Conservatory Planning Permission: Do You Need It?

Conservatory planning permission worries a lot of homeowners. The good news is that many conservatories do not need it. In England, many fall under permitted development rights. However, some do not, and building regulations are a separate matter. This guide explains both in plain English.

Rules change, so always confirm the details with your local council. For East Grinstead, that is Mid Sussex District Council. This guide is general information, not legal advice.

Conservatory with a brick base, a common example when checking conservatory planning permission

When do you not need conservatory planning permission?

A conservatory is treated like a single-storey extension. If it stays within permitted development limits, you do not need to apply. These are the main limits for a rear conservatory in England:

It must not extend more than 3m from the back wall of a semi-detached or terraced house. For a detached house, the limit is 4m.
It must not be higher than the highest part of the existing roof.
Eaves within 2m of a boundary must be no more than 3m high.
It must not sit in front of the house where it faces a road.
With other buildings, it must not cover more than half the land around the original house.

Larger extensions of up to 6m or 8m may be allowed through the prior approval process. In that case, your neighbours get a chance to comment.

When do you need conservatory planning permission?

You will need to apply if your plans break those limits. For example, a conservatory that is too deep, too tall or too close to a road needs permission. Listed homes need Listed Building Consent. Conservation areas, National Parks and Areas of Outstanding Natural Beauty have stricter rules too. In addition, some councils remove permitted development rights through an Article 4 Direction. Therefore, always check before you build.

Do conservatories need building regulations?

Many do not. A conservatory is usually exempt if it meets all of these conditions:

It is 30 square metres or smaller.
It sits at ground level.
It is separated from the house by external-quality doors, windows or walls.
It has its own heating, with its own controls.
The glazing and electrics meet the safety rules.

However, a few changes bring building regulations into play. For example, swapping a glass roof for a solid tiled roof means the building is no longer a conservatory. So building regulations apply. Connecting the conservatory to your home heating does the same.

What about bifold doors?

Bifold doors are usually simpler. If you are replacing existing doors or windows, you normally do not need planning permission. Instead, the work must meet building regulations. A FENSA-registered installer can self-certify the work and give you a certificate. Meanwhile, a brand-new opening in a structural wall needs proper support, so building regulations apply there too. Listed buildings and conservation areas may need extra consent.

How to check conservatory planning permission for your home

First, measure your plans and note how far they stick out and how high they are. Next, read the guidance on the Planning Portal. Then ask your council if you are still unsure. A Lawful Development Certificate gives you written proof that your plans are lawful.

Faron Home Improvements designs and fits conservatories and bifold doors across East Grinstead, Crawley and Horsham. During a free survey, we can talk you through the rules on conservatory planning permission for your property. See our conservatories in East Grinstead and bifold doors in East Grinstead, or contact us on 01342 643075.