House Extension in Sunbury on Thames
Create more space without the stress. As one of London and Surrey’s trusted extension specialists, KT5 Construction delivers a smarter, cost-controlled route to your House Extension in Sunbury on Thames. From early concepts to handover, we blend meticulous planning, transparent pricing and practical value-engineering—so you get the room you need without overspending or delays. Learn more about our wider extension service here: House Extension in Sunbury on Thames.
At KT5 Construction, clear communication underpins everything. You’ll get regular updates, set milestones, and one accountable team from start to finish.
What We Do
Building Construction
New Builds, Extensions, Conversions, Renovations
General Building
Property Maintenance, Handyman Service, Decorating
Design
Planning, Design, Project Management, Quality Checking
Sunbury-on-Thames Extensions: What You Can Expect
Why Choose KT5 Constructions for Your Sunbury Project
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Local insight that saves time – We understand Sunbury’s mix of 1930s semis, riverside cottages and post-war homes. We design to maximise light and space while respecting the character of Lower Sunbury and surrounding streets.
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Single, accountable team – Surveys, design, permissions, build and finishes—coordinated by us.
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Fixed-price proposals & clear programmes – No guesswork; just an agreed scope, schedule and staged payments.
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Value-engineering built in – Smarter specs and build methods that protect budget without compromising safety, quality or longevity.
Extensions We Deliver in Sunbury & Nearby
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Single-storey rear kitchen/dining extensions for open-plan living
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Side-return and wrap-around schemes to unlock awkward plots
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Double-storey additions for extra bedrooms, ensuites and utility space
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Loft conversions and dormers to maximise the roof volume
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Garden rooms/orangeries for home-office, leisure or studio use
Every project is planned around your property’s context—neighbours, access, utilities and (where relevant) riverside considerations.
Our Value-Led Build Method
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Budget clarity – Fixed pricing with transparent inclusions/exclusions
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Specification smarts – Options that balance aesthetics, performance and lifecycle cost
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Proactive communication – Detailed programmes, site reports and predictable payment schedules
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Aftercare mindset – Durable details and documentation that make ownership easy
How Your Sunbury Extension Comes Together
Discovery & Complimentary Concept Start
We begin with a home or video consultation to map goals, budget and timelines. If you appoint KT5 as your builder, we include complimentary architectural/structural input to move your scheme forward from day one.
Planning, Permissions & Compliance
We handle permitted development checks, planning submissions, party wall coordination and building control. Where relevant, we also advise on utilities/build-over agreements and flood-risk considerations—so paperwork doesn’t slow progress.
Construction & Programme Control
Your dedicated site manager orchestrates trades, inspections and quality checks—from groundwork and structure to MEP and finishes—delivering a clean, safe and well-managed build.
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 Sunbury Homeowners Choose KT5 Construction
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Proven local experience across Sunbury and wider Surrey
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No-surprise costs and structured payment schedules
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Rated for punctuality, communication and attention to detail
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Designs and specifications that add genuine long-term value
Start Your House Extension in Sunbury on Thames Today
Ready to create more space—on time and on budget? Book a free consultation with KT5 Construction and discover how our proven process for House Extension in Sunbury on Thames saves time, money, and stress while delivering a high-quality finish. Explore our full approach here: House Extension in Sunbury on Thames.
Frequently Asked Questions
How much does a Sunbury-on-Thames 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 Sunbury?
Many single-storey rear extensions fall under Permitted Development, but constraints (heights, depth, materials, conservation, flood-risk areas) still apply. We’ll confirm your route—PD or full planning—and manage the application and building control for you.
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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