- Area
- Gloucestershire
- Postcode district
- BS35
- Nation
- England
- Guide price
- From £9,600 inc VAT
- Survey
- Free for installation enquiries
What to know about replacing an oil or LPG boiler with a heat pump in Thornbury
Most homes can run on a heat pump if the system is designed properly, and Thornbury is no different. The key is matching the heat pump and radiators to the home's heat loss.
For homes outside Thornbury reached by a long drive or narrow lane, delivery of the unit and cylinder is planned in advance. Bungalows and detached houses near Thornbury running on LPG can move to a heat pump, with the tank collected by the supplier.
Off-gas homes have a lot to plan when switching to a heat pump: the fuel tank, older walls, rural power supplies and higher heat loss.
- Detached houses and bungalows with garden space for the unit
- Older oil boilers nearing the end of their life
- Rural and village homes off the mains gas grid
What's included
- Network operator notification and electrical connection
- Removal of the oil or LPG boiler and flue
- MCS certificate and grant application in England and Wales where eligible
- Help arranging LPG tank collection with your supplier
- Outdoor unit, heat pump cylinder, controls and radiator changes
Owners across Gloucestershire can have oil tank removal arranged alongside a heat pump installation in Thornbury.
Grants and rules for heat pumps in England
In England the Boiler Upgrade Scheme gives £7,500 towards an air source heat pump (£9,000 if it replaces oil or LPG, from 21 July 2026 to 31 March 2027), and since 28 April 2026 a valid EPC is no longer needed. The grant is applied for by the MCS-certified installer and shown as a deduction on your Thornbury quote.
There is no VAT on installing a heat pump anywhere in the UK until 31 March 2027. In England most houses can have an air source heat pump under permitted development, provided the unit meets the MCS noise and siting standards; the old 1 m boundary limit was removed on 29 May 2025. We flag listed buildings, flats and sensitive conservation-area positions at survey.
Oil and LPG boiler replacement prices in Thornbury
Guide prices for Thornbury and the rest of Gloucestershire are shown below, installed and inc VAT. We publish ranges rather than a single figure because design details move the price, and the written quote after survey fixes it.
| Home | Typical size | Installed guide price | After £9,000 grant |
|---|---|---|---|
| 1–2 bedroom flat or small terrace | 4–5 kW | £9,600–£12,650 | £600–£3,650 |
| 2–3 bedroom terrace or semi | 5–7 kW | £10,600–£13,650 | £1,600–£4,650 |
| 3 bedroom semi or small detached | 6–9 kW | £12,100–£15,650 | £3,100–£6,650 |
| 4 bedroom detached | 8–12 kW | £14,150–£18,200 | £5,150–£9,200 |
| 5+ bedroom or larger older house | 11–16 kW | £16,650–£22,750 | £7,650–£13,750 |
Installed, inc VAT: unit, cylinder, controls, minor pipework and commissioning. The £9,000 Boiler Upgrade Scheme figure applies to oil and LPG replacements in England and Wales installed from 21 July 2026 to 31 March 2027.
How long is the heating season in Thornbury?
Thornbury has about 7 hours 48 minutes of daylight at midwinter and 16 hours 40 minutes at midsummer. That swing matters if you pair a heat pump with solar panels: summer generation can cover much of the hot water, winter generation far less.
The steps for replacing an oil or LPG boiler with a heat pump in Thornbury
- Tell us about your home: postcode, property type and current heating.
- We book a survey in Thornbury; the surveyor measures rooms, windows and radiators and looks at cylinder space.
- The design and quote arrive in writing, including radiator changes and the outdoor unit position.
- On installation days the old system is removed and the new one fitted and filled.
- We commission the heat pump, show you the controls and register the installation.
Replacing an oil or LPG boiler with a heat pump in Thornbury: questions
Do you cover Yate as well as Thornbury?
Yes. We arrange surveys and installation in Yate, which is about 6 miles south-east of Thornbury, and across Gloucestershire.
How long does a heat pump survey take in Thornbury?
A home survey in Thornbury usually takes one to two hours. The surveyor measures every heated room, checks windows, walls and radiators, and looks at where the outdoor unit and cylinder can go.
How long does installation take in Thornbury?
Most installations take 2–4 days on site. Jobs with several radiator changes or new pipework take longer, and your quote for a Thornbury home states the expected time.
How much is the grant for replacing an oil boiler with a heat pump?
In England and Wales, the Boiler Upgrade Scheme grant is £9,000 when an air-to-water heat pump replaces oil or LPG heating, for installations from 21 July 2026 to 31 March 2027. Otherwise the standard £7,500 applies. The installer claims it and deducts it from your quote. Scotland's Home Energy Scotland funding works differently and includes extra for eligible rural homes; Northern Ireland has no dedicated homeowner scheme at present.
Will I need bigger radiators in an older cottage or farmhouse?
Often in some rooms, because thick solid walls and older windows lose more heat, and heat pumps work at lower water temperatures than oil boilers. The survey checks each room. Rooms with high ceilings or large windows are common candidates for a larger radiator. Where swapping radiators is impractical, a high-temperature unit can be considered, with lower efficiency as the trade-off.