- The existing roof height won’t be raised and the front of the building won’t be significantly altered (the back usually can be changed but check your local council’s rules).
- No more than 50 cubic metres is being added to a detached or semi-detached house, and only 40 to a terrace house. This includes any previous loft additions.
- There is 2.1 metres of head-height in a good part of the main area. This is sensible, but it doesn’t stop you putting a loo or bathroom under a sloping eave — ie, where less headroom is needed.
- If you want a balcony or terrace, you will need planning permission.
- You obtain a “completion certificate” from your council after the work is done to show your new loft complies with building regulations and fire-safety rules. Your architect can arrange all this. Visit planningportal. co.uk for more details.
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A loft conversion usually comes under “permitted development” (ie, you don’t need planning permission) but special rules govern conservation areas and “listed” buildings. To stay within the rules you need to ensure: