House Extension Plans for Planning & Building Regulations

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Looking For Extension Plans Your Builder Won’t Laugh At?

Leave the DIY drawings to the cowboys — we’ll get your extension built on time and within budget

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You’ve probably seen it already: extension plan prices are all over the place. A couple of hundred quid here, a few thousand there — and no clear way of knowing what you’ll actually get.

Go too cheap, and you risk plans your builder laughs at — or worse, drawings done wrong that end up costing you thousands more during the build. Go too expensive, and you’ll end up paying through the nose for nonsense you don’t need — like schedules for architraves and skirting boards — just to inflate their already extortionate fees.

Either way, it’s a minefield. Nobody wants to waste money, and nobody wants to pay for the same job twice.

Extension Plans That Don’t Waste Your Time, Your Money, or Your Sanity.

Too many people make extension plans sound like rocket science. They’re not. Ours take four steps, a bit of common sense, and end with your extension getting built on time and within budget. Let’s take a moment to walk you through it.

Step 4

We Scan Your Home

Every extension project starts with a LiDAR survey. Our advanced 3D scanner captures your property with millimetre accuracy — far more precise than a tape measure or handheld laser. This means we begin with a perfect digital model of your home, removing the guesswork that causes so many problems later on.

Same-Day, In-Person Design Meeting

Your architectural designer will visit you at your home on the same day as your LiDAR scan. And here’s the key difference: this is the very same person who’ll be drawing your plans — not a freelancer with a 3D scanner who also knocks out floor plans for estate agents. You get real design expertise, face-to-face, with the person who will see your project through properly.

Step 3

We Create Your Extension Plans

Back at the office, our team gets to work producing your extension drawings. These include everything from existing and proposed floor plans to elevations, sections, and roof details. We make sure the plans are practical for builders, compliant for council approval, and crystal clear so there are no nasty surprises on site.

Step 4

Approvals and Beyond

Finally, we take care of the submission process. We liaise directly with the local council, respond to their queries, and keep things moving until your plans are approved. With our track record, you won’t be stuck in planning limbo — instead, you’ll have builder-ready drawings and the green light to get your extension underway.

Plans Approved. Clients Delighted. Google Agrees...

R
RVia Google
Review on behalf of my parents- Mr & Mrs Sparrow We were really struggling to get our Land Registry plans approved due to confusing and unhelpful advice from a solicitor. Then we spoke to Kev — and what a difference! With just one quick call, he clearly explained what needed to be done and suggested we submit both our own and our neighbour’s plans together. Thanks to his expert advice, everything was approved straight away. He completed the plans quickly, efficiently, and at a very reasonable price. No stress, no hassle — just a great service from start to finish. Absolutely brilliant. Highly recommend Kev to anyone needing Land Registry Compliant Plans.
Deni Nygate
Deni NygateVia Google
Kevin is flexible, listens to what has been asked. He is knowlegeable about ideas and suggestions and gives you leave options. The plans were clear to read and were done to a professional high standard. If you live in Essex and want a good value price then Kevin is the man to contact. My plans were submitted on Monday as the price is going out and they were done in a timely manner.
Charlotte Manson
Charlotte MansonVia Google
Kev from Surv Design was incredibly helpful when we needed land registry compliant plans drawn up for our leasehold property. After a couple of months when our buyers solicitor came back asking for revisions to be made, we received these within a couple of days. Thank you Kev for making a stressful process much easier! We are very grateful for your time and help!
Glen Carlos
Glen CarlosVia Google
Kev and the team have been amazing at working with me to ensure my planning application goes through smoothly. I live in a conservation area so it was daunting to even begin the process but Kev put me at ease straight away. Communication has been great and I would highly recommend Surv Design.
Pete Johnson
Pete JohnsonVia Google
My experience in dealing with Mr Kev Miller of Essex Architects and Party Wall Surveyors is one of thankfulness. Having discussed my problem with Kev, which he fully understood, I sent him some follow-up details which were used by him to give a quick response. I am extremely grateful for his time, knowledge and understanding in dealing with my problem.
Shouab Miah
Shouab MiahVia Google
I use them first time Mr kev Miller is the best man I ever seen and very reasonable price and very good service he handling our case smoothly he is very knowledgeable and friendly we got approved our side double extension and back 6 metre extension. Thank very much kev for your hard work.
Elizabeth Szkolny
Elizabeth SzkolnyVia Google
Excellent service from Kev and Millie at Surv Design. Would not hesitate to recommend them to anyone.
Roger Essex
Roger EssexVia Google
Straight forward talking and great communication from start to finish. Highly recommended for your project.
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Included as Standard Traditional Local Architect Online-Only Architects SurvDesign
Fixed, transparent pricing Not included Included Included
Unlimited design revisions Not included Not included Included
Immediate project start Not included Included Included
3D LiDAR property scanning Not included Included Included
Local knowledge & planning expertise Included Not included Included
Meet your designer face-to-face Included Not included Included
Remote/online meetings available Not included Included Included
Council submissions handled for you Not included Not included Included
Everything under one roof (Party Wall, Land Registry, CAD) Not included Not included Included
Personal, local service Included Not included Included
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House Extension Plans

