Can I Add An Extension or Loft Conversion To My Flat?

// Building Contractors

Can You Add An Extension or Loft Conversion To Your Flat?

“Greg “Home
Flat Extension

Whilst not always as straightforward as adding a home extension or a loft conversion to a house, it can still be possible even if you are in a ground floor or top floor flat and you are only a leaseholder. Jeffery and Wilkes are London’s leading Building Contractors.

The first stage in planning your project is to check your terms of lease to see whether there are any restrictions on structural alterations, extensions and conversion of loft space etc. Also check that the garden belongs to you alone and is not for communal use before considering building an extension there. If you are unsure about anything mentioned within your terms of lease, get in contact with the freeholder for clarity.

It’s important to remember that all flats have their permitted development rights removed, so any alterations to the outside of the building will require permission from the local authority.

Ground Floor Extension

It certainly can be possible to add an extension to your flat, but you would need to obtain planning permission first.

If your flat is in a conservation area you may need to apply for planning permission to demolish any existing structures before applying for planning permission to build any new structures. If you are in a listed building, then listed building consent will likely apply.

Loft Conversion On A Top Floor Flat

If you need to extend upwards and change the roof shape, then you will require planning permission to have a loft conversion in your top floor flat. If it is just internal works, planning permission may not be required.

There would need to be a party wall agreement if the works proposed in the loft or ground floor are relevant to the Party Wall etc. Act 1996. See our article on ‘What is Party Wall Agreement’ below.

The next stage would be to get an experienced architect involved to measure and create drawings that can be submitted for planning approval.

Using a design and build company like Jeffery & Wilkes can save you a lot of hassle as we can do all the work for you including the drawings, applying for planning permission, the party wall surveying and even if the works should you desire to use one company throughout.

If you have any more queries or would like to see if you can extend your flat contact Jeffery & Wilkes on 020 88193883 or email

Speak to one of our team about how we can design and build your space.