House Extension in Chiswick
Create more space, light and value—without the stress. As Chiswick’s trusted extension specialists, KT5 Construction delivers a smarter, cost-effective way to expand your home. From first ideas to final handover, we plan carefully, price transparently and engineer specifications to make your budget go further—so you get the room you need and a finish you’re proud of.
At KT5, clear communication is everything. We keep you fully informed at each stage to make sure 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 Chiswick: What to Expect from Local Experts
Why Choose KT5 for Your Chiswick Extension
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Neighbourhood insight – We understand Chiswick’s housing mix—Victorian/Edwardian terraces, Arts & Crafts villas and modern apartments—and design extensions that maximise space while respecting street character and conservation sensitivities.
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Single accountable team – One partner for design, permissions, build and finishing.
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Fixed costs, clear programme – Agreed scope, transparent schedule, regular progress updates.
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Value engineering – Smarter specs that stretch budgets without compromising quality, safety or longevity.
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Aftercare mindset – We build for long-term performance, not short-term fixes.
Extensions We Build Around Chiswick
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Single-storey rear kitchen/dining extensions that open to the garden with wide sliders and rooflights.
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Side-return and wrap-around layouts to unlock family living space in period terraces.
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Double-storey additions for extra bedrooms, ensuites and integrated storage.
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Loft conversions and dormers that maximise attic footprints and daylight.
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Garden rooms/orangeries for flexible home-office, wellness or studio space.
Every project is planned with neighbour relations, party wall matters and local design cues in mind—ideal for established streets and conservation areas.
Our Value-First Approach
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Budget clarity – Fixed-price contracts to protect against hidden extras.
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Specification smarts – Balanced recommendations for aesthetics, performance and lifecycle cost.
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Transparent comms – Detailed programmes, site updates and clear payment schedules.
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Quality control – Sequenced inspections and robust snagging before handover.
How Your Chiswick Extension Comes to Life
Initial Consultation & Free Design Offer
We start with a home or video visit to understand your goals, budget and timeline. Choose KT5 as your builder and we’ll include free architectural/structural design to get your scheme moving from day one.
Planning, Permissions & Building Control
We manage permitted development checks, planning applications, 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 groundworks 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 Chiswick Homeowners Trust KT5 Construction
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Deep experience across West London period homes
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No-surprise pricing and clear payment schedules
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Rated for punctuality, communication and detail
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Smart, durable solutions that add real value
Shape Your Chiswick Home’s Next Chapter
Ready to plan a House Extension in Chiswick that’s on time and on budget? KT5 Construction is here to help. Book your free consultation to discover how we can save you time, money and stress—while building the home you’ve always wanted.
Frequently Asked Questions
How much does a Chiswick house extension cost?
Costs vary by size, design, 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 higher-end finishes and glazing
We provide fixed pricing and can phase works to align with your budget.
Do I need planning permission for an extension in Chiswick?
Many single-storey rear or modest loft schemes can fall under Permitted Development, but properties in conservation areas or with previous alterations may require full planning. We’ll check constraints, advise the best route and handle all submissions.
How long does an extension take?
A typical single-storey rear extension takes 10–16 weeks on site once design and approvals are complete. Double-storey or complex schemes may take longer. We’ll give you a clear programme and regular updates.
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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