How to Price an EPC Survey: Domestic and Commercial Energy Performance Certificate Margins

Quick Answer: A domestic Energy Performance Certificate (EPC) survey prices £55–£120 in 2026, with HMOs and large detached properties at £100–£180. Commercial EPCs (Non-Domestic Energy Performance Certificate, ND-EPC) range from £180 for a small shop to £900+ for a large warehouse or office. Pricing is driven by floor area, building complexity, lodgement fees, and accreditation scheme costs. The Minimum Energy Efficiency Standards (MEES) make EPCs a recurring obligation: rented properties must hold E or above, with a 2030 step-change to C looking likely under the Energy Act 2023 implementing regulations.

Summary

EPCs are a high-volume, low-margin product for accredited assessors, but they're also a recurring entry-point that opens the door to retrofit work, MEES-driven improvement specifications, and Green Deal-style funded measures. A solo Domestic Energy Assessor (DEA) running 4–6 EPCs a day at £75 average gross is netting around £180–£280 per day after lodgement fees, accreditation fees and travel. Commercial assessors (Non-Domestic Energy Assessor, NDEA) work fewer jobs at higher fees, typically 1–2 surveys a day with much more report writing.

The single most important pricing input is the floor area. A 50m² studio flat takes 35–50 minutes on site; a 250m² detached takes 90–120 minutes; a large period property with multiple extensions and conservatories takes 2.5–3 hours. The lodgement to the central register (EPC Register, run by MHCLG via the EPC Open Data programme) is mandatory and costs £1.65–£2.10 per certificate. Accreditation scheme fees (Elmhurst, Stroma, Quidos, Sterling, NES) are around £180–£420 per year for membership plus per-lodgement levies.

The 2025–2030 regulatory pipeline is the key dynamic for the trade. MEES currently requires E or above for residential and non-residential let property. The Energy Act 2023 enables Government to raise this to C — proposed timetable is a 2028 staging post for new tenancies and 2030 for all tenancies, though final regulations remain in consultation. For pricing purposes, this means EPC volumes are likely to spike significantly through 2027–2030 as landlords race to assess pre-improvement.

Key Facts

Quick Reference Table

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Property type Floor area Time on site Total fee 2026
Studio / 1-bed flat 25–50m² 30–45 min £55–£85
2-bed flat 50–80m² 40–60 min £65–£95
2-bed terrace 70–95m² 45–65 min £65–£100
3-bed semi 90–130m² 50–75 min £75–£110
3-bed detached 110–160m² 60–90 min £85–£125
4-bed detached 150–220m² 75–120 min £100–£150
5-bed / large period 220–400m² 90–180 min £130–£280
HMO (per dwelling unit) varies per unit £75–£140 each
Mixed-use (flat + commercial) both reports 90–150 min £150–£280
Small commercial (shop, office <250m²) <250m² 60–120 min £180–£320
Medium commercial (250–1,000m²) per zone 2–4 hours £350–£780
Large commercial (1,000–5,000m²) per zone 4–8 hours £750–£2,200
Industrial warehouse per zone 4–10 hours £680–£3,500

Detailed Guidance

Domestic EPC — RdSAP methodology

Domestic EPCs are produced using Reduced Data Standard Assessment Procedure (RdSAP) — a simplified version of the full SAP used for new build. The assessor visits the property, collects standardised data points, and runs them through RdSAP-accredited software (PEPSyS, Stroma Cert+, Elmhurst Energy Suite).

Data collection on site includes:

The "RdSAP" methodology has been version-controlled since 2005. The current version (RdSAP 10) was rolled out 2024–2025 and represents a significant tightening of assumptions around heat pump performance, fabric heat loss in solid-wall properties, and assumed thermostatic control. Pre-RdSAP-10 EPCs gave many properties artificially favourable scores; post-2025 EPCs of the same property typically score 5–15 points lower.

This is the source of the "my EPC dropped from D to E" complaints common in 2026 — the methodology changed, not the building.

Site visit procedure

A competent DEA structures the visit as:

  1. Arrival, customer briefing, photo evidence start (5–10 min) — explain the process, take photos of front elevation, address verification, postcode confirmation
  2. External walk-around (5–10 min) — wall types, window count, roof inspection from ground, any extensions, garage/outbuildings
  3. Loft access (5–15 min) — insulation thickness measured with a marked rod, type identified, photo evidence
  4. Heating system inspection (10–15 min) — boiler model and age (data plate), cylinder size, controls (programmer, room thermostat, TRVs)
  5. Room-by-room measurement (15–40 min) — perimeter and ceiling height per room, window counts, lighting check
  6. Customer Q&A and exit (5–10 min) — explain timing of report delivery, answer questions

Photos must be retained for at least 5 years as evidence under accreditation scheme rules. Random audits by the scheme provider occur and incomplete evidence packs result in EPC removals from the register.

