Project Spotlight: A Bespoke 28sqm Multi-Use Garden Room in Twyford, Berkshire (RG10)
A 28sqm bespoke garden room in Twyford, Berkshire (RG10). Explore design, materials, build time, and real project cost for a high-spec garden office.
What does a high-spec, fully bespoke garden room look like in 2026?
We recently completed a 28sqm bespoke garden room in Twyford, Berkshire (RG10), designed to function as a true multi-use space — combining the performance of a modern home extension with the speed and simplicity of a garden room build.
The brief was clear:
Create a large, modern, and thermally efficient space that could be used all year round, without compromise on design or finish.
This bespoke project was fully installed in just 13 working days from start to finish, demonstrating how even larger, high-spec builds can be delivered quickly with the right system and team.
The Specification: A Large-Scale, Bespoke Garden Room
At 4.8m x 6.0m (28sqm), this custom garden room provides a generous internal footprint, suitable for a wide range of uses:
Home office
Studio or creative space
Garden gym
Multi-purpose family room
Larger builds like this require careful planning and precision. For this project, we used SIPs (Structural Insulated Panels) throughout, ensuring both structural integrity and excellent thermal performance.
Who This Garden Room Is Ideal For
A garden room of this size and specification is typically suited to homeowners who need more than just a small office space.
This type of build works particularly well for:
Professionals working from home full-time
Clients needing a dedicated office separate from the house
Multi-use spaces combining work, fitness, and relaxation
Families needing additional flexible living space
Homeowners considering an extension but looking for a faster, simpler alternative
Exterior Design: Clean Lines, Premium Materials
The design focused on a modern, minimalist aesthetic, with a flat roof profile and contrasting materials.
Front Elevation
Premium Millboard Burnt Cedar cladding
Maintenance-free timber effect
Strong architectural presence
Side and Rear Elevations
Black steel sheet cladding
Durable and low maintenance
Clean, contemporary contrast
The result is a garden room that feels like a purpose-built architectural space, not a standard outbuilding.
Glazing & Natural Light: Creating a Bright, Open Space
Natural light was a key part of the design.
We installed:
A large black aluminium sliding door (approx. 2500mm wide)
A fixed front-facing double-glazed window (1700mm x 1200mm)
A bespoke high-level rear window for privacy without losing light
This combination creates a bright, open interior while maintaining privacy — ideal for residential settings like Twyford.
Foundations & Build System: Fast, Clean, and Efficient
For this Berkshire project, we used our ground screw foundation system instead of traditional concrete.
Why ground screws?
No excavation or heavy groundwork
Minimal disruption to the garden
Faster installation
Adaptable to different site conditions
Combined with SIPs construction, this allows for a high-performance build delivered in a fraction of the time of a traditional extension.
Interior Finish: A Fully Turnkey Space
This garden room was completed to a ready-to-use standard, with no further work required.
Interior Specification
Walls: Fully plastered and painted white
Flooring: Karndean LVT flooring
Electrics: Integrated sockets, lighting, and consumer unit
Heating: Smart wall-mounted heater with app control
The result is a space that feels like a natural extension of the home, suitable for daily use all year round.
Why This Garden Room Works So Well
This project highlights what makes a garden room truly successful.
Key factors included:
Size: Large enough to be genuinely multi-functional
Layout: Balanced use of glazing and privacy
Materials: Durable, low-maintenance finishes
Build System: SIPs construction for year-round comfort
Installation: Completed in just 13 working days
Cost & Value: What Did This Project Cost?
For this specific 28sqm bespoke garden room in Twyford, the total build cost was:
£29,000 + VAT
This reflects the size, materials, and high-spec internal finish, including:
SIPs construction for full insulation
Premium external cladding
Aluminium sliding doors and glazing
Fully plastered interior
Karndean LVT flooring
Integrated electrics and heating
For many homeowners, projects like this offer a practical alternative to extensions or loft conversions — delivering a large, usable space with significantly less disruption and a much faster installation time.
Every project we complete is tailored to the client, so costs will vary depending on design, layout, and specification. However, this example gives a clear indication of what a high-quality, fully bespoke garden room of this scale looks like in real terms.
Why Berkshire Homeowners Are Choosing Garden Rooms
In areas like Twyford, Berkshire, garden rooms have become a popular way to create additional space without major building work.
Common reasons include:
Faster installation compared to extensions
Less disruption to the home
Flexible, multi-use space
High-quality finishes suitable for daily use
A Structured, Professional Build Process
Every Backyard Cabins project follows a clear and transparent process:
Initial design and quotation
Technical drawings and planning
Deposit to secure the build slot
Professional installation on-site
Final handover upon completion
Our goal is to deliver a high-spec garden room with a predictable timeline and minimal disruption.
Frequently Asked Questions
How long does it take to build a bespoke garden room?
This project was completed in 13 working days, although timelines vary depending on size and complexity. Most garden rooms are installed within 2–3 weeks.
How much does a garden room like this cost?
A bespoke garden room of this size and specification typically starts from around £29,000 + VAT, depending on design and materials.
Can a garden room be used all year round?
Yes — when built with proper insulation and glazing, a garden room can be used comfortably throughout the year.
Thinking About Your Own Garden Room Project?
If you’re considering a garden room in Berkshire or the surrounding areas, the best place to start is by exploring what’s possible in terms of size, layout, and pricing.
View Garden Room Models & Prices
Explore Our Cabin Range
Request a Personalised Quote