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- Step 1 of 17

Steph Fanizza, Architectural Design & Team Manager

Use this cost calculator to generate a quote for your extension or conversion plan

It takes less than 1 minute!

Use this cost calculator *

Get my quote

Please confirm your current property type:

Please confirm your current property type: *

Detached
Semi-detached
Terrace

What type of extension are you planning?

Detached *

Single Storey
Double Storey
Loft Conversion

Semi Detached *

Single Storey
Double Storey
Loft Conversion

terrace *

Single Storey
Double Storey
Loft Conversion

Is the extension to the rear or side of your home?

Detached - Single Storey *

Rear
Side
Rear & side
Wraparound

Is the extension to the rear or side of your home?

Detached - Double Storey *

Rear
Side

Are you planning to add a dormer?

Detached - Loft Conversion *

Yes
No

Is the extension to the rear or side of your home?

Semi-detached - Single Storey *

Rear
Side
Rear & side
Wraparound

Is the extension to the rear or side of your home?

Semi Detached - Double Storey *

Rear
Side

Are you planning to add a dormer?

Semi - Detached - Loft Conversion *

Yes
No

Is the extension to the rear or side of your home?

Terrace- Single Storey *

Rear
Side
Rear & side
Wraparound

Is the extension to the rear or side of your home?

Terrace - Double Storey *

Rear
Side

Are you planning to add a dormer?

Terrace- Loft Conversion *

Yes
No

Are you adding a second storey to an existing single storey extension?

Detached - Double Storey - Rear Or Side *

yes
no

Are you adding a second storey to an existing single storey extension?

Semi-Detached - Double Storey - Rear Or Side *

yes
no

Are you adding a second storey to an existing single storey extension?

Terrace- Double Storey - Rear Or Side *

yes
no

Thanks for confirming. To continue, please let us know the approximate area of your extension or conversion, in square meters.

Please only include a numerical value. *

Great! What type of roof are you planning to have?

Roof Options *

Flat Roof
Mono Pitch
Dual Pitch
Crown

Do you plan to install Bifold doors? If yes, please choose the closest approximate length.

Bifold doors *

No Bifold doors
2m Bifold doors
4m Bifold doors
6m Bifold doors
8m Bifold doors

Are you planning to add Skylight windows?

Skylight windows *

yes
no

Great, how many skylights will there be?

Skylight Windows Number *

1
2
3
4
5
6

Thanks for answering those questions, now we just need to confirm any specific rooms that you are planning to include.

How many bathrooms will there be in the extension/conversion?

Bathrooms Number *

No bathrooms
1
2
3

Will you be including a kitchen?

Including kitchen *

yes
no

What standard of kitchen would you like?

This is just a rough idea.

kitchen Standard *

Basic
Mid-range
Premium

Will you require a utility room?

Utility Title *

yes
no

As average building cost varies all over the country, please specify your post code for a more accurate costing

postcode *

We just need a few details before providing your quote

First Name *

Last Name *

Email *

Phone *

Full Address *

Perfect Thanks!

Would you like a fee proposal for our planning service (planning permissions lasts 3 years)? *

Yes Please
No Thanks

Would you like our service for structural drawings? *

Yes Please
No Thanks

Are you ready to start your project now and would you like to be contacted? *

Yes Please
No Thanks

Would you like to receive the Building quotes from the recommended Builder?

Yes Please
No Thanks

Steph Fanizza, Architectural Design & Team Manager

Tell us about your plan and we'll send you a free quote! It takes less than 60 seconds!

Step 1 of 8

What is your current property type? *

Detached

Detached

Semi-Detached

Semi-Detached

Mid-Terraced

Mid-Terraced

End-Terraced

End-Terraced

Bungalow

Bungalow

Flat

Flat

What type of work do you plan? *

Detached

Single Storey Extension

Semi-Detached

Double Storey Extension

Mid-Terraced

Loft Conversion

End-Terraced

Basement Extension

Bungalow

Flat Conversion

Flat

Change of Use

Flat

New Build

Flat

Commercial

Please tell us more about your plan* Postcode of your project *

Are you interested in any of these services?

What professional are you looking for?

What is your approximate construction budget *

Upto 50K

50-100K

100-250K

250-500K

500K-1M

1-2.5M

More than 2.5M

It is a Listed building/in a conservation area? *

Yes

No

Not Sure

Have any neighbors previously completed the same proposed scope of works*

Yes

No

Not Sure

When would you ideally like to start the design process? *

If available, please upload any existing drawings / plans / sketches

First name * Last name * Email Address * First line of project address * Phone Number *

+44

Where did you hear about us?

Do you have additional comments for the EA Team?
When is best for us to call you? Our minimum level of engagement is £2,000 and can go up from there depending on the scope of your project.

Yes

No

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House Extensions

Single Storey Extensions

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Extension Architecture is one of the leading Architect & Planning Consultant practices in London. We specialise in Planning Applications, Building Regulation Drawings, Architectural Design and Project Management. However you are planning to improve your home, we at Extension Architecture are here to help.

Phone: 0203 409 4215

Email: [email protected]

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231 Roehampton Ln,
London,
SW15 4LB

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