Office time and lodgement

After the visit:

Common errors found at audit:

Commercial EPC — SBEM methodology

Commercial EPCs use Simplified Building Energy Model (SBEM) — a much more complex methodology than RdSAP. Properties are zoned by activity type (office, retail, kitchen, storage, etc.), each zone is modelled with its own occupancy, lighting, HVAC and ventilation profile, and the whole building is summed.

A small office (single zone) can be done in 60 minutes on site and 90 minutes in the office. A multi-zone retail unit with restaurant and back-of-house can take a full day on site and 2 days writing up. NDEAs are organised in three levels:

Most NDEAs hold Level 3 or 4. Level 5 NDEAs are scarce and command higher fees (£800+ daily rate equivalent) for large complex buildings.

Display Energy Certificates (DECs) and ESOS

In addition to EPCs, two other commercial certifications create work:

These are higher-value, lower-volume products that complement the bread-and-butter EPC work.

MEES and the regulatory pipeline

The Minimum Energy Efficiency Standards (MEES) Regulations 2015 (and Welsh and Scottish equivalents) prohibit landlords from granting new tenancies on properties below an EPC E rating. For existing tenancies, the prohibition came into force April 2020 (residential) and April 2023 (non-residential).

The Energy Act 2023 enables Government to raise the floor. Current consultation positions:

This creates a multi-year EPC volume spike from 2026 through 2030 as landlords assess, plan retrofits, and re-EPC after improvement. For pricing, this means:

PAS 2035 Retrofit Coordinator route

For ECO4, GBIS and other Government-funded retrofit programmes, a PAS 2035-qualified Retrofit Coordinator is required. The Coordinator manages the project end-to-end including pre-retrofit condition survey, design, install supervision and post-install handover.

A DEA wanting to expand into retrofit:

For a DEA already certified, this is the natural progression and opens the funded-retrofit market.

Accreditation scheme — what to compare

Five recognised accreditation schemes for DEAs and NDEAs:

Scheme Annual fee Per-lodgement Notes
Elmhurst Energy £280–£420 £1.95–£2.10 Largest scheme, robust audit
Stroma Certification £220–£380 £1.85–£2.05 Strong commercial NDEA support
Quidos £200–£360 £1.75–£1.95 Competitive fees, good software
Sterling Accreditation £180–£320 £1.70–£1.90 Smaller scheme, friendlier audit
NES (National Energy Services) £240–£380 £1.85–£2.10 Long-established

All schemes give equivalent legal standing. Differences are software, audit style, and customer support. Most DEAs are members of one scheme only; some commercial assessors hold dual membership for the breadth of NDEA software access.

Frequently Asked Questions

How much does an EPC cost in the UK 2026?

For domestic: £55–£120 for typical homes, rising to £100–£180 for large or complex properties (5+ bed, period, multiple extensions). For commercial: £180 for a small shop up to £3,500+ for a large multi-zone office or warehouse. The fee includes the site visit, RdSAP/SBEM modelling, report generation, and lodgement to the EPC Register.

How long does an EPC last?

10 years from date of lodgement, for both domestic and commercial. A new EPC can be commissioned at any time (e.g. after improvement works to evidence a higher rating). The most recent EPC for a property is the active one — older EPCs remain on the register but don't supersede.

Why has my EPC rating dropped from the previous one?

Almost always due to RdSAP methodology updates, not a real fall in performance. RdSAP 10 (rolled out 2024–2025) uses tighter assumptions around solid-wall heat loss, heat pump efficiency, and lighting. The same property assessed pre-RdSAP-10 vs post-RdSAP-10 typically scores 5–15 points lower under the new methodology. The building hasn't got worse — the assessment got more honest.

Do I need a new EPC if I do energy improvements?

Not legally — the existing 10-year EPC remains valid. However, for landlords planning to demonstrate MEES compliance after improvement (e.g. after upgrading insulation or replacing a boiler), a new EPC at the better rating is essential. For homeowners selling the property, a higher rating EPC is worth the £85 fee in marketing terms — a B-rated property attracts attention compared to a D.

Can I be a Domestic Energy Assessor as a side job?

Yes, and many DEAs operate part-time or as an add-on to a related trade (gas engineering, building control surveying, estate agency). Qualification is via City & Guilds 6361-04 or equivalent, typically a 4–8 week distance learning + practical assessment course costing £950–£1,800. Add accreditation scheme membership (£180–£420/year) and software licence (£140–£480/year). Break-even is around 60–80 EPCs per year.

Regulations & Standards