House Extension in Croydon
Create the extra space you need—minus the stress. For your House Extension in Croydon, KT5 Construction delivers a smarter, cost-effective design & build from first ideas to handover. With careful planning, transparent pricing, and value-driven specs, we add light, storage, and liveable space—on time and on budget.
Communication is at the heart of KT5. We keep you updated at every stage so your vision stays on track and surprises stay off site.
What We Do
Building Construction
New Builds, Extensions, Conversions, Renovations
General Building
Property Maintenance, Handyman Service, Decorating
Design
Planning, Design, Project Management, Quality Checking
Croydon Extensions, Done Right: What to Expect
Why Choose KT5 Constructions for Your Croydon Project?
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Local know-how – We understand Croydon’s mix of Victorian/Edwardian terraces, 1930s semis, and post-war homes—from Addiscombe and South Croydon to Purley and Thornton Heath—so designs maximise space while fitting your street’s character.
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End-to-end delivery – One accountable team handling design, permissions, build, and finishing.
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Fixed costs, clear programme – An agreed scope, realistic schedule, and milestone updates keep everything predictable.
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Value engineering – Smart specifications that stretch your budget without compromising safety, durability, or finish quality.
Extensions We Deliver Across Croydon
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Single-storey rear extensions for open-plan kitchen/dining spaces
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Side-return or wrap-around layouts to unlock family living
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Double-storey additions for extra bedrooms, bathrooms, and storage
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Loft conversions & dormers to make the most of your roof volume
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Garden rooms & orangeries for flexible office, studio, or leisure space
Every project is carefully planned to deliver quality, value, and compliance in established residential streets.
How We Safeguard Your Budget
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Budget clarity – Fixed-price contracts to protect against hidden extras
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Specification smarts – Options that balance aesthetics, performance, and lifecycle cost
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Transparent comms – Detailed programme, site updates, and clear payment schedule
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Aftercare mindset – We build for long-term performance, not short-term fixes
How the Process Works
Discovery Visit & Free Design Pack
We start with a home or video visit to understand your goals, layout ideas, 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, Permissions & Compliance
We manage permitted development checks, planning applications, party wall matters, Thames Water build-over approvals (where relevant), and building control—streamlining paperwork so you don’t have to.
Build & Project Delivery
Your dedicated site manager coordinates trades, inspections, and quality checks—from groundwork and structure through to electrics, plumbing, and finishes—so your extension is delivered safely, neatly, and to the standard you expect.
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 Croydon Homeowners Choose KT5 Construction
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Proven experience across Croydon and wider South London
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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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Practical, long-term solutions that add real value
Bring Your Croydon Extension to Life
Ready to create more room to live, work, and relax? Book a free consultation and discover how we can save you time, money, and stress—while building the home you’ve always wanted.
Start with KT5 Construction or explore more about a House Extension in Croydon.
Frequently Asked Questions
How much does a Croydon 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 Croydon?
Many extensions fall under Permitted Development if they meet specific size and design limits. If full planning is needed, we’ll prepare and submit the application, manage any neighbour consultations, and coordinate with Croydon Council. We’ll also handle building control approvals.
How long does an extension take?
Typical durations (from start on site):
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Single-storey rear/side-return: ~10–16 weeks
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Wrap-around or double-storey: ~16–24 weeks
Timelines depend on site conditions, scope, and specification; we’ll confirm your programme at proposal stage.
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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