House Extension in Cobham
Create the space your family needs without the stress. As Surrey-based extension specialists, KT5 Construction delivers a smarter, cost-effective way to extend your Cobham home—from first ideas to final handover. Expect careful planning, transparent pricing, and practical cost-saving strategies that protect your budget and your timeline.
At KT5, clear communication is everything. We keep you 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 Cobham: What to Expect from Trusted Experts
Why Choose KT5 Construction for Your Cobham Extension?
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Local insight – We understand Cobham’s housing stock—from detached family homes and 1930s semis to bungalows and cottages—and design solutions that maximise space while respecting neighbourhood character and conservation sensitivities.
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End-to-end delivery – One accountable team for design, permissions, build, and finishing.
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Fixed costs, clear programme – No surprises: an agreed scope, transparent schedule, and regular, plain-English updates.
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Value engineering – Smart specifications that stretch your budget without compromising safety, quality, or longevity.
Extensions We Build Across Cobham & Nearby Areas
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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 roof space
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Garden rooms/orangeries for flexible home office or leisure
Every project is planned for quality, value, and compliance—ideal for established residential streets in Cobham, Stoke d’Abernon, Oxshott, and Esher.
Our Value-Led Approach
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Budget clarity – Fixed-price contracts that protect against hidden extras
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Specification smarts – Recommendations balancing style, performance, and lifecycle cost
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Transparent comms – Detailed programmes, site updates, and clear payment schedules
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Aftercare mindset – Built for long-term performance, not short-term fixes
How Your Cobham Extension Takes Shape
Discovery & Early Design
We start with a home or video visit to understand goals, budget, and timescales. If you appoint KT5 for the build, we’ll include architectural and structural design as part of our delivery, helping you move from concept to approved drawings swiftly.
Planning, Permissions & Building Control
We manage permitted development checks, planning submissions where required, party wall coordination, and building control approvals—streamlining 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 neatly, safely, 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 Cobham Homeowners Choose KT5 Construction
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Local experience across Cobham and wider Surrey
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No-surprise pricing and clear payment schedules
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Rated for punctuality, communication, and attention to detail
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Practical, long-lasting solutions that add real value
Let’s Unlock the Space in Your Home
Ready to plan a House Extension in Cobham that’s on time and on budget? KT5 Construction is here to help. Explore who we are at KT5 Construction and learn more about our extension service via House Extension in Cobham. 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 Cobham 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 Cobham?
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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