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Install an air source heat pump.
ASHP installed under the BUS scheme — £7,500 grant plus install cost from £8,500.
✓ Updated May 2026✓ Free quotes✓ Vetted pros
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Undersized installer
Cheap quotes skip heat loss calc. Underperforms.
Radiator surprise
60-70% of installs need radiator upgrades.
Grant claw-back
If installer not MCS-certified at install time.
Outdoor unit noise
Permitted Development limits noise. Position matters.
Costs & timeline
Know what it costs. Know when it ends.
Indicative UK ranges and what affects price.
Cost range
By job type
Inc. VAT · 2026
Source: NMT quotes
Source: NMT quotes
Small home ASHP (5-7kW)1-2 bed
£10k–£14k
Medium home ASHP (8-12kW)3-4 bed
£12k–£18k
Large home ASHP (14-16kW)5+ bed
£14k–£22k
Radiator upgradesLarger surfaces
£500–£3k
Net cost after grantMost common
£3k–£10.5k
!
Quote spread is typically ± 18% — always get 3 quotes.
At a glance
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Air source heat pumps deliver UK home heating with 3-4x efficiency vs gas boilers. Average cost: £4,500–£10,500 after the £7,500 Boiler Upgrade Scheme (BUS) grant. 60,000+ MCS installs UK 2025 (+34% YoY). Only 5,471 certified contractors — book early.
What Does the Work Involve?
MCS-certified installer surveys property. Heat loss calculation (MCS 3005). ASHP outdoor unit sized 5-16kW. New hot water cylinder. Radiator upgrades for low flow temp. Underfloor heating optional. Wiring centre and controls. Commissioning. MCS certificate + EPC re-assessment.
Typical Costs
| Item | Low (£) | High (£) | Notes |
|---|---|---|---|
| Small home ASHP (5-7kW) | 10,000 | 14,000 | 1-2 bed |
| Medium home ASHP (8-12kW) | 12,000 | 18,000 | 3-4 bed |
| Large home ASHP (14-16kW) | 14,000 | 22,000 | 5+ bed |
| BUS grant (mains gas) | -7,500 | -7,500 | Standard |
| BUS grant (oil/LPG Jul 2026-Mar 2027) | -9,000 | -9,000 | Temporary uplift |
| Radiator upgrades | 500 | 3,000 | Larger surfaces |
| Net cost after grant | 3,000 | 10,500 | Most common |
How Long Does It Take?
Install: 2-5 days. Survey to commissioning: 6-12 weeks.
UK Regulations
MCS 3005 sizing standard. PAS 2030/2035 installer. BUS grant via Ofgem. Permitted Development for outdoor unit (size limits). MCS certificate for EPC.
Common Problems
- Undersized installer: Cheap quotes skip heat loss calc. Underperforms.
- Radiator surprise: 60-70% of installs need radiator upgrades.
- Grant claw-back: If installer not MCS-certified at install time.
- Outdoor unit noise: Permitted Development limits noise. Position matters.
Frequently Asked Questions
Average cost after BUS grant?
Most UK installs net £3,000-£8,000 after £7,500 grant. Oil/LPG conversions Jul 2026-Mar 2027 get £9,000 grant.
Will I need radiator upgrades?
60-70% of installs do. ASHPs work better at 35-45°C flow temp vs 70°C gas. Larger radiators needed.
Running cost vs gas?
Slightly higher per kWh but 3-4x efficient. Annual £800-£1,800 ASHP vs £900-£2,200 gas. Pays back over decade.
Outdoor unit noise?
Modern ASHPs 40-50dB. Permitted Development limits position 1m from boundary. Quieter than fridge.
Best UK brands?
Daikin, Mitsubishi Ecodan, Vaillant aroTHERM, Samsung, NIBE. MCS-approved range.
How long ASHP lasts?
15-20 years quality. Annual service recommended. Compressor warranty 7-10 years typical.
This guide was written with AI assistance and is intended for general information only. Prices are estimates based on UK averages and may vary by region. Always get at least three quotes and consult a qualified professional before starting any work.
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