Extension idea and queries

[Daveywest]

Hello, I am new to all of this and we are just completing a house sale that needs an extension to make it suitable for us to live in. The vendors had previously been granted planning permission about 20 years ago. Although we are aware this is not a precursor to a new application being granted we are hopeful that we could get planning permission due to the regulations being relaxed since 20 years ago and that another 10 builds have had planning permission granted within the local area. I am trying to work out, the realistic cost of an extension. I think we would need a side and possibly back double story extension of about 60-80m2. we're looking to create a 4 bedroom house with a good size master bedroom with ensuite, add a utility room, cloakroom, and possibly a study downstairs space allowing.  There is about 4.5m of space to the right of the property and a good-sized rear garden. I've enclosed the existing plans for the house. Any help or even advice on what sort of extension we could do would be very much appreciated.

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Edited February 12 by Daveywest

[jack]

Hi @Daveywest, welcome to BuildHub.

 

Not everyone reads the Introduce Yourself sub-forum, so I've moved your post to a forum that's more likely to get you an answer to your question.

 

That's a nice-looking house, incidentally!

[Daveywest]

Thank you -:)

[torre]

Welcome and good luck!

On 12/02/2025 at 23:06, Daveywest said:

just completing a house sale that needs an extension to make it suitable for us to live in

There's always a risk you won't get the permission you want especially for a large extension

On 12/02/2025 at 23:06, Daveywest said:

of about 60-80m2

Or you can't afford it, realistically budgeting 2-3k/m2

 

As you say, a two storey side extension looks a good bet as you don't lose light to existing rooms, but planners may limit you to say a metre from the boundary, then single storey across the back.

 

There's quite a lot of uncertainty in the outcome here (cost and feasibility) so I hope you've factored this in.