with UK average install costs from government figures. The right-hand column shows what you actually pay after the £7,500 grant is deducted.

These are UK-wide averages — your actual quote will vary with your roof, insulation, and installer. A guide only; your installer’s final quote will differ.

Also in CF3 (Cardiff)

Every service page below is generated from the same local EPC + MCS-installer data as this one — pick whichever matches what you’re researching:

• Solar panels in CF3 (Cardiff): cost + payback — guide + local EPC data.
• MCS heat pump installers in CF3 (Cardiff) — directory, distance-ranked.
• MCS solar panel installers in CF3 (Cardiff) — directory, distance-ranked.