Big Changes to Heat Pump Rules in England: What It Means for Homeowners Considering Installation

The UK government is making it easier for households to transition to renewable heating — and the next big step arrives on 29 May, when new planning regulations come into force that will simplify air source heat pump installation across England.

These changes, part of the government’s Warm Homes Plan, are designed to remove unnecessary red tape and encourage more households to adopt low-carbon heating systems. If you’re thinking about upgrading your boiler or exploring more energy-efficient alternatives, these new rules could make installation faster, cheaper, and easier than ever before.

At Pleasant Plumbers, we install heat pumps across London and regularly guide homeowners through planning, compliance, and grant funding. Here's what the new rules mean — and how they might affect your decision.

Previously, under permitted development, no heat pump could be installed within one metre of the boundary of your property. This was particularly limiting in dense urban areas like London, where outdoor space is tight.

Now: This restriction is being removed — making heat pump installation far more feasible for homeowners with smaller gardens, side access points, or limited rear space.

The maximum allowable size of an air source heat pump is increasing from 0.6 cubic metres to 1.5 cubic metres. Why does this matter?

• Larger units = more powerful systems
• Greater efficiency for larger homes
• Easier specification for modern equipment
• Fewer limitations on manufacturer options

This change is especially beneficial for family homes and larger properties, where more powerful systems are required.

Previously, you were only allowed one air source heat pump under permitted development rules. But from 29 May, you can install up to two heat pumps — ideal for cascade systems, which use multiple units to supply higher-demand homes.

This is a game-changer for larger detached homes, allowing homeowners to use dual-unit systems without applying for planning permission.

Until now, air-to-air heat pumps (which can provide both heating and cooling) didn’t benefit from the same permitted development rules as air-to-water systems.

Under the new rules, air-to-air systems are now permitted development, meaning homeowners who want the added benefit of cooling — particularly useful in heatwaves or warmer flats — can install them with fewer restrictions.

No planning permission means fewer delays, no paperwork, and quicker project timelines — especially for properties not in conservation areas.

London homes with smaller gardens or tight side access can now have a heat pump installed without worrying about breaching boundary limits

With larger allowable unit sizes and the ability to install two units, more households can take advantage of high-capacity, ultra-efficient systems.

Yes — and not just in planning costs.

Pair this with the Boiler Upgrade Scheme, which offers up to £7,500 off the cost of an air source heat pump, and you could install a full system for the same or less than a new gas boiler.

At Pleasant Plumbers, we manage the grant application on your behalf and help ensure your system is compliant, efficient, and future-proof.

If you’ve been on the fence about switching to a renewable heating system, these new planning rules remove key barriers.

Speak to our expert team today for a free, no-obligation site survey and honest advice on whether your home is suitable for an air source heat pump.

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