Architectural approvals and planning permissions for home extensions in Essex, designed by Kirkwood.

Approvals, PD and planning permission service

Providing expert guidance on building permission for home extensions and renovations across Essex

What is local council approval and why does it matter?

Every project requires approval, regardless of size. Once the final architectural design is approved by the customer, we promptly submit the necessary application to the local council. For projects potentially falling under Permitted Development (PD)—subject to council discretion—we secure a certificate of lawfulness.

Homeowners sometimes seek our help after work is complete, only to find that exposing steelwork, roof structure, and foundations is necessary. This can lead to costly remedial work if the build doesn’t meet regulations. By obtaining approvals upfront, our Essex architectural design team ensure that structural calculations and building quotes are accurate and compliant, making home extensions safe and efficient in Essex.

Expert planning permission service for home extensions

A professional planning permission service ensures your home extension meets all regulations and gets approved without delays. Experts handle applications, prepare accurate drawings, and liaise with the council to prevent costly mistakes. Whether you’re planning a single story extension, loft conversion, or double story extension, the right guidance helps streamline the process and improves approval success.

The importance of good design in planning permission

A well-designed planning permission service application increases approval chances and prevents costly revisions. Clear, accurate plans help councils assess compliance with regulations, reducing delays. Good design ensures your home extension meets both aesthetic and legal requirements, creating a smoother approval process.

Our planning permission service and approved projects in Essex

We've left some good impressions

See what our customers in Essex are saying on

Jack Dev
08:58 04 Mar 25
I was looking for an architect in Billericay and came across Kirkwood. They designed my single-story rear extension, which includes an open-plan kitchen and an internal knock-through. The architects and structural engineers were fantastic and really understood what I wanted to achieve. Kirkwood also put me in touch with local builders who were reasonably priced and completed the extension without any fuss. If you’re looking for a reliable Essex architect serving Billericay, I’d definitely recommend Kirkwood.
Maria Krystal Humphrey
11:20 03 Feb 25
We had a single-story house extension built in Thurrock, Essex, by the builders that Kirkwood passed us onto. Kirkwood's architects did a really good job, so we were pleased we went to them rather than a design-and-build company that just subcontracts the architectural work out.
Grace Biddiss
09:27 02 Feb 25
We appointed Kirkwood as our architects for a double story and wrap around kitchen extension in Billericay, Essex. They provided us with architectural plans, structural engineering and building regulation drawings. The team was professional from start to finish and the builder they recommended has done a faultless job. You definitely get what you pay for, highly recommend. Thanks!
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.
Harry
14:41 01 Feb 25
I was skeptical about Kirkwood’s 5 star reviews but now I’m one of them. Incredible service, especially for the money we paid. They wasn’t the most expensive but for the standard of service we received, they defiantly should have been. They done the architectural plans for our home extension in Chelmsford. The architect was amazing at creating our open plan kitchen and dining area. The structural engineer was quick, polite and drunk tea like it was going out of fashion. Strongly recommend if your considering a architect for your home extension in a Chelmsford.
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!
Expert architectural design service for loft conversions in Essex by Kirkwood Architects, creating bespoke and functional living spaces.

Why choose our services for approvals or planning permission.

Even if your home extension falls under permitted development, it still requires approval to confirm compliance. A Certificate of Lawfulness provides official confirmation that your project meets regulations, preventing issues when selling your home. Without it, you may face legal complications or costly delays. Our planning permission serviceensures you get the right approvals, whether through a full application or permitted development confirmation, giving you peace of mind and protecting your investment.

Years of Planning Experience

With decades in the industry, we’ve seen it all. If planning mistakes were trophies, we’d need a bigger shelf. Luckily for you, we’ve already learned the hard lessons, so your planning permission service is handled the right way from the start. We take pride in setting the standard, offering honest and transparent guidance to get your project approved.

Tailored Advice for Every Home

No two homes are the same, and neither are their approval needs. The first step is understanding your plans and seeing what’s possible. Whether it’s permitted development or full planning permission, we advise on the best approach to get your home extension approved while making the process as smooth as possible.

Support Beyond Approval

Getting planning permission is just one step. Once you’ve got the green light, we don’t just disappear. We can connect you with reliable builders and guide you through the next stages. If you’ve got questions, we’re always at the end of the phone—no endless email chains, just straightforward support when you need it.

Our Planning Permission Process

In our eyes, there’s only one way to do the job—the right way. We treat every project as if it were our own. If there’s a way to save you money and hassle, we’ll let you know and guide you towards the best approach for your needs. A planning permission service shouldn’t be stressful—it can be a straightforward and even exciting process with the right support.

Initial Consultation and Site Visit

If you’ve already received a quote from us, you’ll know how competitive we are. To keep costs down, we provide 90% of the answers upfront before visiting your property. Using Google Earth, we assess your home and review neighbouring extensions to understand your planning permission service options. This gives us a strong insight into what’s likely to be approved.

Concept Development and Drafting

Once you give us the go-ahead, we start the survey. We measure everything down to the smallest detail so we can first draft the existing layout. From there, we develop designs for the proposed work. We keep refining until you’re completely happy—most of the time, we get it right in the first or second draft.

Planning Permission and Regulations

With regulations constantly changing in Essex, it’s worth working with a company that stays ahead of the curve. We make sure every project complies and always gain some form of approval from the council for peace of mind. Although not always required, we can offer building regulation drawings. If you don’t want to leave it to your builder to decide how your home extension is constructed, we can handle it for you. A planning permission service shouldn’t stop there—we also provide structural calculations where needed.

Honest Reviews from Our Customers

We ask every customer to leave us an honest review. Not everyone gets around to it, but for those who do, we appreciate it. It’s not just about 5-star ratings—it’s about helping future customers navigate this sometimes tricky industry. If you have a moment, we’d love to hear your feedback.

Modern rear extension in Braintree, Essex, designed by Kirkwood Architects, featuring an open-plan layout with large windows and a seamless connection to the garden.

frequently asked question

Please complete an enquiry form and submit your details. We will call you within 1 working day. If we can get through we will email you instead.

We are based in Wickford but we cover the whole of Essex and some part of London. 

Prices start at £1,195.00 and go up to £2,995.00

Permitted development for house extensions allows homeowners to build specific types of extensions without needing planning permission, provided they meet government-defined size and location criteria. As part of our architectural design service in Essex, we ensure your extension complies with these regulations. Additionally, we assist in obtaining a certificate of lawfulness, giving you legal confirmation that your project falls within permitted development rights

Get in contact with usb either calling, emailing, requesting a callback or completing an enquiry form. We are very quick at responding to enquiries.

Use ours is the short answer. We don’t have many as they are hard to come by, but the ones we do, won’t let you down.

Always contact an architect first if you want sound advice on what steps to take. They can help you design properly and navigate permissions. As part of our service, Kirkwood advises clients on realistic build costs in Essex to help them plan ahead.

A certificate of lawfulness (COL) for a house extension is an official document that verifies the legality of a proposed or existing extension. It is also referred to as a lawful development certificate (LDC).

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