Transform your outdoor space with high-performance, fully insulated garden buildings — expertly designed, locally manufactured, and installed in as little as two weeks.
✔ Free Site Survey
✔ Free 3D Design
✔ Fully Bespoke Builds
✔ Premium Materials as Standard
Bespoke Garden Rooms & Annexes Built for Modern Living
At Pecasa, we design and build premium bespoke garden rooms and garden annexes for homeowners across London and the UK. Our buildings are engineered for year-round comfort using advanced SIPs construction, ground screw foundations, and high-performance insulation.
Whether you need a garden office, guest annexe, home gym, or multi-purpose outdoor living space, Pecasa delivers fully customised solutions — manufactured locally and installed with speed, precision, and minimal disruption.
Bespoke Garden Rooms & Annexes Built for Modern Living
Built for Year-Round Living
Every Pecasa garden room is fully insulated using Structural Insulated Panels (SIPs), helping maintain warmth in winter and comfort in summer — not just a seasonal garden building.
Truly Bespoke Design
No templates. No off-the-shelf boxes. Every garden room and annexe is designed around your space, your lifestyle, and your exact requirements.
Fast, Professional Installation
Our precision manufacturing process allows most garden rooms to be installed in as little as two weeks, with minimal disruption to your home.
Premium Specification as Standard
Unlike many providers, key features such as plastered interiors, flooring, lighting, and climate control options are included as standard — delivering real value and transparency.
Contact us today to book your free consultation.
Pecasa Premium Garden Rooms and Annexes are cost effective, fully insulated practical space solutions to expanding your home, adding a quality environmentally friendly, sustainable and energy efficient space for year round use.
Two Week Installation
Sustainability
High Quality British Manufactured
Fully Customisable
Modern Living Premium Garden Rooms
Pecasa provides top-of-the-line, bespoke garden rooms that allow your living area to extend seamlessly. Our structures, which are custom designed and built, will enhance your lifestyle and your property’s value. We allow you the luxury of creating your own home office, gym, creative studio, or other serene garden modular rooms.
Of all the companies that design and build garden rooms, Pecasa provides the most personalized experience. From the initial concept and design to the manufacture and installation. Our fully bespoke garden rooms are designed to meet your living needs, engineered with the utmost attention to detail, and designed to seamlessly integrate with the garden and the landscaping.
As a turnkey garden room company, we pride ourselves on having no hidden costs. Our garden rooms are engineered, manufactured, and designed to last a lifetime. Our off-site construction incorporates the best premium-grade materials manufactured specifically for the garden room industry in the UK. This means that your modular garden room will exceed your expectations, and the construction will be completed in a timely manner with little disturbance to your garden and landscaping.
For homeowners searching for a garden room near me, Pecasa stands out for our detailed craftsmanship, straightforward pricing, and quality. Every build is executed with a long-term focus so that the build is practical, and well planned, maximizing the use of natural light and energy.
Every Pecasa unit is tailored to your specifications. From garden offices to garden annexes, we prioritize clean lines, intelligent use of space, and high quality, to produce a garden room that is a continuation of your home, rather than an addition.
If your searching garden rooms design near me and want someone to take control of the project from beginning to end, Pecasa is your best choice.
1. Do Pecasa garden rooms require planning permission?
Most of our garden rooms do fall under permitted development so they don’t need planning permission. However there are always a few exceptions that may be dependent on the size and location of the unit. It is best to get clear instruction from our team well before the project begins.
2. How long does it take to install a Pecasa garden room?
Due to the fact that the majority of our products are designed and manufactured before they arrive on site, most of our garden rooms can be installed in as little as a few days, provided that the ground work is ready.
3. Can Pecasa Garden Rooms be used all year round?
Of course. Garden rooms are fully insulated and are built for year round comfort.
4. Can I change the design and layout?
Of course. Each garden room is custom and you can change the size, layout, finishes, and internal elements.