How long does a heat pump installation take?
A typical air-source heat pump installation takes two to three days on site once the design work is complete. More complex jobs — especially homes needing radiator upgrades, a new hot-water cylinder position, or significant pipework changes — can take longer. Ground-source systems take longer again because of groundworks.
Most ASHP installs: 2–3 days on site after survey and design.
Expect the full process to be measured in weeks, but the actual installation visit is usually only a few days. The longest parts are often the design, BUS paperwork and any pre-install upgrades rather than the final fit itself.
Typical timeline
| Stage | Timing | What happens |
|---|---|---|
| Home survey + heat-loss calculation | 1–2 hours visit | The installer measures rooms, insulation levels, radiator sizes and hot-water setup, then completes the system design and heat-loss calculation afterwards. |
| Quote, design and grant paperwork | Several days to a few weeks | This includes final design, emitter recommendations and Boiler Upgrade Scheme paperwork where applicable. Timescales vary more here than on installation day itself. |
| Main installation | 2–3 days | Outdoor unit fitted, cylinder installed or replaced, hydraulic connections made, controls set up and system filled and tested. |
| Radiator or pipework upgrades | Extra half day to 2 days if needed | Homes needing multiple larger radiators, pipework changes or cylinder relocation often extend the job beyond the base install window. |
| Commissioning + handover | A few hours | The installer balances the system, sets weather compensation or control strategy, and explains how to run the heat pump efficiently. |
How to prepare
- Clear access around the proposed outdoor unit position and the hot-water cylinder cupboard or airing cupboard.
- Be ready for a short hot-water or heating interruption while the old system is disconnected and the new one is commissioned.
- Ask early whether any radiator upgrades are likely — that is one of the biggest drivers of extra time.
What changes the timescale?
- How many radiators need changing or upsizing.
- Whether a new cylinder position or pipe route is required.
- Whether the home is occupied and needs work phased carefully around daily routine.
- BUS paperwork and installer scheduling lead time before the on-site date.
Common questions
Do I need to move out during a heat pump installation?
No. Most households stay at home during the work. There may be periods without heating or hot water, and access will be needed to key rooms, but a normal domestic retrofit does not usually require you to move out.
What makes a heat pump installation take longer?
The biggest time drivers are radiator upgrades, awkward cylinder locations, limited pipe routes, and homes where access is tight. Ground-source systems also take longer because trenching or borehole work sits outside the normal ASHP timeline.
Is the survey done on the same day as installation?
No. The survey and heat-loss calculation happen before installation. A reputable installer uses that information to size the system correctly and identify any emitter or insulation work needed before the final install date.
How long does it take to get a heat pump quote after the survey?
Often a few working days, but it can take longer for busy installers or more complex homes. The quote stage includes design work, not just a simple price estimate, so it is normal for it to take longer than a standard boiler quote.
Ready to compare installers?
Get local quotes and ask each installer for a realistic timeline based on your home.