House Extension in Coulsdon
Planning a House Extension in Coulsdon? KT5 Construction—South London’s trusted specialists—deliver cost-effective, design-led builds. From concept to handover, we use meticulous planning, transparent pricing, and value engineering to keep your project on time and on budget.
At KT5, communication is key. Expect clear updates, tidy paperwork, and one accountable team from day one.
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 Coulsdon: How We Deliver It Right
Why Choose KT5 Constructions for Your Coulsdon Extension?
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Local insight – We understand Coulsdon’s housing mix—inter-war semis, 1930s/1950s detached homes and bungalows—and tailor designs that maximise space while complementing your street scene in areas like Old Coulsdon, Chipstead Valley and Purley borders.
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End-to-end delivery – One experienced team handling concept, planning, structural design, build and finishing.
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Fixed costs & clear programme – Agreed scope, realistic timelines and regular progress reporting—no surprises.
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Value engineering – Smarter specifications that stretch your budget without compromising safety, quality or durability.
Extensions We Commonly Build Across Coulsdon & Nearby
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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 the roof space
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Garage conversions for practical, cost-efficient floor area
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Garden rooms/orangeries for home office, studio or playroom flexibility
Every scheme is carefully planned to deliver quality, value and compliance within established residential streets.
Our Value-First Approach
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Budget clarity – Fixed-price contracts and transparent valuations protect you from hidden extras.
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Specification smarts – Recommendations that balance aesthetics, performance and lifecycle cost.
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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.
What to Expect in an Extension Process
Consultation & Free Design Kick-Start
We begin 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 move your scheme forward from day one.
Planning & Approvals
We manage permitted development checks, planning submissions (where required), 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 groundworks and structure to electrics, plumbing and finishes—so your extension is delivered safely, neatly 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 Coulsdon Homeowners Trust KT5 Construction
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Local experience across Coulsdon and wider Surrey/London borders
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No-surprise pricing with clearly phased 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
Build the Space That Fits Your Future
Ready to plan a House Extension in Coulsdon that’s on time and on budget? Explore our service overview here: House Extension in Coulsdon and learn more about us at KT5 Construction. 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 Coulsdon 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 Coulsdon?
Many single-storey rear extensions fall under Permitted Development if they meet specific rules. Larger or double-storey schemes generally require planning permission from Barnet Council. We’ll confirm your route and manage applications for you.
How long does an extension take?
Typical ranges (subject to design, access and specification):
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Single-storey: ~10–16 weeks
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Double-storey: ~16–24 weeks
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Loft conversion: ~8–12 weeks
A detailed programme is issued before work begins.
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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