House Extension in Custom House
As one of London’s trusted extension specialists, KT5 Construction delivers a smarter, cost-effective house extension in Custom House (E16). From first ideas to handover, we combine careful planning, transparent pricing, and proven cost-saving strategies.
Communication is key—we keep you informed at every stage so your vision stays on track with no surprises. Learn more at KT5 Constructions.
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 Custom House: Build Smart, Build Once
Why Choose KT5 for Your Custom House Extension?
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Local know-how – We understand E16 housing stock—Victorian/Edwardian terraces, post-war homes, and modern apartments—and tailor designs that maximise space while respecting your street’s character.
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Single accountable team – One partner for design, permissions, build, and finishing ensures a smooth, coordinated programme.
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Fixed costs & clear programme – Agreed scope, transparent milestones, and regular updates—no guesswork.
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Value engineering – Thoughtful specifications that stretch your budget without compromising safety, quality, or longevity.
Explore typical options and build routes on House Extension in Custom House.
Extensions We Deliver Across Custom House & Nearby E16
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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 (where plot width allows)
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Double-storey additions for extra bedrooms and bathrooms
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Loft conversions and dormers to maximise attic footprint
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Garden rooms/orangeries for flexible home-office or leisure space
Every project is planned for quality, value, and compliance—ideal for established residential streets and new developments alike.
Our Value-First Method
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Budget clarity – Fixed-price contracts and clearly itemised inclusions to protect against hidden extras
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Specification smarts – Recommendations balancing aesthetics, performance, and life-cycle 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 quick fixes
How Your Custom House Extension Comes Together
Consultation & Free Design Offer
We start with a home or video visit to understand goals, budget, and timeline. Choose KT5 as your builder and we’ll include free architectural/structural design to get your scheme moving from day one.
Permissions & Compliance, Handled
We take care of permitted development checks, planning applications, 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 groundwork and structure to electrics, plumbing, and finishes—so your extension is delivered safely, neatly, and 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 Custom House Homeowners Choose KT5 Construction
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Local experience across Custom House and wider East London
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No-surprise pricing with clear, staged payments
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Rated for punctuality, service, and attention to detail
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Smart, long-term solutions that add real value
House Extension in Custom House—Built Right
Ready to plan a House Extension in Custom House that’s on time and on budget? KT5 Construction is here to help. Book your free consultation to discover how we can save you time, money, and stress—while building the home you’ve always wanted. Start with KT5 Construction or read more about typical routes on House Extension in Custom House.
Frequently Asked Questions
How much does a Custom House house extension cost?
Costs vary by size, design, 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 for an extension in Custom House?
Many rear and side extensions fall under Permitted Development if they meet size and design limits. Projects outside these limits, flats/maisonettes, or works in sensitive areas may require full planning consent. We’ll confirm the best route and handle all submissions.
How long does an extension take?
Typical on-site durations (after design and approvals):
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Single-storey: ~8–12 weeks
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Double-storey: ~12–20 weeks
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Loft conversion: ~6–10 weeks
Timeline depends on size, structure, and specification.
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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