How Long Does It Take to Install an Air Source Heat Pump?

Last Updated on July 4, 2025

Are you considering making your home more energy-efficient and eco-friendly? If you’re asking, “How long does it take to install an air source heat pump?”, you’re likely already on the path to lowering your heating bills and reducing your carbon footprint.

For UK homeowners and landlords, timing is crucial, especially if you want to minimise disruption and start saving energy fast. This guide breaks down everything you need to know about installation timelines, key factors that influence the duration, and what to expect during the process.

Whether you’re retrofitting an older property or upgrading a newer build, understanding the timeline helps you plan ahead and get the most out of your investment.

What’s the Typical Timeline for Installing an Air Source Heat Pump in the UK?

Most domestic air source heat pump (ASHP) installations in the UK take 2 to 5 days, depending on the complexity of the system and the property type.

However, installation is more than just the physical setup, it also includes pre-installation surveys, planning, and system testing.

What Factors Affect Air Source Heat Pump Installation Time?

The time it takes can vary based on several important factors. Here’s what UK homeowners and landlords should be aware of:

Property Type and Layout

• Older properties may require pipework adjustments or insulation upgrades.
• Flats or terraced homes with limited outdoor space might need custom solutions.

Heating System Replacement vs. New Build

• Retrofits (replacing a gas boiler with a heat pump) can take longer than new build installations, which are often more straightforward.
• Removing an old combi boiler and reconfiguring the pipework can add 1–2 days.

Cylinder Installation Needs

• If your current setup doesn’t have a hot water cylinder, installing one can extend the timeline.
• Heat pumps work best with low-temperature systems, often requiring larger radiators or underfloor heating, which can increase installation time.

Planning and Permits

• Most ASHPs fall under Permitted Development in England, but exceptions (like listed buildings or conservation areas) may need planning permission, which can delay the process.

Do You Need to Prepare Your Home Before Installation?

Yes, preparation can streamline the installation process and help avoid delays:

• Clear outdoor space for the heat pump unit (usually near an external wall)
• Ensure your electrical system can handle the new load (your installer will advise)
• Discuss insulation upgrades with your installer—well-insulated homes improve efficiency and comfort

Is the Installation Disruptive for Occupants?

In most cases, minimal disruption is expected. Unlike major building works, air source heat pump installation is relatively tidy and quiet.

However:

• Hot water access may be limited during the indoor installation day
• You might experience temporary heating downtime, typically no more than 24 hours
• Most reputable installers work around your schedule to minimise disturbance

Can Commercial Properties Expect Longer Installation Times?

Yes, commercial or multi-unit residential properties typically require more planning and may take up to two weeks, especially if:

• The system involves multiple indoor units
• You’re integrating the heat pump with solar PV or battery storage
• There are custom heating zones or multiple building levels

What Happens After Installation?

Once your air source heat pump is installed, your installer will:

• Test and commission the system
• Provide a handover pack with user instructions
• Register the installation with MCS (Microgeneration Certification Scheme)
• Support you in claiming government incentives like the Boiler Upgrade Scheme

This process ensures your system is eligible for funding and performs efficiently.

How Can You Speed Up the Process?

✅ Book your free pre-installation survey early
✅ Choose a trustworthy, MCS-certified installer
✅ Discuss all aspects upfront—cylinder location, pipework, insulation, and controls
✅ Plan installation during warmer months to reduce impact of heating downtime

How Much Does Air Source Heat Pump Installation Cost in the UK?

While this post focuses on installation time, many homeowners also want to know about costs. For reference:

• Domestic installation typically ranges from £7,000–£13,000
• Government support like the Boiler Upgrade Scheme can reduce this by £7,500

But remember: A faster installation doesn’t always mean a better one. Choose an installer who prioritises quality, compliance, and system efficiency.

Ready to Upgrade? Request Your Free Air Source Heat Pump Quote Today

Thinking about making the switch? Don’t wait.

At Eco Happy, we specialise in quick, compliant, and hassle-free air source heat pump installations across the UK. Our expert team will assess your home, guide you through funding options, and deliver a tailored solution built around your needs.