There are various different ways to design, build and deliver a high-quality side extension. As part of our guides to home extensions, in this article, we discuss the best options for you to consider when looking to add a side extension to your home.
What is a side extension?
A side extension or side return extension is built upon the part of the land that runs down the side of a building or property, creating additional living or working space, usually in the form of another room(s). The land is typically unused and forms a gully or side alley to the back of a house and is an excellent way of adding additional space to your property.
We’d advise that you should expect to pay similar amounts as you would a single-storey extension depending on the space available. Other things to consider include
- Type of finish you want
- Use of the space involved (e.g., if you’re converting it to a downstairs bathroom, there could be additional costs for plumbing/electrics etc.)
- Roof specs
Yes, you can, again, similar costs to a double-storey extension. You can read more about the typical costs involved in our two storey extensions guide.
In most circumstances, planning permission for a side extension is included within the permitted development of a house. There shouldn’t be any issues regarding extending to the side unless you plan a two-storey extension or the width is more than 50% of the original building.
Ashby Facilities always recommends letting the local authority know of your plans to extend and always consult your neighbours. There could be objections and cause you issues with the council and your neighbours, so we always advise you to seek permission first.
You can build a side extension, but it must not extend beyond the rear wall of the original house by more than three metres. A typical side return extension must also be single storey or planning permission will be required.
Your side return extension should be no wider than half the width of the original property or building. If this is within 2 metres, the max eaves should be no higher than 3 meters.
There are two typical types of roofs for side return extensions. These are
On average, a single storey roof uses around 1000 tiles, which, if building yourself, your local building merchant can price accordingly. You’ll need to consider if you want to include skylights or any other features that would increase costs.
You can purchase a flat roofing kit which starts from £250. Although the equipment and price of the materials vary depending on the size of the roof, we’d always recommend using trained professionals like ourselves. Costs may increase, but you’ll be having the added benefit of years of industry experience and skill.
If you build your extension within the permitted development rights (as detailed earlier in the blog), then no, you won’t need planning permission.
If you’re extending to create a new bathroom, a side extension for a house could add around 5-8% to the value of your house
Extensions generally can add anywhere between 10-12% – we advise you to do your homework first ask local estate agents or anyone in the area who has already extended.