House Extension in Guildford
As one of Surrey and London’s trusted extension specialists, KT5 Construction delivers a smarter, cost-effective way to expand your home in Guildford. From first ideas to final handover, we blend thoughtful design, transparent pricing, and practical cost-saving strategies—so you create the space you need without stress or overspending. With KT5 Constructions we keep communication clear and consistent at every stage, so your vision stays on track and on budget.
What We Do
Building Construction
New Builds, Extensions, Conversions, Renovations
General Building
Property Maintenance, Handyman Service, Decorating
Design
Planning, Design, Project Management, Quality Checking
Guildford Extensions, Done Right
Why choose KT5 Constructions for your Guildford project?
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Local insight that fits your street – From Victorian/Edwardian terraces near the town centre to 1930s semis in Merrow and family homes in Burpham and Stoughton, we design to maximise space while respecting neighbourhood character.
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One accountable team – Surveys, design, permissions, build, and finishes handled end-to-end.
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Fixed costs & reliable programme – No surprises: clear scope, agreed timeline, and regular progress updates.
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Value engineering – Smarter specifications and sequencing that stretch your budget without compromising safety, quality, or longevity.
Extensions We Build Across Guildford & Nearby Villages
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Single-storey rear kitchen/dining extensions for open-plan living
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Side-return and wrap-around layouts to unlock awkward footprints
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Double-storey additions for extra bedrooms, bathrooms, and storage
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Loft conversions and dormers to make the most of your roof space
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Garden rooms/orangeries for home offices, studios, or leisure
Every project is carefully planned to deliver quality, value, and compliance in established residential streets and conservation-sensitive areas.
Our Value-First Approach
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Budget clarity – Fixed-price contracts with transparent allowances
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Smart specifications – Options that balance aesthetics, performance, and lifecycle cost
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Proactive communication – Look-ahead programmes, site updates, and clear payment schedules
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Aftercare mindset – We build for long-term performance, not short-term fixes
How Your Extension Comes Together
Discovery Visit & Free Design Offer
We begin with a home or video consultation to understand goals, budget, and timings. Choose KT5 as your builder and we’ll include free architectural/structural design to get your scheme moving from day one.
Planning & Permissions
We manage permitted development checks, planning applications, party wall matters, build-over agreements, and building control approvals—streamlining the paperwork so you don’t have to.
Construction & Project Management
A dedicated site manager coordinates trades, inspections, and quality checks—from groundwork and structure to electrics, plumbing, and finishes—delivering a neat, safe site and a high-standard result.
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 Guildford Homeowners Trust KT5 Construction
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Proven local experience across Guildford and wider Surrey
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Fixed pricing and clear 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
Let’s Build the Space You Deserve
Ready to plan a House Extension in Guildford that’s on time and on budget? KT5 Constructions 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.
Frequently Asked Questions
How much does a Guildford house extension cost?
Costs vary by size, design complexity, 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 Guildford?
Many extensions fall under Permitted Development, but factors like size, height, proximity to boundaries, conservation areas, and previous additions affect eligibility. We complete the checks, prepare drawings, and manage any planning or building control approvals on your behalf.
How long does an extension take?
Typical on-site durations range from 8–12 weeks for single-storey projects and 12–20 weeks for larger or double-storey schemes, depending on scope, access, and specification. Your programme will set out clear milestones before we start.
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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