Extensions
House Extensions Built to Fit Your Life—and Your Home
Whether you’re planning a single-storey rear extension or a complete two-storey addition, Ryan & Sons makes extending your home a stress-free and straightforward process. We work closely with architects and homeowners across London to deliver house extensions that add space, style, and value, without the cost of moving house.
From Concept to Completion—How We Build Your House Extension
A successful home extension project needs more than just bricks and mortar—it requires planning, precision, and a builder you can trust. At Ryan & Sons, we handle every stage of your house extension, from architectural design to final sign-off, ensuring a smooth journey and a space you’ll love.
STEP 1
Plan & Design
We begin by understanding your goals—whether it’s a rear extension to expand the kitchen or a two-storey extension to add bedrooms. Working with trusted architects, we develop detailed home extension plans and help you submit your planning application, including all drawings and documents required by your local planning authority.
STEP 2
Permissions & Preparation
Once your plans are approved, we take care of building regulations compliance and coordinate with structural engineers if needed. We’ll finalise the scope, timeline, and extension cost—whether it’s a single storey extension or something more complex. You’ll get a clear breakdown of the work, including floor area, layout, and materials.
STEP 3
Build & Complete
With approvals in place, we begin construction. Our experienced builders manage every aspect of the house extension project—from groundworks and structure to insulation, windows, and finishes. We work efficiently and cleanly to extend your home with minimal disruption and maximum attention to detail.
Why Homeowners Trust Ryan & Sons for House Extensions
From planning permission to plastering, we’re more than just your builder—we’re your extension partner. With years of experience delivering home extensions across London, we understand how to create space that feels like part of the original house, not just an add-on.
Planning and Permissions Made Simple
Navigating planning permission and building regulations can be overwhelming. We handle the paperwork and liaise with your local planning authority to ensure your house extension project starts on solid ground—whether it’s a side extension, rear extension, or full double-storey build.
Fully Managed Extension Projects
Every home extension project we take on is professionally managed from start to finish. We coordinate architects, trades, and timelines to deliver seamless extensions with minimal disruption to your daily life—on time and on budget.
Built to Add Space and Value
We design and build extensions that not only expand your living space but also increase your home’s value. Whether it’s a kitchen extension, garden room, or new storey, we make sure your investment pays off in comfort, style, and resale potential.
Hear From Homeowners Who’ve Extended With Us
“Ryan & Sons built a beautiful single storey rear extension for our semi-detached house in Wimbledon. The team was professional from day one, helping with planning permission and keeping us informed throughout. We now have a bright, open-plan kitchen and dining space we absolutely love.”
Laura M, Wimbledon
“We had a two-storey side extension added to our home in Finchley, and the results were fantastic. Ryan & Sons managed the whole extension project, from working with the architect to completing on time and within budget. The workmanship was top-class and added serious value to our property.”
Daniel K, Finchley
Ready to Build the Space You’ve Been Dreaming Of?
From side extensions to kitchen reworks and full two-storey builds, Ryan & Sons delivers house extensions that feel seamless and add real value. Let’s bring your vision to life—with planning, precision, and trusted craftsmanship from start to finish.
New Build Home FAQs
Still wondering about the cost, planning, timelines, or design options for your house extension project? We’ve got you covered—with clear answers that combine homeowner insight and builder expertise.
How much does a house extension cost?
The cost of a house extension depends on the type, size, design complexity, and location. In London, a single‑storey extension typically costs between £1,800 and £3,500 per m², while two‑storey extensions range between £1,650 and £3,250 per m² A 30 m² kitchen extension could cost between £54,000–£105,000 (excluding VAT). Structural work, party wall agreements, high-end materials, and planning permission fees may push the costs toward the upper end—but your extension will add significant value and extra space.
Do I need planning permission for a house extension?
It depends. Many single‑storey rear or side extensions fall under permitted development and may not need planning permission—though a lawful development certificate is recommended. However, two‑storey extensions, those extending beyond 50% of garden space, or those in conservation areas will likely require full planning permission . We’ll guide you through local authority rules and planning consent, ensuring your extension is compliant and built correctly.
How long does a house extension project take?
Project timelines vary—for a single‑storey project, expect 4–6 months from architectural design through to final sign‑off; a two‑storey or complex build may take 6–12 months, depending on factors like planning delays, building regulations approval, and specialist trades. When permitted development applies, timelines can be shorter—around 3–6 months. We manage every phase, coordinating architects, builders, and inspections to keep your extension on track.
What types of house extensions are available?
There’s a wide range of extension ideas to suit your home and lifestyle—single‑storey rear extensions, side‑return extensions, two‑storey or wraparound extensions, kitchen extensions, and even garden room extensions. The right type for your house—whether it’s a terraced, semi‑detached, or detached property—depends on your space needs, design preferences, and whether you need planning permission
Our team is here to help you design, plan, and deliver the perfect extension for your lifestyle—and your budget.
