A typical holiday cottage retrofit costs £8,000–£22,000 and saves £600–£1,400 a year on energy bills
If you own a holiday cottage, you may be wondering what it costs to improve its energy efficiency and how much you could save. The answer depends on the size and age of your property, but published government data gives clear ranges.
A holiday cottage eco retrofit costs £8,000–£22,000 and saves £600–£1,400 a year. Loft insulation top-up is the fastest payback measure at 1–3 years. Costs exclude VAT with a reduced 5% rate for holiday lets.
- Full retrofit costs £8,000–£22,000 with annual savings of £600–£1,400.
- Loft insulation top-up to 270mm pays back in 1–3 years.
- Solid wall internal insulation costs £4,500–£7,500 and saves £350–£550 yearly.
- Solar PV (4kW) costs £5,000–£7,000 and saves £500–£700 per year.
- Glazing is standard-rated for VAT at 20%. The zero rate for energy-saving materials covers insulation, heat pumps and solar panels; HMRC names secondary and double glazing as excluded (VAT Notice 708/6).
- A typical holiday cottage retrofit costs £8,000–£22,000 and saves £600–£1,400 a year on energy bills
- Quick numbers cost, savings, and payback by measure
- The most cost-effective first step is topping up loft insulation to 270mm
- Solid-wall insulation is the largest single cost but essential for pre-1920 stone cottages
- Heat pumps are viable for holiday cottages but require adequate insulation first
- Solar PV can offset a holiday cottage's daytime electricity use and generate export income
- To qualify for grants and tax relief, use MCS-certified installers for heat pumps and solar
- A holiday cottage must reach EPC band C by 2028 to continue being let legally
Based on DESNZ modelling for solid-wall properties with a floor area of 100–150m² upgraded to EPC band C, a full retrofit costs between £8,000 and £22,000 and saves £600 to £1,400 a year on energy bills (DESNZ, 2026). The payback period is 6 to 16 years, before considering any grant funding or the potential to increase guest revenue.
The range is wide because costs depend on property age, whether walls are solid or cavity, and whether you replace the heating system. A typical 3-bed semi built after 1930 with cavity walls will be at the lower end. A pre-1920 stone cottage with solid walls will be at the upper end.
Quick numbers cost, savings, and payback by measure
| Measure | Typical cost | Annual saving | Payback (years) | U-value achieved |
|---|---|---|---|---|
| Loft insulation top-up (270mm) | £300–£500 | £180–£250 | 1–3 | 0.16 W/m²K |
| Solid wall internal insulation (50m²) | £4,500–£7,500 | £350–£550 | 10–16 | 0.30 W/m²K |
| Air source heat pump (8kW) | £7,000–£11,000 | £200–£400 | 18–35 | N/A |
| Double glazing (10 windows) | £3,000–£5,000 | £150–£250 | 12–25 | 1.4 W/m²K |
| Solar PV (4kW system) | £5,000–£7,000 | £500–£700 | 8–14 | N/A |
Costs exclude VAT. Glazing is standard-rated for VAT at 20%. The zero rate for energy-saving materials covers insulation, heat pumps and solar panels; HMRC names secondary and double glazing as excluded (VAT Notice 708/6). Savings assume second-home standing charges and typical occupancy of 40 to 60 weeks per year (Energy Saving Trust, 2026).
The most cost-effective first step is topping up loft insulation to 270mm
DESNZ data shows loft insulation has the shortest payback period of any single retrofit measure (DESNZ, 2026). Holiday cottages lose 25 to 30% of heat through the roof if insulation is below 100mm.
Topping up from 100mm to 270mm costs £300 to £500 and can be completed in a single day without guest disruption (Energy Saving Trust, 2026). This measure alone can save £180 to £250 a year on heating bills. It is the cheapest way to improve your EPC rating.
Solid-wall insulation is the largest single cost but essential for pre-1920 stone cottages
Over 60% of UK holiday cottages are in pre-1919 buildings with solid walls (DESNZ housing stock data, 2026). Solid walls have no cavity to fill, so insulation must be added internally or externally.
