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
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.
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.
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.
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...
| Included as Standard | Traditional Local Architect | Online-Only Architects |
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| Fixed, transparent pricing |  |
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| Unlimited design revisions | |
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| Immediate project start | |
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| 3D LiDAR property scanning | |
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| Local knowledge & planning expertise | |
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| Meet your designer face-to-face | |
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| Remote/online meetings available | |
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| Council submissions handled for you | |
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| Everything under one roof (Party Wall, Land Registry, CAD) | |
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| Personal, local service | |
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“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.
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.
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.
Quick Links
Get In Touch
Building 13, Thames Enterprise Centre, Princess Margaret Road, East Tilbury, Essex, RM18 8RH
- Phone: 0800 494 7023
- Hours: Mon-Fri 8:30AM - 5:30PM
Get In Touch
Building 13, Thames Enterprise Centre, Princess Margaret Road, East Tilbury, Essex, RM18 8RH
- Phone: 0800 494 7023
- Hours: Mon-Fri 8:30AM - 5:30PM