Calculator | Extension Plans UK

Let's get you a quick quote

It takes only a couple of minutes to fill out our calculator, select what is relevant to your project and we'll give you a breakdown of costs.

What kind of drawings are required?

Plans & Building

Your property type:

0-2 Beds
3-4 Beds
5+ Beds

Is your property over 150 sqm overall?


When are you looking to start?

1-2 Months
3-6 Months
6+ Months
12+ Months

Would you be interested in using our interior design service?

(Prices from £247 - £457)

Would you be interested in speaking to our finance team?

Additional borrowing and re-mortgage experts all under one roof.

What parts of the property?

Ground Floor
Infil and Rear
Side and Rear
Side Infil Wrap Around
Side Infill
Wrap around
First Floor
Full width rear
Loft conversion
Front Dormer
Hip to Gable
Hip-Gable Dormer
L Shaped Dormer
Double Storey
Outbuilding Annex

Party wall notices?

Party wall notices are legally required to be served to your neighbours if your work is to affect their property. You can download free templates online or we can take care of the hassle. Party wall notices are £50 per neighbour. Do I need a party wall notice? Find out more – here.

Number of neighbors

Build over agreement drawings

This includes submission to your water supplier. If you are building over or near sewer pipes or manholes in your property you are required to apply to your water board on what your proposal is and how you intend to protect the pipes.

Include build over £150

Internal and external 3D Drawings

3D Drawings are not required for any application, but they do help visualise the space for your new project, our 3D package is an extra £249.00. See an example here here.

Include 3D Drawings £249

Site survey

Remember, measuring the site yourself is completely free. As long as the measurements are accurate we can work with them. If you'd like more information on how to measure your property you can refer to our guide. However, If you'd like for us to carry out a site survey we can source a local surveyor to carry out the work for you.

Include site survey £150

Scope of works document

A scope of works, is a document that is used by your builders, in conjunction with your building regulation drawings. A scope of works document details all additional works included within the renovation of your property. Our handy template can be filled in to include specific details and finishes to ensure all builders are quoting on a like for like basis.

Include Scope of works £10

Just a few details

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