Guaranteed EPC C Compliance | Thermova

“Thermova’s EPC C compliance service has been a practical solution for a number of our landlord clients. The process is straightforward, the no-result-no-charge model is an easy conversation to have with portfolio owners, and the results speak for themselves.”

Harris & Co Estates · Fleetwood’s award-winning estate agent since 1995

EPC C Compliance Service

Guaranteed EPC C Rating.
Or pay nothing at all.

A technical route to 2030 compliance for D-band rental properties. No expensive retrofits. No tenant disruption. If we do not achieve a C rating, there is no charge.

£500 per property · No VAT · No charge if we don't achieve a C
Book a portfolio review How it works
The Compliance Problem

By 2030, every rented home must reach EPC C.

Most landlords assume the answer is expensive. New boilers. External wall insulation. Heat pumps. Thousands of pounds per property.

Thousands of existing EPCs carry ratings lower than the true performance of the building warrants, because the assessment methodology was forced to assume worst-case values for anything that could not be physically verified.

In many cases, those assumptions are wrong.

Oct 2030
Deadline for all private rented properties to reach EPC C in England and Wales.
D63 to D68
The SAP band where a verified air permeability test typically unlocks a C rating without physical works.
Zero Risk
No result, no charge. If we do not achieve a C, there is no fee.
How It Works

One test. One certificate. One corrected EPC.

Under RdSAP 10 (active since 15 June 2025), a verified air permeability result can replace the default assumed figure used by the national EPC methodology. For well-maintained older properties, that single change is often enough to shift the rating from D to C.

1

Pulse Air Permeability Test

Carried out by an ATTMA Level 1 accredited operator. Non-invasive, takes a few hours, can be done while the property is occupied.

2

Formal Certificate Issued

The verified test result is documented and passed to a qualified Domestic Energy Assessor as evidence for the new assessment.

3

Corrected EPC Lodged

The DEA inputs the verified figure into RdSAP 10 and lodges a new EPC on the national register. The C band rating is then locked in.

Why the Window Matters

The rules are about to tighten. A C rating achieved now is locked in.

The government's new Home Energy Model (HEM) is set to replace RdSAP for existing homes in the second half of 2027. Under HEM, assumed values will no longer be permitted. Every element of a property's performance will need to be physically evidenced.

Landlords who secure a C rated EPC under the current methodology keep it. The certificate remains valid for its full term. Those who delay will face a far more stringent and expensive route to compliance.

Compliance Timeline
Now
RdSAP 10 in force. Verified air permeability testing permitted as evidence.
H2 2027
HEM replaces RdSAP for existing homes. Defaults scrapped. Full physical evidence required.
Oct 2030
All private rented properties must hold an EPC rated C or above.
Why Thermova

Combined technical expertise under one roof.

We are happy to work through your portfolio property by property, identify the ones that qualify, and deliver the test, the certificate and the lodged EPC end to end. You deal with one point of contact, not four.

✓
ATTMA Level 1 Accredited Certified to carry out air permeability testing under the current accreditation framework.
✓
Domestic Energy Assessor Partner Qualified DEA on hand to input verified results and lodge corrected EPCs on the national register.
✓
Pulse Test Equipment Own access to Pulse testing kit. No waiting for third-party availability, no subcontracting delays.
✓
Portfolio Screening We review existing EPC data before attending to identify properties where the test is likely to deliver a C band outcome.
🛡

No result. No charge.

If we do not achieve a C band EPC rating on any given property, there is no charge whatsoever. Not a reduced charge. No charge at all. The risk sits entirely with us.

£500 per property · No VAT.
Frequently Asked Questions

Everything you need to know before you call.

How much does it cost?
£500 per property. Payable only if we achieve a C band rating. If the test does not lift the property into C, there is no charge.
What happens if you don't achieve a C?
You pay nothing. No call-out fee, no reduced charge, nothing. The commercial risk sits entirely with us, which is why we screen properties before attending to make sure they are strong candidates.
How do I know if my property qualifies?
The strongest candidates currently sit between D63 and D68 on their existing EPC. Send us a list of addresses and we will check the register, identify the properties where a verified air test is most likely to deliver a C, and only quote on those.
How long does the test take?
Around two to three hours on site. The property can be occupied throughout and the tenant does not need to leave.
Will the tenant be disturbed?
No. The Pulse test is low pressure and non-invasive. There is no drilling, no residue, and no change to the fabric of the property.
How long until the new EPC is issued?
Usually within five to ten working days of the test. The verified air permeability result is passed to a qualified Domestic Energy Assessor who carries out a fresh RdSAP 10 assessment and lodges it on the national register.
Is the new EPC legally valid?
Yes. RdSAP 10 became the mandatory methodology for existing dwelling assessments on 15 June 2025 and specifically permits a verified air permeability test result to replace the default assumed figure. The new EPC is lodged on the national register in exactly the same way as any other.
How is this different from just commissioning a new EPC?
A standard EPC uses the worst-case assumed air permeability for the age of the property. We replace that assumption with a measured figure. Where the building is tighter than the default — which it usually is on well-maintained older properties — the SAP score increases and the rating improves.
Why not just wait for HEM?
HEM replaces RdSAP for existing homes in the second half of 2027. Under HEM, assumed values are no longer permitted and every element must be physically evidenced to a higher standard. A C rating achieved now under RdSAP 10 remains valid for its full ten-year term, locking compliance in under the easier methodology.
Does it work on flats?
In most cases, yes. The test is carried out on a single flat as a standalone dwelling and the same principle applies: replacing the assumed figure with a measured one.
What if the property has no current EPC?
Not a problem. We carry out the air permeability test and arrange for a fresh RdSAP 10 EPC to be issued from scratch with the verified result built in.
Do you work with social housing providers?
Yes. The same RdSAP 10 methodology applies to social housing stock and the 2030 minimum EPC C standard is expected to apply to both tenures. We work through any portfolio, private or social, on the same terms.
Get in Touch

Let's review your portfolio.

A ten minute conversation is usually enough to identify which properties are strong candidates. No cost, no obligation.

+44 7976 015890 info@thermova.uk

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