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01 · Ask
Heat pump, solar, battery or all?
Different priorities, different ROI. Describe the house, the bills and the budget — the AI tells you what stacks up.
Book a PAS 2035 assessment.
Retrofit Coordinator and Assessor — required for ECO4 and large grant-funded retrofits. Whole-house plan.
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Hire a renewables installer. MCS or no grant.
Read the brief on MCS, BUS grants, heat-loss surveys and right-sizing — then let Three local installers quote.
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02 · Read the brief
Walk in informed
BUS £7,500 heat pump grant, SEG export tariffs, MCS certification, EPC requirements, radiator upgrades. Know the rules.
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03 · Compare
Compare 3 installer quotes
Three local installers quote on the same spec — heat-loss, sizing, grants, warranty — so the cheapest isn't accidentally the unfunded.
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Top tips
Hiring a renewable energy, without the regret.
Four moves that separate a smooth job from a nightmare.
Use MCS-certified installers only.
BUS, ECO4, SEG payments all require MCS-certified installation. Any installer without MCS means no grants and no SEG export tariff.
Get a heat-loss survey for heat pumps.
Heat pumps must be properly sized to your house heat loss. Insist on a Heat Loss Calculation (MCS-recognised) — never a 'kW per m²' shortcut.
Check radiator compatibility.
Heat pumps run at lower flow temps (35–55°C vs 70°C for gas). Most existing rads are undersized. Cost: £200–£500 per upgraded rad — get this on the quote.
Don't oversize solar PV.
Generation beyond what you export earns 5–15p/kWh (SEG). Generation you use saves 30p+. Right-sized to consumption beats massive arrays for ROI.
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
Air source heat pump (install)Pre-grant
£8k–£14k
Ground source heat pump
£18k–£35k
Solar PV 4kW system
£6k–£9k
Battery storage (5kWh)
£3.5k–£6.5k
Solar thermal (hot water)
£4k–£7.5k
EV charger (Type 2, 7kW)
£800–£1.5k
!
Quote spread is typically ± 18% — always get 3 quotes.
At a glance
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Retrofit assessor surveys UK home for whole-house energy upgrade plan under PAS 2035:2023. Mandatory for ECO4, BUS, and Warm Homes Plan funding. Expect to pay £400–£1,500 for UK retrofit assessment.
What Does the Work Involve?
TrustMark-registered retrofit assessor visits property. Whole-house survey: insulation, heating, ventilation, moisture risk. Energy modelling. Plans phased works. Identifies fabric-first priorities. Issues Retrofit Coordinator report (PAS 2035 compliant).
Typical Costs
| Item | Low (£) | High (£) | Notes |
|---|---|---|---|
| Retrofit assessment | 400 | 800 | Single property |
| Retrofit Coordinator (oversight) | 500 | 1,500 | Per project |
| Combined assessor + coordinator | 800 | 2,000 | Whole-house package |
| Re-assessment after works | 200 | 500 | Verification |
| EPC + retrofit combined | 300 | 900 | Best value |
| HMO/multi-unit assessment | 800 | 3,000 | Per building |
| Whole-house plan implementation | 15,000 | 80,000 | Plus assessment |
UK Regulations
PAS 2035:2023 mandatory March 2025. TrustMark certification. Required for ECO4 funding, some BUS applications, and Warm Homes Plan from 2027. Retrofit assessor + coordinator + installer triangle.
Frequently Asked Questions
When is retrofit assessment required?
For grant-funded work: yes. For private major retrofit: best practice not mandatory.
Assessor vs coordinator?
Assessor: surveys and plans. Coordinator: oversees installation across multiple trades. PAS 2035 requires both.
How long retrofit project?
Assessment 1-2 weeks. Plan 2-4 weeks. Implementation 3-6 months whole-house typical.
EPC same as retrofit assessment?
No — EPC is standard rating. Retrofit assessment is detailed whole-house upgrade plan.
Cost-effective whole-house?
Fabric-first methodology saves money long-term. Insulation before heat pump.
Best UK accreditation bodies?
TrustMark, Elmhurst Energy, Stroma. PAS 2035 training providers.
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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