Most conservatories in Crawley can go ahead without a planning permission, thanks to permitted development rights. You just need to stay within some generous height limits, which we’ve set out below.
It’s worth getting these details right from the outset. Since April 2024, councils have had ten years, up from four, to take enforcement action on unauthorised building work, so an assumption made early on can cause problems much further down the line.
Here’s our guide to conservatory planning permission in Crawley, covering what actually applies and where the exceptions lie.
The good news: permitted development covers most conservatories
Conservatory planning permission in Crawley works the same way as anywhere else in England, because permitted development rights come from national planning law. Check the full detail on the Planning Portal, as your property’s own history can affect what rules apply.
Size and height limits: what permitted development actually allows
For a conservatory attached to the rear wall of your home, the standard limits are as follows:
- No more than 4 metres beyond the original rear wall for a detached house, or 3 metres for a semi-detached or terraced property
- A maximum height of 4 metres overall
- An eaves height (where the roof meets the wall) no higher than 3 metres if the conservatory sits within 2 metres of a boundary
- Side extensions limited to half the width of the original house
- A roof pitch matching your existing house where practical, and nothing built out past the front of the house
Want to go bigger? The larger home extension scheme allows rear extensions up to 8 metres on a detached house, or 6 metres on others. You’ll just need prior approval from the council first, which includes consulting your neighbours. Go beyond these limits, and you’ll usually need full planning permission instead.
Do I need building regulations approval for a conservatory?
Usually not. Most conservatories are exempt from building regulations if they’re at ground level, under 30 square metres and separated from the house by external doors.
The exceptions: when you will need a full planning application
Permitted development rights don’t apply everywhere, and a handful of situations tend to catch people out. You’re likely to need a full planning application if any of the following apply:
- Your home is a listed building, in which case you’ll need listed building consent regardless of size
- You’re in one of Crawley’s conservation areas, such as Ifield Village, Worth or the High Street
- Your street has an article 4 direction, a council order that removes these rights in specific areas
- Previous extensions have already used up your allowance
- You plan a change of use later, such as turning the space into a self-contained annexe
If you’re not sure which of these applies to your home, a quick check with the council before you commit to a design will tell you exactly where you stand.
Extra reassurance: getting formal confirmation in writing
Even if your project fits comfortably within permitted development, you can still get this confirmed in writing. It’s called a lawful development certificate, and it’s useful proof if you ever come to sell.
Plan your Crawley conservatory with BSF Windows
Once you know where you stand, our experienced team can take it from there. We survey your existing house and check distances from the original rear wall and boundaries, then tell you honestly what’s possible before any building work begins.
We design Victorian, Edwardian, lean-to, gable end, P-shaped and bespoke conservatories. Each one is built for structural integrity and strong thermal performance, whatever use the space for, from a home office to a dining room.
If you have any questions about building your dream conservatory, we’re happy to help.
Get in touch for a free, no-obligation survey and quote:
- Online: Contact BSF Windows
- Telephone: 01293 408 713
- Email: bsfwindows@gmail.com
- Showroom: 31-33 Station Road, Horley, Surrey, RH6 9HW