A full heat pump installation typically takes 2 to 5 days, with the total project spanning 4 to 12 weeks from survey to sign-off.
The on-site installation phase for an air source heat pump averages 2 to 5 days for a standard UK home, according to the Energy Systems Catapult’s Electrification of Heat Demonstration Project (Energy Systems Catapult, 2024 data published 2025). Ground source systems add 1 to 3 days for trench or borehole work. The full timeline, from initial enquiry, through home survey, to final commissioning, usually runs 4 to 12 weeks, depending on installer availability and any required grid upgrades. Most of the “waiting” time is not for the physical install but for the pre-installation survey, structural checks, and any necessary electrical or plumbing alterations.
A heat pump installation typically takes 2 to 5 days on-site, with the full project from survey to sign-off spanning 4 to 12 weeks. The pre-installation survey and any required insulation upgrades account for most of the waiting time.
- On-site heat pump install takes 2 to 5 days for a standard UK home.
- Full project from survey to sign-off spans 4 to 12 weeks.
- Pre-installation survey takes 2 to 6 weeks to complete.
- Ground source systems add 1 to 3 days for trench or borehole work.
- Poor insulation can add 2 to 4 weeks to your timeline.
- A full heat pump installation typically takes 2 to 5 days, with the total project spanning 4 to 12 weeks from survey to sign-off.
- The pre-installation survey takes 2 to 6 weeks and determines whether your home is suitable.
- The on-site installation process has four clear stages outdoor unit, indoor unit, pipework, and commissioning.
- Quick numbers average timeline for each stage of a heat pump project.
- The direct answer to "How long does a heat pump installation take?" is 2 to 5 on-site days, but the full project is 4 to 12 weeks.
- You must use an MCS-certified installer to qualify for government grants and to ensure a correct timeline.
- After installation, the system takes 1 to 2 days to reach full efficiency and requires a commissioning report.
- Delays most commonly come from grid capacity checks, structural modifications, and planning permission.
The pre-installation survey takes 2 to 6 weeks and determines whether your home is suitable.
An MCS-certified installer must conduct a detailed heat loss calculation (using MCS 020 or similar) to size the heat pump correctly. This visit takes 1 to 3 hours. The surveyor checks your property’s insulation levels, existing radiator system, hot water cylinder space, and external location for the outdoor unit. If the survey reveals poor insulation, such as no loft insulation or single-glazed windows, you may need to upgrade before installation, adding 2 to 4 weeks to the timeline (MCS installation standards).
The on-site installation process has four clear stages outdoor unit, indoor unit, pipework, and commissioning.
Day 1: The installer positions the outdoor unit on a concrete base or wall bracket, connects refrigerant pipework, and runs electrical cables. Day 2: The indoor unit (hydrobox or hot water cylinder) is installed, usually in an airing cupboard or utility room. Pipework is connected to your existing heating system. Days 3 to 4: The system is filled with water and refrigerant, pressure-tested, and the control system (thermostat, programmer) is wired and configured. Day 5 (if needed): Final commissioning, including checking flow temperatures, refrigerant charge, and system efficiency. The installer provides a handover guide (Energy Saving Trust heat pump installation guide, 2024).
Quick numbers average timeline for each stage of a heat pump project.
| Stage | Typical duration | Key activity | Who is responsible |
|---|---|---|---|
| Initial enquiry | 1 to 2 weeks | Request quotes, compare installers | Homeowner |
| Home survey | 1 to 3 hours (visit), 2 to 6 weeks (scheduling) | Heat loss calculation, insulation check | MCS-certified installer |
| Insulation upgrades (if needed) | 2 to 4 weeks | Loft insulation, cavity wall fill, double glazing | Homeowner / contractor |
| Grid connection (if needed) | 2 to 6 weeks | DNO approval, fuse board upgrade | Distribution Network Operator |
| On-site installation | 2 to 5 days | Outdoor unit, indoor unit, pipework, controls | MCS-certified installer |
| Commissioning and handover | 1 to 2 days | System test, user guide, certificate | MCS-certified installer |
Source: Energy Systems Catapult data; MCS installer survey (2025).
The direct answer to “How long does a heat pump installation take?” is 2 to 5 on-site days, but the full project is 4 to 12 weeks.
The on-site work is the shortest part. The longest part is the pre-installation survey and any required home energy efficiency improvements. For a straightforward semi-detached or terraced house with good insulation and no grid issues, the entire process can be completed in 4 to 6 weeks (Energy Saving Trust). For a larger detached home needing a ground source system or a grid connection upgrade, the timeline can stretch to 10 to 12 weeks. How to prepare your home for a heat pump survey
You must use an MCS-certified installer to qualify for government grants and to ensure a correct timeline.
The Boiler Upgrade Scheme (BUS) in England and Wales requires the installer to be MCS-certified (or equivalent) for you to receive the £7,500 grant (GOV.UK, Boiler Upgrade Scheme guidance, 2026). In Scotland, the Home Energy Scotland loan/grant also requires MCS certification. MCS certification guarantees the installer follows a standardised survey, installation, and commissioning process, which directly affects the timeline. Check the MCS installer database or ask for an MCS certificate number. Also verify TrustMark registration for consumer protection.
After installation, the system takes 1 to 2 days to reach full efficiency and requires a commissioning report.
The heat pump will run a “commissioning cycle” for 12 to 24 hours, gradually bringing the house to temperature. You may notice slightly longer warm-up times on the first day. The installer must leave you with a commissioning certificate, which includes the system’s design conditions, flow temperatures, and refrigerant charge. This document is essential for warranty and grant claims (MIS 3005). You should also receive a user manual and a handover checklist, including how to adjust the thermostat and use the app (if applicable).
Delays most commonly come from grid capacity checks, structural modifications, and planning permission.
If your property has an older fuse board or requires a new electricity supply, you may need to wait 2 to 6 weeks for the Distribution Network Operator (DNO) to approve or upgrade the connection (Ofgem). Structural modifications, such as installing a concrete base for the outdoor unit or reinforcing a wall for a ground source heat pump, can add 1 to 3 weeks. Planning permission is rarely needed for air source heat pumps (permitted development in most UK nations), but listed buildings or conservation areas can add 8 to 12 weeks for a formal application (GOV.UK planning portal). Heat pump grants and funding options in 2026
Frequently Asked Questions
On-site installation takes 2 to 5 days for an air source heat pump, according to the Energy Systems Catapult's Electrification of Heat Demonstration Project. Ground source systems add 1 to 3 days for trench or borehole work.
The full project from initial enquiry to final commissioning typically runs 4 to 12 weeks, per MCS installation standards. Most of this time is for the pre-installation survey, structural checks, and any electrical or plumbing upgrades.
The pre-installation survey takes 2 to 6 weeks and includes a detailed heat loss calculation by an MCS-certified installer. The survey itself lasts 1 to 3 hours on-site.
Poor insulation, such as no loft insulation or single-glazed windows, can add 2 to 4 weeks to your timeline, according to MCS installation standards. Grid upgrades or installer availability may also cause delays.
The on-site installation has four clear stages: outdoor unit positioning, indoor unit and pipework installation, system pressure testing, and final commissioning. Each stage typically takes one day.
