London & South-East England

Landlord EPC C Upgrades

One plan and one quote to move a rented home from EPC E or D to C, with the work planned around your tenants.

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PAS 2030:2023 CertifiedTrustMark ApprovedAccredited installers where needed

Is EPC C upgrade right for your home?

Landlords with a D or E rated flat or house who want a single, planned route to C
Victorian and Edwardian terrace flats with solid walls and single glazed sashes
1930s semis with an unfilled cavity or thin loft insulation
Ex-council flats and maisonettes with cold concrete or solid walls
Portfolio landlords who want the same team and the same paperwork across several properties

Landlord EPC C Upgrades: key facts

The legal minimum for a privately rented home in England is currently EPC E. The government has confirmed a target of EPC C by 2030 and has proposed an earlier date for new tenancies; check the current rules before you commit.
Loft insulation, wall insulation, heating controls, glazing and solar are the measures that move an EPC score most.
A flat typically moves from E to C for £3,000 to £9,000; a house for £8,000 to £25,000, depending mainly on the walls.
Insulation, draught proofing and solar are 0% VAT until 31 March 2027; windows, ventilation and electrical work are 20%.
Insulation installed by our own PAS 2030:2023 certified team with a 25-year insurance backed guarantee; solar and windows by accredited certified partners.
A fresh EPC is lodged by a partner accredited assessor when the work is done.

What is EPC C upgrade?

An EPC C upgrade is a package of measures chosen to lift a rented property from its current Energy Performance Certificate band, usually D or E, to band C. The EPC is calculated from the building fabric, heating, hot water, lighting and any renewables, so the quickest route to C is to fix the elements the assessment scores worst. For most London rentals that means the loft, the walls and the heating controls, with glazing or solar where the points are still short.

The current legal minimum for a private rented home in England is EPC E. The government has confirmed a target of EPC C for private rented homes by 2030 and has proposed that new tenancies meet it earlier. The details, including how the EPC itself is scored and any cost cap, are still being settled, so check the current rules for your tenancy before you rely on them. What is not in doubt is that a C rated property is cheaper to heat, easier to let and less likely to bring a damp or mould complaint.

We start with a free heat loss survey and your existing EPC. From that we put together one quote covering every measure, with the VAT rate and the expected EPC effect shown on each line. Our own team installs the insulation, draught proofing and ventilation; solar and windows are installed by accredited, certified partners under our project management. The work is planned around your tenants, and when it is finished a partner accredited assessor lodges the new EPC.

Who does the work

Insulation, draught proofing and ventilation are installed by our own PAS 2030:2023 certified team. Solar, new windows and any electrical or heating work are arranged and project-managed by Stay Warm and installed by accredited, certified installers (MCS for solar, FENSA or CERTASS for windows). The new EPC at the end is lodged by a partner accredited energy assessor.

Landlord EPC C Upgrades cost guide

Indicative 2026 market ranges for London and the South-East. Your fixed quote follows a free survey and shows each measure, its VAT rate and its expected effect on the EPC.

Job type	Indicative cost	Notes
Loft insulation top-up to 270 mm	£400 – £900	Usually the most points per pound
Internal wall insulation, single room	From £1,800	Solid walls where EWI is not possible
External wall insulation, 3-bed semi	£12,000 – £22,000	The largest single step for a solid wall house
Flat, E to C package	£3,000 – £9,000	Loft or wall lining, draught proofing, controls, new EPC
House, E to C package	£8,000 – £25,000	Depends mainly on the wall type

VAT: mixed. Insulation, draught proofing and solar are energy-saving materials charged at 0% VAT until 31 March 2027 (HMRC VAT Notice 708/6); windows, ventilation and electrical work are 20%, and the quote shows the rate on each line.

What an EPC C package can include

Loft insulation top-up, boarding and hatch (own team)

External or internal wall insulation on solid walls (own team)

Draught proofing to windows, doors and floors (own team)

Ventilation upgrades so the insulated home stays dry (own team)

Heating controls, solar PV or new glazing (certified partners)

A new EPC lodged by a partner accredited assessor at the end

How a landlord EPC upgrade works

Free survey and EPC review

We read the existing EPC and its recommendations, survey the property and identify the measures that gain the most points per pound.

One quote for the package

A written quote listing each measure, its VAT rate, its expected EPC effect and the order of work, so you can choose how far to go.

Work planned around tenants

We agree dates and access with you and your tenants, work room by room where the property is occupied, and keep the disruption short.

New EPC and paperwork

A partner accredited assessor lodges the new certificate. You receive the guarantees and the Building Regulation certificate for the insulation.

Free survey & fixed quote

Book a free, no-obligation survey and we will send a clear, fixed written quote. One point of contact from survey to sign-off, and a written guarantee on the work.

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Landlord EPC C Upgrades FAQs

What is the current EPC rule for landlords?

In England a privately rented home must be at least EPC E unless an exemption is registered. The government has confirmed a target of EPC C by 2030 for the private rented sector and has proposed an earlier date for new tenancies, but the final dates, the way the EPC is scored and any cost cap were still being settled at the time of writing. Check the current rules for your tenancy before you rely on them.

Which measures move an EPC the most?

Insulating the loft and walls, then heating and controls, then glazing and solar. On most D and E rated homes the loft and walls do most of the work. We also check what the existing EPC assumed about the house, because an assessor who cannot see the insulation has to record it as absent, and evidence of what is there can change the score on its own.

What does it cost to get a flat from E to C?

Typically £3,000 to £9,000. A Victorian terrace flat usually needs internal wall insulation to one or two exposed walls, draught proofing and heating controls. An ex-council flat with concrete or solid walls is similar. The exact package depends on what the current EPC is scoring lowest.

And a house?

Typically £8,000 to £25,000. A 1930s semi with a loft top-up, wall insulation and controls sits at the lower end; a solid wall house that needs external wall insulation sits at the top. EWI on a 3-bed semi is £12,000 to £22,000 on its own, and it is also the measure that transforms the property.

Can the work be done with tenants in place?

Usually yes. Loft, external wall insulation, draught proofing and solar are done with little disruption inside. Internal wall insulation takes a room out of use for a few days at a time, so we plan it room by room or between tenancies.

Who produces the new EPC?

An accredited domestic energy assessor. Stay Warm does not lodge EPCs itself; we refer you to a partner assessor and pass them the evidence pack, photographs and specifications, so the new certificate reflects the work that was actually done.

Areas we cover

We arrange EPC C upgrade across Greater London, Surrey, Kent and Hertfordshire. See all areas we cover →

Related services

Free Heat Loss Survey Internal Wall Insulation Loft & Roof Insulation Solar Panels Whole House Retrofit

Related guides

In-depth, independent guidance to help you decide.

EPC C by 2030 for landlords Warm Homes: Local Grant in London Insulating an ex-council flat Insulating a Victorian terrace Insulation cost guide London insulation prices 2026

Last reviewed September 2026 by Stay Warm Insulation.

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