Looking for more room to grow, live, or entertain? At JP Design Ltd, we specialise in thoughtfully designed house extensions that feel like a natural part of your existing home. Whether you’re adding a kitchen-diner, extra bedrooms, or a home office, we manage every stage—from planning to construction—with care, precision, and a focus on quality.
Single Storey Rear & Side Extensions
A rear or side extension is the perfect way to open up your home, often transforming cramped kitchens or underused garden space into light-filled, practical living areas. Whether you’re after a spacious kitchen-diner, a utility room, or a second lounge, we’ll design and build an extension that suits your lifestyle and enhances everyday living.
Multi-Storey House Extensions
Need more than just ground-floor space? A multi-storey extension gives you added functionality across multiple levels—ideal for growing families or homeowners looking to add bedrooms, bathrooms, or even a home office. We ensure structural integrity, aesthetic continuity, and full compliance with building regulations at every step.
Over-Garage House Extensions
Unlock the potential above your existing garage with a bespoke over-garage extension. It’s an efficient way to add extra rooms without compromising garden space. Whether it’s an additional bedroom, en-suite, or flexible space, we’ll create a design that blends seamlessly with your home’s architecture.
Planning Permissions
Navigating planning permission can be complex—but we’ve got you covered. Our team handles all necessary applications, drawings, and documentation, working with local authorities to secure approvals and keep your project moving forward without delays.
CASE STUDY: Coie Cas
Loft extension and new roof structures
Brief:
Extend the existing loft space, removing the existing roof trusses and installing a tele beam system to support the roof structure and turn the loft space into an extra bedroom and ensuite bathroom. Remove all existing roof tiles and install new, whilst integrating solar panels to both roof pitches. Remove the existing flat roof over the previously extended garage and install a new cut pitched roof for added storage.
What we did:
Remove all existing roof trusses and replaced with a new tele beam system to support the roof structure, removing the necessity for large pieces of steel to support the roof.
Stripped the existing tiles and replaced with new and integrated Solar panels to both pitches of the roof.
Removed the front elevation of tiles and replaced with new to match the new roof tiles and integrated ornate tiles.
Installed a new cut roof over the previously extended garage.
Installed bespoke made pitched windows to both the front and rear elevations with stained glass integrated designed by the client.
The Result
“The craftsmanship and attention to detail throughout our loft conversion were outstanding, beautiful, energy-efficient, and exactly as we envisioned.”
"The craftsmanship and attention to detail throughout our loft conversion were outstanding—beautiful, energy-efficient, and exactly as we envisioned."
Mr & Mrs J, Ascot
"The craftsmanship and attention to detail throughout our loft conversion were outstanding—beautiful, energy-efficient, and exactly as we envisioned."
Mr & Mrs J, Ascot
Have a consultation with us
We’d love to hear about your project. Whether you have detailed plans or just an idea, we’ll help bring it to life — with no pressure, no obligation, and no hard sell.
MEET OUR TEAM
A Family Business,
Built on Craftsmanship
We’re a third-generation construction company offering skilled, friendly service across all trades — from structure to solar, finishes and more.
Everything’s managed in-house for smooth, surprise-free results.
We’ve worked across Haslemere, Ascot, Sunninghill, Addlestone, Maidenhead and Cobham — and we’d love to help with yours next.