House Extensions Builders London
As one of the most trusted House Extension Builder London, KT5 Construction takes a smarter, more flexible approach to building, extensions, and renovations. We offer expert planning, transparent pricing, and smart cost-saving strategies to help you bring your dream project to life—without breaking the bank.
Communication is key to what we do.
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 Extensions Builders London: What to Expect from Trusted Experts
Why Choose KT5 Construction for Your London House Extension?
Proven Track Record Across London Boroughs
From Richmond to Clapham, we’ve successfully delivered a wide range of home 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
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Each project is managed by skilled professionals who understand the nuances of building in London’s dense urban settings—from neighbourly considerations to planning constraints.
Our Value-First Approach
At KT5, we know cost is a key factor for homeowners. That’s why we offer:
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Value engineering to maximise your budget without compromising on quality
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Fixed-price contracts to keep you protected from cost overruns
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We don’t just build—we help you plan, save, and stay informed every step of the way.
Understanding the House Extension Process
Step-by-Step Extension Services from KT5 Construction
1. Initial Consultation & Free Design Offer
We start with a home visit or video consultation to assess your needs. Choose KT5 as your builder, and we’ll include free architectural or structural designs—helping you save from the very beginning.
2. Planning & Permission
Our in-house team guides you through local authority planning, permitted development checks, and building regulations. With London’s complex borough rules, it pays to have experts on your side.
3. Construction & Project Management
Once approvals are secured, our dedicated site managers oversee every phase—from groundwork and first fix to finishes and sign-off.
Why London Homeowners Trust KT5 Construction
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Local experience across boroughs like Kingston, Ealing, and Wandsworth
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Clear communication and no-surprise pricing
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Trusted by middle-class homeowners who want smart investments, not guesswork
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Transparent quotes and payment schedules
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Rated for quality, punctuality, and customer service
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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.
FAQs: House Extensions in London
1. How much does a house extension in London cost?
Costs vary based on size, design, and location. However, you can expect:
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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
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KT5 offers fixed pricing and options to phase works in line with your cash flow.
2. Do I need planning permission for an extension in London?
It depends. Some extensions fall under permitted development. We’ll handle all planning queries and applications where needed.
3. How long does a house extension take?
Most extensions take 10–16 weeks, depending on scope and weather. We offer detailed programmes so you can plan ahead with confidence.
Let’s Build the Space You Deserve
Looking for house extensions builders in London who understand your needs, your area, and your budget? KT5 Construction is here to help. Book your free consultation today and find out how we can save you time, money, and stress—while building the home you’ve always wanted.
Positive Approach
Be flexible and react quickly to changing demands in order to understand and deliver over and above the clients expectations.
Communication
Management input on a day to day basis and regular client contact ensures problem free contract delivery which is built around the client’s needs and expectations.
Attention To Detail
We take time with our clients during the tender and procurement stage to make sure the small details are thought of and dealt with, making the build process easier.
Delivery
Throughout the project we will update our customers on when their project will be finished, our company ethos is “On Time & On Budget”
Why KT5 Construction?
We Work With You
KT5 works with you on your project, large or small, making sure that we deliver your new project to the high standard you can expect to receive.
25 years’ Experience
You can relax knowing that your project is being managed by a knowledgeable, experienced team.
Quality Focused
Quality and design with our customers in mind. We pride ourselves on using the most modern building techniques and the skilled people.
YEARS OF EXPERIENCE
Completed Projects
Contact Us
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