Single & Double Storey | Rear Extensions | Side Returns | Full Project Management
Professional house extensions across Milton Keynes and 30-mile radius. From design to completion, we manage every aspect of your extension project.
£1,200-1,800 per m²
£1,500-2,200 per m²
£25,000-45,000 typical
£20,000-60,000 typical
£50,000-100,000+ typical
Custom quote per project
Architectural drawings, planning applications, building regulations
Single point of contact, coordinating all trades
Builders, electricians, plumbers, plasterers, decorators
All work guaranteed, insurance-backed warranty available
Single-storey extensions: £1,200-1,800 per m². Double-storey: £1,500-2,200 per m². A typical 15m² single-storey extension costs £18,000-27,000. We provide detailed fixed-price quotes.
Many extensions fall under permitted development rights. We can advise on your specific project and handle all applications if required.
Single-storey: 8-12 weeks. Double-storey: 12-16 weeks. Timeline depends on size, complexity, and planning requirements.
We cover Milton Keynes and 30-mile radius including Northampton, Bedford, Aylesbury, Buckingham, Luton, and all surrounding towns.
Real photos are one of the biggest ranking and conversion drivers for property work. Drop your own job photos into /images/ and replace the placeholders below (same filenames) to instantly upgrade trust.
Extensions are a serious investment, so your page needs to prove you’re not a “cowboy with a ladder”. We do structured planning, clear scope, and disciplined project management so you know what’s happening and what it will cost.
Timelines vary, but most single-storey projects run 8–14 weeks depending on design and supply lead times. We’ll advise a realistic schedule after an on-site assessment.
Extensions are more disruptive than loft conversions because they connect directly into the living space. The best way to reduce stress is planning: decisions made early prevent delays later.
We protect floors and key access routes, keep the site tidy, and communicate each stage so you know what’s next.
Customers often see “£X per m²” online — but real projects vary hugely. Here are the biggest cost drivers:
As a guide, many Milton Keynes extensions start from £35,000+ for simpler builds and can rise depending on structure and finish level. The right next step is a site visit to understand layout, access, and your goals.
The most popular extension request we get is simple: make the kitchen bigger and create a bright open-plan living space. The extension itself is only half the job — the big transformation often comes from opening up the existing rear wall and redesigning flow.
If you share a few photos and rough measurements, we can usually tell you the best approach before a site visit.
Natural light is what makes an extension feel “expensive”. Door and roof-light choices massively affect both cost and the final look.
Great for opening up in summer and connecting the kitchen to the garden. Costs vary by size, brand and glazing spec.
Often give a cleaner frame profile and can suit modern designs, especially for wider openings.
A roof lantern can transform a rear extension by flooding the centre of the room with light — a popular choice in Milton Keynes homes.
Some extensions can be built under permitted development, but many still require planning approval depending on size, proximity to boundaries, and the type of property. Even when planning isn’t required, the build must comply with building regulations for structure, thermal performance, electrics, drainage and safety.
We’ll explain the route that makes sense for your home during the quote stage, so you know what’s involved before work starts.
“Extension” can mean anything from a modest kitchen bump-out to a full wrap-around that transforms the ground floor. The right choice depends on your plot size, the existing layout and the outcome you want (bigger kitchen, open-plan living, utility room, extra bedroom, etc.).
Perfect for opening up the back of the home. Often used for kitchen-diners with large doors to the garden. Great impact for the footprint.
Ideal if you have a side alley or unused space. Commonly used to widen cramped kitchens, add a WC, or create a utility.
Combines rear + side for maximum space. Higher cost, but often delivers the “new house” feel without moving.
If you want, we can also price the job as fixed scope (where appropriate) so you can budget properly.
Do you cover structural work?
Yes — and we’ll advise where specialist engineering input is needed.
Can you match existing brickwork?
We’ll source materials to match as closely as possible and plan joins carefully.
Do you handle electrics/plumbing?
Yes — coordinated as part of the project so you’re not juggling multiple trades.
If you’re comparing options or need a fast quote, these pages can help you plan and book.
Extensions go wrong when quotes are vague and assumptions are made. A trustworthy quote clearly states what’s included, what’s excluded, and how changes are handled.
Urban Gate focuses on clear quoting and consistent project management so you get the space you want without chaos.
The “wow factor” in an extension is rarely the brickwork — it’s the finishing. Straight plaster lines, crisp paintwork, tidy silicone, well-fitted doors, and a clean handover. This is also where poor builders cut corners.
We build snagging time into the plan and walk the project with you at the end so small issues get resolved properly. If you’re investing in a new kitchen or premium doors, finishing quality isn’t optional — it’s what protects your investment.
Book a free consultation to discuss your extension project