Designed, Built and Installed in Weeks
Free Site Survey
Free 3D Design
Fully Bespoke Builds
Fast Installation
10-Year Structural Guarantee
5-Star Rated on Google
FULLY INSURED & CERTIFIED
• Free 3D Design
100% BESPOKE TAILORED TO YOU
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Premium Garden Rooms in London, Built Around the Way You Live
A garden room is no longer just a shed at the bottom of the garden. For homeowners across London, it is a fully insulated, year-round living space that adds usable square footage and genuine property value without the cost, disruption or planning headaches of a traditional extension. Garden Room London is the dedicated London arm of Pecasa — a UK garden building specialist with over a decade of experience designing and installing premium garden rooms, offices and annexes. Every Garden Room London project is bespoke. We do not sell off-the-shelf flat-pack kits. We design around your garden, your home and the way you actually intend to use the space — whether that is a quiet home office, a soundproofed music studio, a granny annexe or a stylish entertaining room. Our manufacturing happens in our UK facility, our installers are an in-house team (not subcontractors), and most projects are weather-tight within two weeks of breaking ground.
Why London Homeowners Choose a Garden Room
Year-round comfort
Our Structural Insulated Panel (SIPs) construction outperforms timber-frame builds on thermal efficiency. Warm in January, cool in August, with no condensation issues.
Truly bespoke design
Every plan is drawn from scratch around your garden's dimensions, orientation and access. No templates.
Premium specification as standard
Plastered interiors, EPDM rubber roof, aluminium double-glazed doors, full electrics and quality flooring are all included. No hidden upgrades.
Fast, professional installation
Off-site precision manufacturing means most builds are installed in 1–2 weeks, with minimal disruption to your home and garden.
Our Garden Building Solutions
We design and install four core types of garden building across London. Each is fully bespoke and engineered to the same premium standard.
Garden Rooms
Versatile, fully insulated outdoor living spaces. Use them as a home office, hobby room, entertaining space or guest room. The most popular choice for London homeowners adding flexible space without extending the main house.
Garden Offices
Purpose-built for working from home. Acoustic insulation for video calls, integrated lighting and power, ergonomic layouts. A dedicated workspace that separates your work life from your home life — without commuting.
Garden Annexes
Self-contained living accommodation. Suitable for elderly parents (granny annexes), adult children, guests or short-term rental income. Built with kitchenettes, bathrooms and bedrooms where required.
Garden Gyms & Studios
Dedicated wellness and creative spaces. Reinforced flooring for gym equipment, soundproofing for music or yoga studios, generous glazing for natural light. Built around your specific activity.
The Build Standard
Built Better. Built to Last.
Structural Insulated Panels
engineered for thermal efficiency far beyond traditional timber-frame construction.
Ground Screw Foundations
Cleaner, stronger and more sustainable than concrete; no curing time, no excavation mess.
EPDM Rubber Roofing
50-year life expectancy, fully weatherproof, low maintenance.
High-Performance Insulation
Excellent thermal efficiency for year-round comfort & lower bills.
Aluminium Double-Glazed Doors & Windows
slim sightlines, excellent thermal performance, contemporary aesthetic.
Certified Electrics & Lighting
fully Part P compliant, with plenty of sockets, LED lighting and smart-home options.
Our 4-Step Process
1. Free Consultation & Site Survey
We visit, measure, listen. Understanding your space, your goals and your budget before we draw a single line.
2. Free 3D Design & Quotation
Within 7 days you receive a photo-realistic 3D design and a detailed, transparent quotation. No upsell pressure.
3. Precision Manufacturing
Your build is precision-manufactured in our UK facility while groundworks happen on-site in parallel..
4. Installation & Handover
Our in-house team installs in 1–2 weeks. Full clean-up, snagging walkthrough, and you are using your new space the same day.
Beautiful Spaces. Built Bespoke.
WHAT OUR CUSTOMERS SAY
Trusted By Homeowners
Across The UK
"Patrick, Shab, and the entire Pecasa team provided an absolutely seamless experience from start to finish. Our new bespoke garden studio was completely installed in just under two weeks."
Homeowner in London
"The premium insulation keeps it perfectly comfortable for year-round use. The team was courteous, professional, clean, and answered every single question we had during the build process."
Alex M.
"From the initial bespoke design consultation to the final swift handover, the execution was flawless. A highly stress-free process that completely transformed our outdoor space."
Sarah T.
"Exceptional build quality and outstanding customer care. The installation window was shockingly fast, and the finished garden room completely outshines our original design expectations."
James L.
READY TO CREATE YOUR PERFECT SPACE
Let;s bring your vision to life. Free site survey. expert advice, and no obligation
Free Site Survey
Free 3D Design
No Obligation
Expert Advice
Common Questions About Garden Rooms in London
A premium fully insulated bespoke garden room in London typically ranges from £25,000 to £55,000+ depending on size, specification and complexity. The average 4x3m garden room with full insulation, electrics, plastered finish and quality flooring sits around £32,000–£38,000. We provide detailed itemised quotations so you know exactly what is included.
Most garden rooms are weather-tight within 5–7 working days, with full completion (including interior finishing and electrics) inside 2 weeks. Larger annexes may take 3–4 weeks.
Yes. Our SIPs construction, high-performance insulation and double glazing mean Garden Room London builds are comfortable in all four seasons. Heating and cooling options are available.
A well-built garden room typically adds 5–15% to property value, depending on size, quality and how the space is used. More importantly, it adds usable square footage at roughly half the cost-per-sqm of a traditional extension.
We cover all of London (every postcode within the M25) and surrounding areas including Hertfordshire, Watford, St Albans and Radlett. Our Watford manufacturing facility means North London suburbs are particularly well-served.
BOOK YOUR FREE SURVEY
Ready to transform your garden? Book your free site survey and 3D design today. No obligation, no pressure — just expert advice and a clear, honest quotation.
