Getting to EPC C: A Cost-Ordered Guide for Landlords

Most of the rental stock we manage that sits at D is three to eight SAP points short of a C. That is usually two measures, not a whole-house retrofit.

Cheapest points first

1. Loft insulation to 270mm — £350–£600, typically 4–8 points. Always do this first.
2. Low-energy lighting throughout — under £120, 1–3 points. Trivial and frequently overlooked.
3. Hot water cylinder jacket and pipe lagging — under £100, 1–2 points.
4. Heating controls — TRVs, programmer, room stat — £400–£700, 3–5 points.
5. Cavity wall insulation where cavities exist — £500–£1,200, 6–12 points.
6. Boiler replacement — £2,200–£3,200, 5–10 points if replacing a pre-2005 unit.

The Victorian terrace problem

Solid-wall pre-1919 stock has no cavity to fill, which removes the single most cost-effective measure from the table. External wall insulation runs £8,000–£14,000 on a mid-terrace and rarely pays back in rent.

On solid-wall stock, we get to a C through loft, controls, boiler and glazing — or we advise the landlord to sell.

When to sell instead

If a property needs more than roughly £10,000 of work to reach a C and sits below £110,000 in value, the arithmetic usually favours selling into the owner-occupier market, where the requirement does not apply, and redeploying into post-2010 stock.

Get the assessment re-run

Assessors work from defaults where they cannot see evidence. We have moved properties from D to C on paper alone by supplying cavity-fill certificates and boiler documentation the original assessor never saw. Before spending anything, dig out the paperwork and request a reassessment.

We run EPC improvement plans as part of full management, and as a standalone service. Ask us for a property-by-property plan.