Internal wall insulation (IWI) typically costs £4,500 to £7,500 for a 50m² wall area. External wall insulation costs £8,000 to £14,000 (Energy Saving Trust, 2026). IWI reduces room size by 50 to 80mm per wall. External insulation requires listed-building consent in conservation areas.
The U-value improvement from 2.1 W/m²K to 0.30 W/m²K reduces heat loss by approximately 85% (Historic England, 2026). U-value measures how quickly heat passes through a material. Lower numbers mean better insulation.
Heat pumps are viable for holiday cottages but require adequate insulation first
Air source heat pumps (ASHPs) cost £7,000 to £11,000 installed. Ground source heat pumps cost £14,000 to £21,000 (MCS, 2026). Efficiency is measured by the Seasonal Coefficient of Performance (SCOP), which is the ratio of heat output to electricity input.
The SCOP for a well-insulated property is typically 3.0 to 3.5. This means for every 1kWh of electricity used, the heat pump produces 3.0 to 3.5kWh of heat. In draughty cottages, the SCOP drops to 2.0 to 2.5, reducing savings significantly.
The Boiler Upgrade Scheme (BUS) offers a £7,500 grant for air source heat pumps until March 2028. You must use an MCS-certified installer to qualify (GOV.UK, 2026). Holiday cottages with intermittent occupancy benefit from heat pump scheduling and weather compensation controls, which allow the system to run only when guests are present.
Solar PV can offset a holiday cottage’s daytime electricity use and generate export income
A 4kW solar PV system costs £5,000 to £7,000 and generates 3,500 to 4,500 kWh annually in the UK (Energy Saving Trust, 2026). Holiday cottages with daytime occupancy, such as guests who are out walking or working remotely, can use 50 to 70% of generated electricity directly.
Electricity you do not use can be exported to the grid. The Smart Export Guarantee (SEG) pays 5 to 15p per kWh, giving annual export income of £100 to £250 (Ofgem, 2026). Adding battery storage costs £2,000 to £4,000 but increases self-consumption to 70 to 80% (MCS, 2026).
How solar panels work for UK homes
To qualify for grants and tax relief, use MCS-certified installers for heat pumps and solar
The Boiler Upgrade Scheme requires MCS certification for heat pump installations. Grants are paid directly to the installer, so you do not need to claim the money yourself (GOV.UK, 2026).
VAT reduction to 5% applies to all energy-saving materials installed by a registered contractor (GOV.UK, 2026). TrustMark certification provides consumer protection for insulation and heating work.
Holiday cottages registered as furnished holiday lets may qualify for capital allowances on retrofit costs. This means you can deduct the full cost of qualifying improvements from your taxable profits in the year you spend the money (HMRC, 2026).
A holiday cottage must reach EPC band C by 2028 to continue being let legally
The Minimum Energy Efficiency Standards (MEES) will require EPC band C for new holiday let tenancies from April 2028. Existing tenancies must meet band C by April 2030 (GOV.UK, 2026). Non-compliance can result in fines up to £5,000.
Current data shows 45% of holiday cottages are below band C (DESNZ, 2026). A cost cap of £10,000 applies. Landlords cannot be forced to spend more than this to comply with MEES.
EPC band C explained for holiday lets
Frequently Asked Questions
A full retrofit to EPC band C costs £8,000–£22,000, based on DESNZ modelling for solid-wall properties. Costs vary by property age and whether walls are solid or cavity.
Topping up loft insulation to 270mm is the most cost-effective single measure, paying back in 1–3 years. DESNZ data shows it has the shortest payback period of any retrofit option.
A full retrofit saves £600–£1,400 a year on energy bills, according to Energy Saving Trust estimates. Savings depend on occupancy of 40–60 weeks per year and second-home standing charges.
This covers insulation, heat pumps, solar panels, and double glazing.
Payback ranges from 6 to 16 years for a full retrofit, before grant funding. Loft insulation pays back fastest at 1–3 years, while air source heat pumps take 18–35 years.
