More space, more value, designed, managed and delivered properly.
Transparent guide pricing
Realistic ranges based on typical projects around Milton Keynes. Your property survey turns the guide into a detailed fixed-price quotation.
20–30m²
Guide range£45,000 – £75,000
The most common project — opening the rear of your home to the garden. Typically includes foundations, block and brickwork, flat or pitched roof, windows and doors, insulation, electrics, plumbing first fix, plastering and decoration.
8–15m²
Guide range£28,000 – £48,000
Narrow side infill popular on Victorian and Edwardian terraces. Access constraints and party wall considerations often affect cost.
35–50m²
Guide range£75,000 – £120,000
Rear and side combined — maximum ground floor space for open-plan kitchen-diners. Higher structural complexity and longer programme.
Guide prices vary with access, condition, specification and structural requirements. Final pricing follows a free detailed survey.
Whether you need a single-storey rear extension, a side return or a full wrap-around, we manage every stage from foundations to final decoration — one company, one point of contact, no chasing trades.
Structural work, Party Wall agreements and Building Control are handled as part of our managed service.
The challenge
Extending your home is a major investment. These are the frustrations we hear from homeowners before they find a builder they can trust.
Extension projects involve weeks of work and multiple trades — when communication breaks down, homeowners are left chasing updates and fixing mistakes themselves.
A low headline figure often excludes foundations, steelwork, drainage, kitchen fit-out or Building Control — costs spiral once work begins.
Mismatched brickwork, wrong roof tiles, awkward room proportions and thermal bridges that cause damp and heat loss.
Discovering PD limits, neighbour objections or structural issues after you've committed — causing delays and redesign costs.
When each trade blames the last, defects get hidden behind plasterboard — and you're left with problems that surface years later.
Our approach
Quality Construction was built to solve exactly these problems — with systems, documentation and accountability at every stage.
From foundations and steelwork to bi-folds, kitchens and final decoration — one project manager, one programme, one standard.
We assess ground conditions, structure and access before quoting. Your price reflects real scope — not optimistic guesswork.
We sample existing brickwork and roof tiles, advise on proportions and ensure your extension looks like it was always part of your home.
We advise on Permitted Development, coordinate structural design and handle all Building Control submissions and inspections.
Before, during and after surveys with clear reporting — nothing progresses until the previous stage meets our standard.
Why choose us
Why homeowners across Milton Keynes, Northampton and Bedford choose us for extensions.
Extension types
The most popular way to open up your ground floor — kitchen, dining and living space to the garden.
Transform a narrow side alley into usable floor area — ideal for Victorian and Edwardian terraces.
Rear and side combined for maximum space — popular for open-plan kitchen-diners.
Add ground and first floor space in one project — bedrooms, bathrooms and living areas.
Designed around how you live — bi-folds, roof lanterns, utility rooms and premium finishes.
Our system
Every extension follows the same proven system — organised, documented and designed to protect your investment.
We visit your property, assess feasibility, take measurements and discuss your goals in detail.
A clear scope of works with programme, specifications and transparent pricing — no pressure to proceed.
Contracts, specifications and payment stages agreed before any work begins.
Your project manager coordinates all trades, materials and inspections throughout.
Completion survey, certificates and guarantees — plus an annual aftercare visit every year.
Quality control
Photographic survey documenting existing conditions, access routes and protection requirements before work starts.
Stage inspections at structural, first-fix and pre-plaster milestones — issues addressed before being covered up.
Completion survey confirming workmanship standards, testing results and snag-free handover.
We return every year for a complimentary aftercare inspection — checking the work, addressing minor touch-ups and giving you continued peace of mind long after completion.
Peace of mind
Regulations
Many rear and side extensions fall within Permitted Development, but limits apply to size, height and proximity to boundaries. We assess your property at survey and advise before you commit.
Permitted Development allows certain extension work without a full planning application. We never assume PD applies — we verify against your property, neighbours and local constraints.
