And if the property is listed, within a conservation area, a flat or affected by an Article 4 Direction, the position can be very different.

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The safest approach is simple.

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Check what approvals are required before ordering the work.

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Planning Permission and Building Regulations Are Not the Same Thing

 

This is one of the most important things for homeowners to understand.

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Planning permission is mainly concerned with the use, appearance, location and impact of development.

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Building Regulations are concerned with how building work is designed and constructed, including matters such as:

• Structural safety

• Fire safety

• Electrical safety

• Ventilation

• Energy efficiency

• Heating systems

• Glazing

• Drainage

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You can therefore have work that does not require planning permission but still needs to comply with the Building Regulations.

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Government guidance specifically confirms that planning permission and Building Regulations approval are separate systems and that some projects may require both.

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What Is Permitted Development?

 

Permitted development rights allow certain types of work to be carried out without making a conventional planning application.

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Solar panels, some heat pumps and electric vehicle charging equipment can potentially benefit from permitted development rights.

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But permitted development does not mean that anything goes.

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There are still conditions relating to matters such as:

• Position

• Size

• Height

• Appearance

• Number of units

• Location within the property

• Protected areas

• Listed buildings

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If you are uncertain whether your proposal qualifies, your local planning authority can advise you. It is also possible to apply for a Lawful Development Certificate to obtain formal confirmation that planning permission is not required.

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Do Solar Panels Need Planning Permission?

 

Solar panels can often be installed without a full planning application.

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Domestic solar equipment has its own permitted development rights covering installations on houses, blocks of flats and buildings within their grounds.

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The rules were updated again on 27 August 2026, with transitional arrangements running until August 2027. The detailed conditions cover matters including the position and visual impact of the equipment.

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For a straightforward solar installation on an ordinary house, planning permission may therefore not be necessary.

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But particular care is required where the property is:

• Listed

• Within a conservation area

• Within other protected land

• A flat

• Subject to unusual planning restrictions

• Installing equipment in a particularly prominent position

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Do not assume that because your neighbour has solar panels you automatically have the same planning position.

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Do Heat Pumps Need Planning Permission?

 

Many air source heat pumps can now be installed under permitted development rights.

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The rules in England were relaxed in May 2025.

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Among the changes, the government removed the previous general requirement for an air source heat pump to be at least one metre from the property boundary, increased the permitted size for houses and allowed certain systems capable of both heating and cooling to benefit from the right.

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That has made heat pump installation considerably easier for many properties with smaller gardens.

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But permitted development conditions still apply.

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The location of the unit, size, number of units and type of property should therefore be checked before installation.

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What About Ground Source and Water Source Heat Pumps?

 

Ground source and water source heat pumps also have permitted development provisions.

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The planning position can potentially be simpler because much of the equipment is below ground or within a body of water.

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However, these projects can involve significant excavation, boreholes, pipework and access requirements.

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There may also be environmental, drainage or land ownership issues depending upon the particular project.

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The fact that the heat pump itself may qualify as permitted development does not remove the need to consider the rest of the work.

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Does Air Conditioning Need Planning Permission?

 

The answer depends heavily upon the system and where the external equipment is located.

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An internal air conditioning unit is obviously very different from placing several condenser units on the front wall of a period house.

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Some modern air to air heat pumps can benefit from the permitted development rights available to air source heat pumps, provided the relevant conditions are satisfied.

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Where those conditions are not met, planning permission may be required.

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Noise and the effect on neighbouring properties can also be important considerations.

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If you are proposing cooling equipment close to neighbouring windows or boundaries, it is sensible to consider the planning position before purchasing the system.

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Air Conditioning and Building Regulations

 

Planning is not the only consideration.

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Government guidance specifically identifies the installation of a fixed air conditioning system as work that may require Building Regulations approval.

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The installation may involve:

• Electrical work

• Refrigerant pipework

• Drainage

• Penetrations through external walls

• Structural support for external equipment

• Ventilation considerations

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This is another example of an installation that may look simple but still needs to be properly designed and installed.

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Do Replacement Windows Need Building Regulations Approval?

 

Replacement windows and doors can fall within the Building Regulations.

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The regulations deal with matters including energy efficiency, ventilation and safety glazing.

