Double Storey Extensions

Double Storey Extensions
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Our Services for Double Storey Extensions

Opting for a double storey extension not only gives you that extra space but will also add value to your property. Many homeowners consider a two storey extension over a single one as whichever option you choose, you only need one roof and set of footings. Hence the reason for getting more value from your build and that extra space for bedrooms or bathrooms you require.

There are many options for where to have your extension built, a double storey rear extension is normally the best location.

Before you start you will need to consider how to use the extra space, extra living space, kitchen and bathroom are the best use and easier to blend in to your existing property. Take a look at our case studies below or get in touch with us for more information.

Frequently Asked Questions about Double Storey Extension

What’s the cost of a Double Storey Extension?

The cost of the project of a double storey extension per square metre is only slightly higher compared to single storeys, and you save a lot of money by expanding multiple floors at once, rather than separate projects down the line.

General double storey extension cost in London
The cost of multi-storey extensions usually average around £1800/sqm. The cost of your project will naturally vary depending on materials, finishes and the type of design you will choose. However, to summarize, we can say that a standard 4mx5m double storey extension ( with a total of 40sqm gained over the two floors) will cost you around 53£ for the build cost alone. This is without VAT or fees for professionals and interior fitouts.

To give you an idea of the planning and professional fees you will need to take into consideration, these can be summarised as follows:
Architects London average fees 10% / Administration fees: 1% / Structural engineer: 4% / Surveyors: 3% / Contractors:30% / VAT 20% In addition: Planning fees for a residential two storey extension in England is £206. Building control charges depend on your extension’s size. Costs vary between £200 (for 10m sq) to £900 (for 80 to 100m sq).

Do I need planning permission for a Double Storey Extension?

If you are considering a double storey extension to add value and space to your property, you might be able to build under permitted development. However, there are some restrictions to what you can build under permitted development. Your two storey extension can only be built at the rear of your property and it cannot be taller than the highest point of the existing roof or extend beyond the rear wall for more than 3m. In addition the new extension’s materials need to match the ones of the existing building and it needs to be at least 7m from the boundary. Any openings on the side of your extension will need to benon-opening and obscure-glazed.

Last but not least, if the roof of your new extension connects to the existing roof you will have to subtract the volume of the extension roof from any loft conversion volume allowance you might have.

Will a double storey extension add property value?

Adding footage to your home will certainly boost the value of your property on the market. Research carried out by Nationwide shows how home improvements and home extensions can add significant value to your property. Adding a double bedroom to your house and an en-suite can increase value by 23%.

Double Storey Extensions: Before and After

Double Storey Side Extension in Croydon 2019