House Extension in Leatherhead
Create the extra room you’ve been dreaming of—without the stress. As one of Surrey’s trusted extension specialists, KT5 Construction delivers a smarter, cost-effective way to expand your home in Leatherhead. From first ideas to final handover, we combine meticulous planning, transparent pricing, and value-engineering—so you get more space, better flow, and lasting quality.
At KT5 Construction, clear communication is everything. We keep you informed at every stage to ensure 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
Leatherhead Extensions: What Sets Us Apart
Why choose KT5 for your Leatherhead project?
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Local insight – We understand Leatherhead’s mix of period cottages, 1930s semis and modern family homes, and tailor designs to maximise space while respecting street character and local policy.
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End-to-end delivery – One accountable team for design, permissions, build and finishing.
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Fixed costs & clear programmes – No surprises—just agreed scope, transparent schedule and frequent updates.
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Value-engineering – Smarter specifications that stretch your budget without compromising safety, quality or longevity.
Projects We Deliver in Leatherhead & Nearby
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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 make the most of your roofspace
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Garden rooms/orangeries for flexible work, wellness or play
Every project is planned for quality, compliance and neighbourly construction in established residential streets.
How We Keep Quality High and Costs Sensible
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Budget clarity – Fixed-price contracts and itemised scopes to protect against hidden extras.
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Specification smarts – Recommendations balancing aesthetics, performance and lifecycle cost.
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Transparent comms – Detailed programmes, site updates and clear payment stages.
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Aftercare mindset – We build for long-term performance, not short-term fixes.
From Idea to Keys: Our 3-Step Process
Consultation & Starter Design (Free when you build with us)
We begin 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
We handle permitted development checks, planning applications, party wall matters and building control approvals—streamlining the paperwork with Mole Valley District Council so you don’t have to.
Build, Manage & Handover
Your dedicated site manager coordinates trades, inspections and quality checks—from groundwork and structure to electrics, plumbing and finishes—delivering a safe, tidy site and a superb finish.
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 Leatherhead Homeowners Choose KT5 Construction
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Local experience across Leatherhead and wider Surrey
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No-surprise pricing and 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
Let’s Plan Your Space
Ready to start a House Extension in Leatherhead that’s on time and on budget? Book your free consultation with KT5 Construction 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 Leatherhead 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 Leatherhead?
Many extensions fall under Permitted Development, but it depends on size, position and past alterations. We’ll confirm PD potential, manage any Mole Valley planning application, and liaise with Building Control.
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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