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When Do You Need Planning Permission for Home Improvements?

23 March 2026

Whether you are dreaming of a new extension, converting your loft, or simply refreshing the look of your property, one of the first questions to ask is: “Do I need planning permission?”

The answer is not always straightforward and getting it wrong can be both costly and stressful. For homeowners across Dorset, including Bournemouth, Christchurch and Poole, understanding the basics before starting work can save significant time and expense.

What is planning permission?

Planning permission is formal approval from your local planning authority (LPA) required before carrying out certain types of building work. It ensures that any development is appropriate for the surrounding area and does not negatively impact neighbours or the environment.

If your project requires planning permission and you proceed without it, the LPA can issue an enforcement notice requiring you to reverse the work. Ignoring such a notice is a criminal offence, so it is essential to get this right from the outset.

Permitted development: what you can do without applying

Many common home improvements fall under permitted development rights. These are national rules allowing homeowners to carry out certain works without submitting a full planning application.

Typically, you won’t need planning permission for:

• Most internal alterations, such as installing a new kitchen or bathroom
• Rewiring or internal reconfiguration
• Garage conversions (in many cases)
• Minor external changes, like repainting or replacing windows and doors with similar designs

Some larger projects may also fall within permitted development, provided they meet strict limits:

• Single-storey rear extensions
  • Up to 8 metres for detached houses
  • Up to 6 metres for semi-detached or terraced houses
  • Maximum height of 4 metres
• Loft conversions
  • Up to 40 cubic metres (terraced houses)
  • Up to 50 cubic metres (detached and semi-detached homes)
• Outbuildings (sheds, garages, garden rooms)
  • No more than 4 metres high
  • Must not cover more than half the land around the original house

Even where permitted development applies, the rules are detailed and exceeding them even slightly can mean permission is required.

When you will need planning permission

You are likely to need planning permission if your project involves:

• Building something entirely new
• Making a significant structural change
• Changing the use of your property
• Extensions that exceed permitted development limits
• Raising the roof height for a loft conversion
• Adding balconies or raised platforms

There are also specific rules for boundaries and outdoor areas:

• Fences, gates, or walls over 1 metre high next to a highway
• Fences or walls over 2 metres high elsewhere
• Paving over a front garden with non-permeable material exceeding 5 square metres

Special circumstances to watch out for

Permitted development rights do not apply equally to all properties. Stricter rules apply if your home is:

• A listed building
• Located in a conservation area
• Within an area of outstanding natural beauty or a national park

Additionally:

• Flats and maisonettes do not benefit from the same permitted development rights as houses
• Some newer homes have restrictions placed on them through planning conditions
• Your title deeds may contain restrictive covenants limiting what you can do

These factors are particularly relevant in parts of Dorset where conservation and heritage considerations are common.

It is not just about planning permission

Even if planning permission is not required, your project may still need to comply with building regulations. These ensure that construction work is safe, structurally sound, and energy efficient.

You may also need to consider:

• Building regulations approval for extensions and structural work
• A party wall agreement if the work affects a shared wall with a neighbour

How to apply

If planning permission is required, applications are usually submitted online via the Planning Portal.

Key points:

• Current fee for household applications in England: £258
• Typical decision timeframe: around 8 weeks
• Pre-application advice from your local authority can help avoid delays

If your application is refused, you have the right to appeal.

Getting the right advice

Planning rules can be complex, and the consequences of getting them wrong can be significant. For homeowners in Bournemouth, Christchurch, Poole and across Dorset, seeking professional advice early can make all the difference.

A solicitor can:

• Clarify whether your project needs planning permission
• Check for restrictive covenants
• Guide you through the application process

Taking advice at the outset can help you avoid costly mistakes and ensure your home improvements proceed as smoothly as possible.

Speak to Our Property Team

If you are planning home improvements and are unsure where you stand, our experienced property solicitors are here to help. We regularly advise homeowners across Dorset, including Bournemouth, Christchurch and Poole on planning permission, restrictive covenants, and property-related matters.

Getting clear advice at an early stage can save you time, money, and unnecessary stress.

Contact us today to discuss your plans with a member of our team and ensure your project starts on the right footing. Call 01202 526343 or send us an enquiry through our website to arrange a consultation.

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