EPC C by 2030 — What London Landlords Need to Do Right Now

The government confirmed in January 2026 that from 1 October 2030, every private rental property in England and Wales must have a minimum Energy Performance Certificate rating of C. This replaces the current minimum of E and represents the biggest shift in rental property standards since the Minimum Energy Efficiency Standards were introduced in 2018.

For landlords with modern properties already rated C or above, this is a minor administrative step. For the majority of London landlords — who own Victorian terraces, Edwardian conversions, and purpose-built 1960s flats with solid walls, single glazing, and inefficient boilers — this is a genuine challenge that requires planning now, not in 2029.

Why now matters, not 2029

The trades who carry out energy efficiency improvements — insulation, glazing, heating system upgrades — are going to face enormous demand as the 2030 deadline approaches. Scaffolding contractors, solid wall insulation specialists, and heat pump engineers are already booking months in advance in some parts of London.

The landlords who move in 2026 and 2027 will get better prices, shorter wait times, and access to quality contractors before the market tightens. Those who wait until 2028 or 2029 will face premium pricing, poor availability, and the genuine risk that they cannot get the work done in time — leaving them with an unlettable property.

There is also a financial argument for acting early. Any money spent on qualifying energy improvements since 1 October 2025 counts toward the £10,000 cost cap that applies from 2030. Every pound you spend now reduces what you will need to demonstrate later.

What the EPC rating system measures

An EPC rates your property's energy efficiency on a scale from A (most efficient, score 92–100) to G (least efficient, score 1–20). The rating is based on the property's construction, heating system, insulation levels, glazing, lighting, and hot water provision, assessed under the Standard Assessment Procedure (SAP).

The current minimum for letting is E (score 39–54). From 2030, the minimum rises to C (score 69–80).

One important complication: the measurement system is changing. The government is replacing SAP with a new Home Energy Model (HEM) system from 2027. Properties that achieve a C rating under the current SAP system before October 2029 can continue to use that certificate. Properties that have not achieved C by October 2029 will need to meet the new HEM criteria — which focus on the fabric of the building and the heating system rather than the overall score.

The practical implication is this: if your property can achieve C under the current system, getting the EPC done before 2027 is advantageous. If it cannot reach C without major work, the choice of when to do that work is less affected by the system change.

The London challenge — solid walls

London's private rented sector is dominated by Victorian and Edwardian housing stock built before 1919. These properties almost universally have solid brick walls with no cavity, which means cavity wall insulation — the cheapest and most impactful energy efficiency improvement — is not applicable.

The alternatives for solid-walled properties are external wall insulation (EWI) or internal wall insulation (IWI). Both are expensive — typically £8,000 to £15,000 for a terraced house — disruptive, and subject to planning restrictions in conservation areas, which cover large parts of inner London.

This is the core of the London problem. A semi-detached house in the Midlands can often reach EPC C through cavity wall insulation, loft insulation, and a boiler upgrade for under £5,000. A Victorian terrace in Hackney or Islington may require solid wall insulation, new double-glazed windows, and a heat pump to reach the same rating — and the total cost can exceed the £10,000 cap.

If your property falls into this category, the exemption route is worth understanding early. You will need to demonstrate that you have spent £10,000 on qualifying improvements without achieving C — and that exemption must be registered before you can legally continue letting.

What improvements have the most impact

For the majority of London rental properties, these are the improvements worth considering in rough order of impact per pound spent:

Loft insulation is the single most cost-effective improvement available. An uninsulated loft loses 25% of a property's heat. Installing 270mm of mineral wool insulation typically costs £300–£500 and can improve an EPC by one or two bands. Every London landlord with an uninsulated loft should do this before anything else.

LED lighting throughout is cheap, quick, and contributes to the EPC score. Replacing all lighting with LED bulbs costs under £200 for most properties and adds small but measurable EPC points.

Boiler replacement from an old G-rated system to a modern A-rated condensing boiler significantly improves the SAP score. An old boiler running at 65–70% efficiency replaced with a modern unit running at 90%+ makes a meaningful difference. Our boiler installation service starts from £2,499.

Thermostatic radiator valves (TRVs) and a smart thermostat add EPC points at low cost and are considered qualifying improvements under the cost cap.

Double glazing replaces single-pane windows and improves both the EPC score and tenant comfort. In conservation areas, you may need to use secondary glazing instead — check with the local planning authority first.

Solid wall insulation (internal or external) is the most expensive single improvement and is only worth pursuing if the above measures alone cannot reach C.

The EPC assessment and what to expect

Getting an EPC assessment done is straightforward. An accredited Domestic Energy Assessor (DEA) visits the property and collects data on the construction, heating, insulation, glazing, and lighting. The visit typically takes 45–90 minutes depending on property size. The certificate is lodged on the national EPC register and emailed to you within 24 hours.

The EPC includes a recommendations report that lists specific improvements, their estimated cost, and the potential energy saving each would generate. This report is your starting point for planning work — use it to identify which improvements will move you from your current rating to C most cost-effectively.

If your property has been significantly improved since the last EPC was issued, getting a fresh assessment done now may already show a C or above rating without any additional work. Improvements like a new boiler, loft insulation, or double glazing all improve the rating — and if they were done after the last EPC, the current certificate will not reflect them.

Book an EPC assessment at /epc/domestic-epc — from £89.99 for a studio apartment, with results registered on the national database within 24 hours.

A realistic timeline for London landlords

The landlords who treat 2030 as a distant problem are making an expensive mistake. Start now, act in order of cost-effectiveness, and document every qualifying expenditure from October 2025 onwards.

Frequently Asked Questions