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If your heat pump is fairly keeping you warm but at the same time annoying your neighbours, this could be a big problem. As air source heat pumps become the go-to upgrade for energy efficiency in UK homes, one concern keeps buzzing in the background: noise. If you’ve ever wondered, “Is mine too loud?” or “Can I complain about a neighbour’s heat pump?” — you’re not alone.
Whether you’re installing one for the first time or want to stay on good terms with your neighbours, this guide will explain everything you need to know about UK noise laws for air source heat pumps.
What Is the Noise Regulation for Heat Pumps in the UK?
The UK has clear residential air source heat pump regulations for air source heat pumps. According to planning guidelines, a standard air source heat pump installed under permitted development must not exceed 42 decibels (dB) when measured one metre from the neighbour’s nearest habitable room window.
This limit applies during the daytime, typically from 7 am to 11 pm. These residential air source heat pump regulations UK are in place to make sure the equipment doesn’t cause a disturbance, especially in quiet residential areas.
Permitted Development Rights
In the UK, many ASHP installations fall under “Permitted Development Rights,” meaning they don’t require planning permission if certain conditions are met. One crucial condition relates to noise:
Noise Limit: The noise level from the ASHP must not exceed 42 decibels (dB) when measured 1 meter from the nearest neighbor’s window or door.
- The outdoor unit must not exceed 0.6m³.
- Only one heat pump is allowed on the property without permission.
- The unit is not on the front of your house (or visible from the road).
- It must be installed on the ground or a flat roof, not a sloping one.
This limit is in place to ensure that the operation of the heat pump doesn’t cause a nuisance to neighboring properties.
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New UK Rules For Air Source Heat Pumps in 2025
As of May 29, 2025, the UK government has eliminated the installation mandate for air source heat pumps to be placed one meter away from adjacent properties. This new rule is intended to promote heat pump use by streamlining installation regulations.
But it should be noted that whereas the distance restriction has been withdrawn, the sound level limitation is still in force. Homeowners are still required to ensure their ASHPs meet the 42 dB sound restriction.
Air Source Heat Pump Noise at Night
According to the UK government, the noise level of an air source heat pump must not exceed 42 dB at night. In particular, this would mean 37 dB for the heat pump alone, plus a background level of 40 dB nominally. Once the noise rises beyond that, especially in a quiet residential area, it can be termed a nuisance.
Disturbance at night is taken seriously because it can disturb sleep. Councils may investigate and issue enforcement notices if a unit is noisy.
Neighbours and Noisy Air Source Heat Pumps
One of the most common complaints is a noisy air source heat pump from a neighbour. These systems are not supposed to be noisy, but defective equipment, bad positioning, or poor installation can be the cause.
Is It Normal for a Heat Pump to Make a Loud Noise?
Yes, some droning or humming is normal, particularly when the machine turns on or defrosts. Loud banging, high-pitched blubbering, or buzzing is not. These noises can frequently be resolved with a noise evaluation and better installation.
Can I Complain About a Neighbor’s Heat Pump?
Yes, if your neighbour’s ASHP is creating a noise disturbance, you can complain to your local council’s Environmental Health team. The council will make an inquiry into the complaint, which may include:
- Noise Monitoring: Testing the ASHP’s impact of noise to check compliance.
- Assessment of Impact: Assessing the impact of the noise on your quality of life.
Still, the council can contend that the homeowner remedies the situation if the ASHP is set up to exceed acceptable noise situations or constitute a statutory nuisance.
Air Source Heat Pump Noise Assessment
To corroborate compliance with noise norms, a noise assessment might be needed. This assessment determines if the noise emissions of the ASHP are within acceptable limits. Two main methods are applied in the UK:
- MCS 020: This approach presupposes a 40 dB background noise position and offers a simple methodology for determining compliance.
- BS4142: This recommendation uses a more complex analysis, taking into account the nature of the noise and its effects on the surrounding environment.
A noise assessment may identify issues and inform opinions regarding the ASHP position and noise reduction measures.
How to Block Noise from Neighbours’ Heat Pump
There are many things you can do to minimise the noise, if your neighbor’s heat pump is waking you in the middle of the night or disrupting your sleep.
1. Use Sound Barriers
Fences, garden walls, or dense hedges can block and absorb some of the noise. Solid fences constructed of wood or brick are most effective, particularly if they are higher than the heat pump and directly between the source and your land.
2. Add Acoustic Panels
You may add outdoor acoustic panels or soundproof blankets around your side of the fence or wall. These are designed to absorb sound and eliminate echo, very handy if the noise is persistent.
3. Close Gaps in Windows and Walls
Check for any gaps in your windows or doors. Use weatherstrips or sealants to block outside sound from leaking in. Triple glazing can also help if the noise is very persistent.
4. Rearrange Outdoor Spaces
Move seating areas, patios, or garden furniture further away from the noise source, if possible. Even small changes in distance can reduce how loud the sound feels.
5. Speak to Your Neighbour
If the noise is excessive, try having a polite chat. They may not know it’s bothering you. They could move the unit, add a barrier, or service it if something’s wrong.
6. Contact the Council
Still having a problem with the noise and impacting your lifestyle? You can report it to your local council. They’ll conduct a noise survey and could take action if the unit is violating the regulations.
What If Your Heat Pump Is Too Loud?
Already had a unit installed and concerned it’s above the threshold? Here’s what you can do:
1. Call your installer
Tell them to take a reading of the noise level. If it is too high, they can adjust controls, relocate the unit, or recommend soundproofing.
2. Consult a sound engineer
For peace of mind, have an independent check-up. A pro will be able to tell you precisely how loud it is—and where the noise is heading.
3. Talk to your neighbour
If they have complained, speak with them in a calm manner. Inform them that you are on the way to a solution. Most are just looking for reassurance.
The Bottom Line
Homeowners who are thinking about air source heat pumps must understand and comply with the UK’s noise policy regarding them. By choosing the right, having it installed correctly, and being informed of noise scenarios, you will be able to enjoy an ASHP without affecting your neighborly relationships.
However, seek advice from professional experts and your local planning department if you are worried about ASHP noise or require support with compliance.
FAQs
In the UK, air source heat pumps cannot be more than 42 dB at the neighbouring house’s window. This will be the unit’s sound plus the background noise from the surrounding environment.
Yes, 70 dB is genuinely loud for a heat pump. It’s above UK law and might result in a complaint or enforcement by the local council.
The legal limit is 42 dB, 1 metre from your neighbour’s closest window. Exceeding this can break planning regulations and cause problems.
The primary British Standard for testing air source heat pumps is BS EN 14511. This dictates the regulations for determining heating capacity, sound situations, and efficiency.