All structural extension work must comply with Building Regulations — covering structure, fire safety, insulation, ventilation, drainage and electrical safety.
Avoid costly errors
Learn from the errors we see homeowners make — so your project runs smoothly from day one.
Designing a 6m rear extension without confirming Prior Approval or planning requirements can force costly redesigns.
Trees, clay soil, drains and access restrictions significantly affect groundworks — a survey reveals the true picture.
Quoting 'shell only' then adding kitchen, bi-folds and landscaping separately often costs more than an integrated quotation.
Work on or near shared walls requires proper notices — delays here can push programmes back by weeks.
No project management, no surveys, no documentation — the industry default. We built Quality Construction to be the opposite.
Use our Project Planner for a realistic guide price, or read our detailed cost guide — then book a free survey for a fixed quotation.
Many rear and side extensions fall under Permitted Development, but this depends on your property, location and size. We assess this at survey stage and advise clearly before any commitment.
A single-storey rear extension typically takes 8–14 weeks depending on size, structural works and finishes. We provide a detailed programme with your quotation.
Yes. We coordinate all Building Control submissions, inspections and completion certificates as part of our managed service.
We take samples and source the closest match available. Where exact matches aren't possible, we advise on sympathetic alternatives before work begins.
Why We're Different
Building work shouldn't be stressful. It should be exciting.
Most homeowners expect poor communication, hidden costs, missed deadlines and builders who disappear once the job is finished. We built Quality Construction to be the complete opposite.
Every project includes the following as standard.
Poor Communication
Dedicated Project Management
Regular updates from start to finish.
Hidden Costs
Fixed Detailed Quotations
Clear pricing with no surprises.
Builders Disappear After Completion
Annual Complimentary Aftercare
We return every year to inspect our workmanship.
Poor Workmanship
Multiple Quality Inspections
Every stage professionally inspected.
No Guarantees
Written Workmanship Guarantee
Complete peace of mind.
Poor Organisation
Structured Project Management
Everything planned and organised.
Multiple Contractors To Organise
Multi-Trade One Stop Solution
One company managing your entire project.
Builders Don't Respect Your Home
Clean & Professional Working Practices
Your home treated with care.
Delays & Missed Deadlines
Planned Project Scheduling
A clear programme from day one.
Poor Paperwork
Professional Documentation
Everything professionally recorded and supplied.
No Idea What's Happening
Before, During & Completion Surveys
Complete visibility throughout your project.
Different Trades Blame Each Other
One Dedicated Project Manager
One point of contact from start to finish.
Cheap Materials
Quality Products
Built to last.
Builders Never Return Calls
Responsive Customer Support
Fast, reliable communication.
Builders Cut Corners
Quality Without Compromise
Built properly the first time.
Feeling Like Just Another Customer
Customer Completion Gift
A small thank you for choosing us.
A fantastic job done on my property by Kyle and team. Highly recommend them for all roofing and guttering jobs. Also would like to add the great communication from start to finish. Thank you!
Kyle and the team did a great job today of cleaning my garage roof from moss and then painting a polymer waterproof coating onto the roof. The manufacturers 10 year guarantee for a single layer makes it an easy choice for fixing water ingress into a garage. Time will tell, but I have high expectations. All the rubbish generated was taken away so very pleased.
Kyle and his team at Quality Roofing were great, punctual, communicative, and reasonably priced. They removed our old solar heating panel, replaced the felt and tiles underneath, and disposed of the panel, all in under 90 minutes. Great service from a reliable team.
Kyle arrived quickly to look at a problem we had with an old Velux. He quickly set about repairing it and it is now working fine. We really appreciate his quick service. Highly recommended.
Get In Touch
Book a free property survey. We will assess your requirements, provide transparent pricing, and explain how our system works.
Building work shouldn't be stressful. It should be exciting.
Home Improvements & Property Repairs One trusted company for every aspect of your property.