“A well‑planned extension adds practical, valuable space. SurvDesign creates clear, compliant drawings for planning permission and Building Regulations so your extension is approved quickly and built with confidence. From side‑return kitchens to two‑storey additions, we’ll help you maximise light, head‑height and flow while keeping neighbours and policy in mind.”

Extension Plans That Unlock Space

Extensions come in many forms — and each site has its own constraints. We design with daylight, circulation and structural efficiency front of mind, so the space feels bigger and works better day‑to‑day.

Popular extension types we design

  • Single‑storey rear extensions for larger kitchens and open‑plan living.

  • Side returns to widen narrow terraced homes.

  • Wrap‑around extensions combining rear and side for maximum footprint.

  • Double‑storey extensions for extra bedrooms and bathrooms.

  • Front/porch extensions to add kerb appeal to your home.

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Planning vs Building Regulations drawings

Planning drawings demonstrate how your extension fits its context; Building Regulations drawings set out how it will be built safely and compliantly. We can provide either package or a combined route from concept to construction.

What Your Extension Drawing Pack Includes

Planning Application Drawings

Location and block plans, existing/proposed floor plans, elevations and roof plans with key dimensions and materials. We can provide a Design & Access Statement where required and advise on permitted development or LDC applications.

Building Regulations & Construction Details

GA plans/sections with specification notes, U‑values and ventilation rates, plus typical junction details (foundations, openings, insulation build‑ups, roof abutments and drainage). Prepared for Building Control and contractor pricing.

Our Process for Extension Projects

Briefing & measured survey

We capture your goals, measure accurately and confirm scope, outputs and timelines.

Design options & feedback

You’ll review clear options with mark‑ups to refine layout, roof form and glazing strategy before we lock the scheme.

Final drawings & approvals

We prepare the validated planning set and a coordinated Building Regs package, then assist with submissions and queries.

Why Choose SurvDesign for Extension Plans

Buildable designs that win approval

Policy‑aware design with practical detailing that contractors understand.

Fast turnaround & clear pricing

Efficient workflows and fixed quotes tailored to scope.

Coordination with engineers & contractors

Joined‑up information reduces RFIs and keeps the build on programme.

Get a Fixed Quote for Your Extension

Share your aims and any existing plans. We’ll recommend the right route and provide a fixed, transparent price.

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FAQs

Do I need planning permission for an extension?

Many rear and side extensions can be permitted development if they meet rules on size, height and materials. We’ll confirm your best route and whether a Lawful Development Certificate is advisable.

Will you coordinate with my structural engineer?

Absolutely — we routinely integrate beam sizes, padstones and foundation notes.

How long does it take?

We’ll confirm timelines with your quote, factoring design iteration and council determination.