House Extension in Ashtead
As one of Surrey and London’s trusted extension specialists, KT5 Construction delivers a smarter, cost-effective way to expand your home in Ashtead. From first ideas to final handover, we combine careful planning, transparent pricing, and practical cost-saving strategies—so you can create the space you need without stress or overspending. Learn more about KT5 Construction.
At KT5, 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
House Extension in Ashtead: What to Expect from Trusted Experts
Why Choose KT5 Constructions for Your Ashtead Extension?
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Local know-how – We understand Ashtead’s property mix—detached family homes, 1930s/1950s semis, bungalows, and modern cul-de-sacs—and tailor designs that maximise space while respecting local character near Ashtead Common and village streets.
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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—just an agreed scope, a transparent schedule, and regular progress updates.
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Value engineering – Smarter specifications that stretch your budget without compromising safety, quality, or longevity.
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Neighbour-friendly sites – Clean, considerate working and proactive liaison to minimise disruption.
Proven Track Record Across Ashtead & Surrounding Areas
We build a wide range of extensions tailored to local property types and lifestyles:
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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 attic footprint
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Garden rooms/orangeries for home-office or leisure space
Every project is carefully planned to deliver quality, value, and compliance in established residential streets across Ashtead, Leatherhead, Fetcham, and Epsom.
Our Value-First Approach
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Budget clarity – Fixed-price contracts to protect against hidden extras
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Specification smarts – Recommendations that balance aesthetics, performance, and lifecycle costs
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Transparent comms – Detailed programmes, site updates, and clear payment schedules
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Aftercare mindset – We build for long-term performance, not short-term fixes
Double-storey house extension by KT5 Construction.
Custom kitchen refurbishment in Surrey with an elegant island and premium finishes.
Rear house extension featuring sliding glass doors.
Understanding the Extension Process
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 & Permission
We handle 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 groundwork and structure to electrics, plumbing, and finishes—so your extension is delivered safely, neatly, and to the highest 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 Ashtead Homeowners Trust KT5 Construction
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Local experience across Ashtead 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 Build the Space You Deserve
Ready to plan a House Extension in Ashtead 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 an Ashtead house extension cost?
Costs vary by size, design, and specification. As a guide:
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£1,800–£2,500 per m² for standard builds
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£2,800+ per m² for high-spec finishes
We provide fixed pricing and can phase works to suit your budget.
Do I need planning permission for an extension in Ashtead?
Many extensions fall under Permitted Development, but this depends on size, location, and previous alterations. We’ll confirm PD eligibility, prepare drawings, and submit any required planning applications, party wall notices, and building control documentation.
How long does an extension take?
Typical timelines:
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Single-storey: ~10–16 weeks (design to completion)
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Double-storey/complex schemes: ~16–24+ weeks
Programme length depends on scope, structural needs, finishes, and access.
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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