House Extension in Hillingdon
As one of West London’s trusted extension specialists, KT5 Construction delivers a smarter, cost-effective way to expand your home in Hillingdon. From first ideas to final handover, we plan carefully, price transparently, and apply practical cost-saving strategies—so you can create the space you need without stress or overspending.
Clear, consistent communication is our standard. We keep you fully informed at every stage so your vision stays on track.
What We Do
Building Construction
New Builds, Extensions, Conversions, Renovations
General Building
Property Maintenance, Handyman Service, Decorating
Design
Planning, Design, Project Management, Quality Checking
House Extension in Hillingdon: What to Expect from Proven Specialists
Why Choose KT5 Construction for Your Hillingdon Project
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Local insight – We understand Hillingdon’s housing mix—1930s semis, inter-war and post-war terraces, detached homes and bungalows across Uxbridge, Ruislip, Ickenham, Hayes, Northwood and West Drayton—and tailor designs that maximise space while respecting your street’s character.
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One accountable team – Design, permissions, build and finishing managed under a single roof.
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Fixed costs, clear programme – No surprises: agreed scope, transparent payment schedule and regular progress updates.
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Value engineering – Smarter specifications that stretch your budget without compromising safety, quality or longevity.
Extensions We Deliver Across Hillingdon & Nearby Areas
Designed around the way you live—planned for quality, value and compliance in established residential streets:
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Single-storey rear kitchen/dining extensions
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Side-return and wrap-around layouts to unlock family living space
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Double-storey additions for extra bedrooms and bathrooms
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Loft conversions and dormers to maximise roof space
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Garden rooms and orangeries for flexible work-from-home or leisure space
Our Value-First Approach
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Budget clarity – Fixed-price contracts that protect you from hidden extras
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Specification smarts – Options that balance aesthetics, performance and lifecycle cost
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Transparent comms – Detailed programmes, site updates and clear payment milestones
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Aftercare mindset – We build for long-term performance, not short-term fixes
How Your Extension Moves From Idea to Keys
Discovery Consultation & Free Design Offer
We start with a home or video visit to understand goals, budget and timeframe. Choose KT5 as your builder and we’ll include architectural and structural design to get your scheme moving from day one (terms apply).
Planning, Checks & Approvals
We handle permitted development reviews, planning applications where required, party wall coordination and building control approvals—streamlining the paperwork so you don’t have to.
Construction & Project Management
Your dedicated site manager coordinates trades, inspections and quality checks—from groundwork and structure to electrics, plumbing and finishes—so your extension is delivered safely, neatly and to a high standard.
Client Testimonials
“You made it so simple” – Just wanted to say thank you for making what I thought would be a difficult process much easier than I had imagined.
Thank you for my brand new house! The refurbishment and attention to detail makes it feel like a brand new house, but without the expensive cost of moving.
Just wanted to thank you for the work carried out to my new bathroom, I will definitely be in touch shortly to talk about my proposed kitchen extension.
Why Hillingdon Homeowners Choose KT5
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Local experience across Hillingdon and wider West London
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No-surprise pricing with clear payment schedules
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Rated for punctuality, service and attention to detail
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Smart, long-term solutions that add real value
Plan Your House Extension in Hillingdon with Confidence
Ready to create more space without the stress? If you’re planning a House Extension in Hillingdon that must be delivered on time and on budget, KT5 Construction is here to help. Book a free consultation to see how our fixed-price, design-and-build approach saves money, protects timelines, and brings your vision to life—beautifully.
Explore KT5 Construction or learn more about House Extension in Hillingdon.
Frequently Asked Questions
How much does a Hillingdon house extension cost?
Costs vary by size, design complexity, and specification. As a guide:
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£1,800–£2,500 per m² for well-specified standard builds
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£2,800+ per m² for high-spec finishes or complex structures
We provide fixed pricing and can phase works to suit your budget.
Do I need planning permission for an extension in Hillingdon?
Many single-storey rear extensions fall under Permitted Development, subject to limits on height, depth and materials. Homes in conservation areas or flats typically require full planning. We confirm the route, prepare drawings and manage applications where needed.
How long does an extension take?
Typical timelines (subject to scope and season):
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Single-storey: ~10–16 weeks
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Double-storey / structural reconfiguration: ~16–28 weeks
Your programme will be agreed up-front and updated throughout the build.
Our Services
House Extensions
KT5 Construction provides professional house or Property Renovations Services in Ash, tailored to your unique needs. Whether you’re expanding your kitchen or creating an open-plan living area, we deliver high-quality results.
Kitchen Refurbishment
At KT5 Construction, we are specialists in kitchen refurbishment in Surrey and surrounding areas, delivering bespoke designs that enhance your living space and add value to your home.
Loft Conversions
At KT5 Construction, we specialise in creating stunning loft conversions in Surrey that add space, value, and style to your home. From dormer loft conversions to luxury loft designs, our expert team handles every detail with professionalism and precision.
Groundworks
At KT5 Construction, we pride ourselves on being the go-to groundwork Company in London, delivering top-quality services for residential and commercial projects.
Bathroom Design & Installation
Your bathroom should be more than just functional—it should reflect your personal style and offer a space to unwind. At KT5 Construction, we specialise in Surrey bathroom design and installation, delivering tailored solutions that blend elegance, practicality, and luxury.
Property Refurbishment
Our Ewell Road Surbiton Project showcases the full spectrum of our refurbishment expertise. By managing every detail, from architectural consultation to final finishes, KT5 ensures each element meets the highest standards.
New Build Homes
As a trusted New Build Builder in Surrey, KT5 Construction has been at the forefront of creating bespoke, high-quality homes designed to meet modern living standards.
Architecture & Design
Expert architectural planning & creative design solutions for residential and commercial projects in Surrey & London.
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