Smart design, expert planning, and all the advice you need

Quite possibly the UK’s leading residential design specialists delivering thoughtful design, straight-talking advice and clear guidance on build costs.

Essex's #1 architectural design firm

With the most 5-star
Google reviews

A trusted company you can rely on

Comprehensive packages containing everything you need

Covering anywhere in the Essex and London areas

An experienced team of house extension experts

With 5,000+ projects to our name

We provide all the services you'll need

Avoid the hassle of using multiple companies

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Kirkwood - The Extension Planning Company

5.0

Based on 60 reviews

review us on

Freyja

19:14 01 Feb 25

We’ve worked with residential architects before, but Jamie and his team, especially Nathan, were fantastic. Kirkwood designed plans for our double-story side extension, loft conversion, and single-story rear kitchen extension, and we knew we had to choose the right company since it involved our entire home.

Based in Brentwood, Essex, we were also introduced to builders and tradespeople through Kirkwood, and they were excellent—professional, respectful, and a pleasure to work with. If we ever take on another project, we wouldn’t hesitate to use them again.

Riley Russell

13:58 31 Jan 25

Kirkwood done a fantastic job on our architectural plans for our new single story kitchen extension in Brentwood. They gained us approval from the council and also provided the structural engineering for the project. We used their recommended builder who so far, we cannot fault one bit. Thanks again and highly recommend.

iansalsbury

10:54 24 Jan 25

The Kirkwood team were a pleasure to work with and have in our house. What can be a stressful time was made a lot easier by a team who build with quality, communicate clearly, and address and action any questions you raise....however small or large.
We now have an amazing extension, and would be happy to use the team again.

Natalie Moore

12:29 23 Jan 25

Jamie and team are always helpful and very knowledgeable. Work on our kitchen extension carried out professionally and to high standard from design to build completion. A fantastic job, and very pleased. Many thanks

Kelly Pye

08:27 22 Jan 25

Jamie has provided lots of advice on house improvements including different options for extending as well as the possibility of a loft conversion. He responds quickly to queries and is full of knowledge! I wouldn’t hesitate to recommend him

Boris

19:35 12 Nov 23

Kirkwood Design and Build Builders, Wickford did a fantastic job on our extension in Billericay. They helped with planning permission, design, and build. Professional company through and through. Given that we haven't done such a large project before, we were a bit nervous and had a lot of questions. Jamie and his team from Kirkwood Design and Build Builders was good putting us at ease and now that we are fully complete with all our work, we further appreciate how professional this company is. Would highly recommend.

Holly Luckin

09:29 11 Nov 23

Nothing was to much hassle and Jamie is lovely!

john rocke

11:33 09 Nov 23

Great company and very professional. Nothing was a problem, very helpful and will definitely use them again. Have already given their details to a friend of mine.

Dave Lynch

19:32 08 Nov 23

Work carried out to a very high standard, very pleased with the results.

Sharon Gormer

13:06 07 Nov 23

Very professional company, helpful and friendly staff.

Aaron Tutton

11:15 07 Nov 23

Great builders, very professional and perfectionists! Thank you for such an amazing job

Olly Tait

13:28 21 Apr 23

Jamie and his team were so profesional from start to finish and made the job a joy to watch our dream come together.
Very knowledgeable and contactable throughout the process.
Couldn't ask for a better outcome and value for money.
Will definitely be recommending and 100% will use again!
5 star!!!

Sandie

20:03 20 Jan 23

I highly recommend the Kirkwood team! Exceptional workmanship, clear communication, Jamie & his team have provided the utmost as a polite & professional team! Very satisfied customer, looking forward to planning our loft conversion this year with you guys! Many thanks!

About us

Kirkwood is a trusted, family-run architectural design and structural engineering company specialising in house extensions. We provide everything you need to get your project ready for build. From the outset, we advise on realistic build costs so your design stays within budget. We’re always happy to offer free advice to help you get started—just get in touch.