House Extension Builders London
As one of the most trusted names in House Extension projects across London, KT5 Constructions offers homeowners a smarter, cost-effective way to expand and transform their living space. With expert planning, transparent pricing, and innovative cost-saving strategies, we make it possible to create your dream home without unnecessary stress or overspending.
At KT5, communication is at the heart of everything we do—we keep you informed at every step, 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 London: What to Expect from Trusted Experts
Why Choose KT5 Construction for Your House Extension in London?
Proven Track Record Across London Boroughs
From Richmond to Wandsworth, we’ve successfully delivered a wide range of house extension projects, including:
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Single-storey rear extensions
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Wrap-around kitchen extensions
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Double-storey builds
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Loft conversions and dormers
Our team of specialists understand the challenges of London builds—from strict planning regulations to maximising space in dense urban settings. Every project is carefully managed to deliver quality, value, and compliance.
Our Value-First Approach
At KT5, we know that cost is always front of mind. That’s why we provide:
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Value engineering to stretch your budget without cutting corners
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Fixed-price contracts for peace of mind and protection against hidden costs
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Clear communication and detailed programmes so you can plan confidently
We don’t just build; we guide you through the process, helping you save time and money while avoiding common pitfalls.
Understanding the House Extension Process
Step-by-Step Services from KT5 Construction
1. Initial Consultation & Free Design Offer
We begin with a home visit or video consultation to understand your goals. When you choose KT5 as your builder, we include free architectural or structural designs—helping you save from day one.
2. Planning & Permission
Our in-house experts handle everything from permitted development checks to full planning applications. With London’s complex borough requirements, having a local specialist ensures a smoother approval process.
3. Construction & Project Management
Once planning is secured, our site managers oversee all stages—from groundwork to finishing touches—ensuring your extension is completed 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 London Homeowners Trust KT5 Construction
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Local experience in boroughs including Kingston, Ealing, and Wandsworth
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No-surprise pricing and transparent payment schedules
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Trusted by homeowners who value smart, long-term investments
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Rated for punctuality, customer service, and attention to detail
Let’s Build the Space You Deserve
Looking for trusted house extension builders in London who understand your needs, your area, and your budget? KT5 Constructions
is here to help. Book your free consultation today and discover how we can save you time, money, and stress—while building the home you’ve always wanted.
Learn more about our House Extension services
Frequently Asked Questions
How much does a house extension in London cost?
Costs vary by size, design, and location. 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
At KT5, we provide fixed pricing and can also phase works in line with your budget.
Do I need planning permission for a house extension in London?
It depends—some extensions fall under permitted development. We’ll advise and handle all applications where required.
How long does a house extension take?
Most extensions take 10–16 weeks, depending on scope and weather conditions. We provide clear programmes so you can plan ahead.
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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