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Government guidance lists replacement windows and doors among alteration works that may require Building Regulations approval.

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In many cases a registered installer can certify the work through an appropriate competent person scheme rather than the homeowner making a separate Building Regulations application.

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The installer should provide the appropriate certification when the work is completed.

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Do New Windows Need Planning Permission?

 

For many ordinary houses, replacing windows with something similar may not require planning permission.

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But this changes when the appearance of the building is being altered significantly or where additional restrictions apply.

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Particular care is needed for:

• Listed buildings

• Conservation areas

• Article 4 areas

• Flats

• Period properties

• Buildings with conditions attached to previous planning approvals

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Changing traditional timber sash windows to modern units, altering opening arrangements or changing frame materials can be much more sensitive on a protected property.

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Planning should therefore be checked before assuming that replacement windows are simply maintenance.

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Does Insulation Need Planning Permission?

 

Much depends upon the type of insulation.

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Adding insulation within a loft is very different from covering the outside of a Victorian house with a new insulated render system.

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Internal insulation usually has little effect on the external appearance of the property.

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External wall insulation can substantially change:

• Wall thickness

• Window reveals

• Roof edges

• Eaves

• External finishes

• Architectural details

• The appearance of the building

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Planning permission may therefore become relevant, particularly on period properties or in conservation areas.

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Building Regulations can also apply depending upon the extent and type of work.

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The insulation itself should never be considered separately from ventilation and moisture management.

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Be Careful When Making a Home More Airtight

 

Insulating walls, improving windows and sealing unwanted draughts can substantially reduce heat loss.

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But the home still needs fresh air.

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The Building Regulations contain specific requirements relating to ventilation, supported by Approved Document F.

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New guidance for ventilation and energy efficiency was published in 2026 as part of the updated Building Regulations standards.

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This is why homeowners should be careful about repeatedly carrying out isolated improvements without considering the whole property.

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A house that was previously naturally draughty may require a much more considered ventilation strategy once it has been substantially insulated and sealed.

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Does MVHR Need Building Regulations Approval?

 

Mechanical ventilation with heat recovery is not simply another appliance.

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A proper system involves ductwork running throughout the property, supply and extract terminals, external penetrations and a central ventilation unit.

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Its performance depends upon the system being designed, installed and commissioned correctly.

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Building Regulations requirements relating to ventilation therefore need to be considered.

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The 2026 Building Regulations guidance specifically highlights the role of competent installation and commissioning for mechanical ventilation systems.

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Trying to add MVHR after a major refurbishment has finished can also be considerably more difficult than planning it before ceilings and walls are closed.

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What About Battery Storage?

 

A small domestic battery located within a suitable garage or utility area will usually present very different planning issues from a large external installation.

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Planning permission may become relevant where external cabinets, enclosures or other structures materially affect the property.

But planning is only part of the consideration.

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Battery installations also involve electrical safety, location, ventilation where required, fire considerations and integration with the home's electrical system.

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The latest Building Regulations guidance specifically addresses the installation and commissioning of onsite electricity storage systems.

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Battery storage should therefore be regarded as part of the home's electrical infrastructure rather than simply another household appliance.

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Do Electric Vehicle Chargers Need Planning Permission?

 

Electric vehicle charging points can benefit from permitted development rights where the relevant conditions are satisfied.

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The government has continued to expand permitted development rights relating to electric vehicle charging infrastructure.

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But the electrical installation still needs to comply with the relevant safety requirements.

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Government guidance confirms that electric vehicle charging installations need to meet electrical safety requirements under the Building Regulations and relevant electrical standards.

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Homes without their own driveway can present additional complications where cables would need to cross a pavement or public highway.

That should be investigated before purchasing the charger.

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What About Underfloor Heating?

 

Underfloor heating itself does not usually present major planning issues where it is entirely internal.

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Building Regulations considerations can be more important.

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The work may involve:

• Electrical installations

• Heating pipework

• Floor construction

• Insulation

• Floor levels

• Structural loading

• Heating controls

• Energy efficiency

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If underfloor heating forms part of a larger refurbishment or extension, it should be designed as part of the overall Building Regulations package rather than added as an afterthought.

