House Extension in Mitcham
Create the space you’ve been dreaming of—without the stress. As established extension specialists serving Mitcham and the wider Merton area, KT5 Construction blends thoughtful design, clear pricing, and tidy delivery so your House Extension in Mitcham adds real value to your home and lifestyle. From first ideas to final handover, you’ll have one accountable team, one programme, and zero guesswork.
We take communication seriously—expect regular updates, clean sites, and decisions made with you, not for you.
What We Do
Building Construction
New Builds, Extensions, Conversions, Renovations
General Building
Property Maintenance, Handyman Service, Decorating
Design
Planning, Design, Project Management, Quality Checking
Your Mitcham Extension, Done Right
Why choose KT5 for your Mitcham project?
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Local insight that fits your street: From 1930s semis and post-war terraces to homes near Cricket Green and Figges Marsh, we tailor designs that maximise space while respecting the character of your road.
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One team from concept to completion: Surveys, drawings, permissions, build and finishes—streamlined by a single, accountable contractor.
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Predictable budgets and programme: Transparent scopes, fixed-price options, and a live schedule you can track.
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Budget-savvy specification: Value-engineered solutions that protect performance, safety and longevity—without overspend.
Learn more about us at KT5 Construction.
Extensions We Deliver Across Mitcham & Nearby
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Single-storey rear kitchen/dining extensions
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Side-return and wrap-around layouts for open-plan family living
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Double-storey additions for extra bedrooms and baths
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Loft conversions and dormers to unlock your roof space
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Garden rooms/orangeries for home office or leisure
Every build is planned for quality, compliance and neighbourly working—important in terraced streets and conservation settings across Merton.
Our Value-First Approach
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Cost clarity: Fixed-price contracts and staged payments—no surprises
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Smart specs: Materials and systems chosen for performance, aesthetics and lifecycle cost
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Open comms: Detailed programmes, site updates and clear approvals process
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Built-in aftercare: We plan for durability, access and maintenance from day one
How the Process Works
Consultation & Free Design Offer
We start with a home or video visit to understand goals, budget and timeline. If you appoint KT5 as your builder, we include free architectural/structural design to move your scheme forward quickly and correctly.
Planning, PD & Approvals
We manage permitted development checks, planning applications with Merton Council, party wall matters and building control—keeping paperwork simple and compliant.
Construction & Site Management
Your dedicated site manager coordinates trades, inspections and quality checks from groundworks to finishes—safe, tidy, 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 Mitcham Homeowners Pick KT5 Construction
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Proven experience across Mitcham and wider South-West London
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No-surprise pricing and clear payment stages
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Rated for punctuality, service and neat workmanship
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Long-term, low-maintenance solutions that boost value
Kick-Start Your House Extension in Mitcham
Ready to plan a House Extension in Mitcham that’s delivered on time and on budget? Book your free consultation and discover how KT5 Construction’s design-and-build approach reduces costs, streamlines approvals, and delivers a high-quality finish—so you get the space your family needs, faster.
Explore your options here at House Extension in Mitcham
Frequently Asked Questions
How much does a Mitcham 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 in Mitcham?
Many extensions fall under Permitted Development; others need full planning, especially in conservation areas or for larger schemes. We’ll confirm your route, handle applications, 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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