Heat Pump Guide
How Long Does Heat Pump Installation Take?
Updated 6 June 2026 · 5 min read · By Northants Heat Pumps
The full timeline, stage by stage
The on-site install is the short part. Here is what the whole journey looks like and roughly how long each stage takes.
Stage 1: Survey (week 1)
The installer visits and carries out a heat loss survey of every room. This usually takes a couple of hours. It is the foundation of a good installation, so a reputable installer never skips or shortcuts it.
Stage 2: Design and quote (within a few days)
Using the survey data the installer designs the system and sends a fixed quote showing the grant deduction. You have time to review it and ask questions.
Stage 3: Grant application and ordering (1 to 3 weeks)
Once you go ahead, the installer submits your Boiler Upgrade Scheme application and orders the equipment. This is usually the longest stage and runs in the background while you carry on as normal.
Stage 4: Installation (1 to 3 days)
The installer arrives, removes the old boiler, fits the outdoor unit and cylinder, makes any agreed radiator changes and connects the controls. For most homes this is one to two days.
Stage 5: Commissioning and handover (same visit)
The installer fills, tests and balances the system, sets the controls for your property, and walks you through how it works. You receive your MCS certificate and manufacturer warranty registration on completion.
What affects the timeline
- Property size and complexity, which affects on-site days.
- Whether radiators or pipework need upgrading.
- Equipment lead times for specific models.
- Grant processing, which varies but is usually a couple of weeks.
- Whether insulation work is needed first for grant eligibility.
Keeping disruption low
A good installer plans the work so your time without heating and hot water is short, protects your home while working, and tidies up each day. The outdoor unit goes in outside, the cylinder is sited sensibly, and pipework follows existing routes wherever possible. Most homeowners are surprised how unobtrusive it is.
Ready to start the clock?
The fastest way to a firm timeline for your home is a free survey from a local installer. Get matched on our contact page, or read the full installation process first.
Frequently asked questions
How long does it take to install an air source heat pump?
The physical installation usually takes one to three days on site. From the first survey to a fully commissioned system, the end-to-end timeline is typically two to six weeks, with most of that time taken by the survey, system design and grant processing rather than the install itself.
Will my heating be off during installation?
Only briefly. Your existing heating runs until the changeover, and the period without heating is usually limited to part of the installation. Installers plan the work to minimise time without hot water and heating, and the new system is commissioned before they leave.
How much disruption is involved?
Less than people expect. The outdoor unit goes in outside, the cylinder is sited in a utility area, loft or cupboard, and most pipework follows existing routes. Some homes need a few radiators changed. Installers protect floors and furniture and tidy up daily.
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