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Heating Systems and Building Regulations

 

Government guidance also identifies installing or replacing heating systems as work that can require Building Regulations compliance.

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That can include considerations such as:

• Energy efficiency

• Controls

• Pipe insulation

• Electrical work

• Ventilation

• Hot water storage

• Commissioning

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The updated 2026 guidance specifically addresses heat pump controls, fixed building services and the installation and commissioning of heat pumps.

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Using an appropriately registered installer can often simplify the certification process.

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Listed Buildings Need Special Care

 

Listed buildings are a completely different proposition.

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Work that would be straightforward on an ordinary house may require Listed Building Consent if it affects the special architectural or historic character of the building.

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That could potentially include:

• Solar panels

• Replacement windows

• External insulation

• Heat pump equipment

• New external vents

• Internal insulation

• Major alterations for ventilation systems

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Unauthorised work to a listed building can have serious consequences.

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Do not assume that a green improvement is automatically acceptable simply because it improves energy efficiency.

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The method of carrying out the improvement can be just as important as the improvement itself.

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Conservation Areas and Article 4 Directions

 

Conservation areas can also restrict what can normally be done under permitted development rights.

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An Article 4 Direction can remove particular permitted development rights from certain properties or areas.

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This is especially relevant in London and the Home Counties, where many period residential areas are protected.

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A proposal that would be permitted development on one street may require planning permission a short distance away.

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Always check the planning history and local restrictions for the actual property.

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Flats Need Particular Attention

 

Homeowners living in flats should be especially careful about assuming that normal householder permitted development rights apply.

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Government guidance confirms that the familiar householder permitted development rights applying to many alterations to houses do not automatically apply to flats.

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There can also be another layer of approval.

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The lease may require consent from:

• The freeholder

• Management company

• Landlord

• Other leaseholders

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This can be particularly important for solar panels, heat pumps, external condenser units, replacement windows and equipment attached to shared walls or roofs.

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Planning permission is not the same as permission under the lease.

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You may need both.

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Building Regulations Approval May Be Handled by the Installer

 

Not every project requires the homeowner to submit a Building Regulations application personally.

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Certain types of work can be carried out by contractors registered with recognised competent person schemes.

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The contractor can certify compliant work and notify Building Control.

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Government guidance confirms that where an appropriate registered competent person is used, a separate application by the homeowner may not be necessary.

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Always ask the installer:

Who is responsible for Building Regulations compliance and what certification will I receive when the work is finished?

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Do not wait until the property is being sold to discover that the paperwork is missing.

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Get the Approvals Right Before Work Starts

 

The worst time to investigate planning permission is after the equipment has been installed.

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Before ordering major green home improvements, establish:

• Whether planning permission is required

• Whether permitted development applies

• Whether a Lawful Development Certificate would be sensible

• Whether the property is listed

• Whether it is in a conservation area

• Whether an Article 4 Direction applies

• Whether Building Regulations approval is required

• Whether the installer can self certify the work

• Whether freeholder consent is necessary

• Whether structural work is involved

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It is far easier to resolve these questions before installation than afterwards.

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Green Technology Still Needs Good Design

 

Solar panels, heat pumps and insulation may be green technologies, but they are still alterations to a building.

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They need to work with the property.

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A poorly positioned heat pump can create unnecessary planning or neighbour problems.

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Badly detailed external insulation can damage the appearance of a period home.

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New windows can improve energy performance while destroying architectural character.

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An incorrectly planned ventilation strategy can create condensation problems after insulation work.

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Good green home improvement therefore requires more than selecting efficient equipment.

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It requires an understanding of the building, the regulations and how the improvements fit together.

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Plan Before You Install

 

APN Green Homes can help identify the improvements that may be suitable for your property and highlight where planning, Building Regulations or other approvals should be investigated before work begins.

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The aim is to create a coordinated Green Home Plan rather than a collection of unrelated installations.

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Every home is different. Your green home plan should be too.

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Before spending thousands improving your home, establish not only what you should install, but also what permissions, approvals and design work may be required.

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Green Home Assessment £495 + VAT

 

Tip: Before you spend thousands improving your home, find out where your money will make the biggest difference.