SIP Garden Room Kits UK
High-quality insulated SIP garden room kits designed for fast installation, year-round use and a premium finished result.
Fast, Insulated, DIY-Friendly Garden Room Kits
Sips & Splines supplies structural insulated panel garden room kits that give you a quicker, cleaner and more energy-efficient way to create a garden office, home gym, studio or multi-use outdoor room. Choose from standard sizes or request a custom quote to suit your project.
Popular SIP Garden Room Sizes
2.44m x 2.44m
A compact, practical kit size ideal for a small garden office, hobby room or extra storage space.
View details →3.66m x 2.44m
Our most popular layout for garden offices, gyms and flexible multi-use spaces with a genuine room feel.
View details →4.88m x 2.44m
A larger footprint for customers wanting more usable internal space for work, leisure or entertaining.
View details →Why Choose Sips & Splines
Precision-cut SIP panels help you assemble the shell far quicker than many traditional build methods.
Designed for year-round comfort with strong thermal performance and upgrade options.
A practical system for builders, trades and capable DIY customers looking for faster assembly.
We can supply garden room kits across the UK with clear fixed-price quotations.
What’s Included in the Shell Kit
Included
- Pre-cut SIP wall panels
- Pre-cut SIP roof panels
- Pre-cut SIP floor panels
- Structural splines and timber components
- Fixings pack
- Prepared openings on selected layouts
Optional Extras
- EPDM rubber roof kits
- Sliding patio doors
- External cladding options
- Different insulation specifications
- Custom sizes and layouts
From Kit to Finished Garden Room
Assemble the insulated floor, wall and roof panels to create the structural shell.
Add breather membrane, roof covering and glazing to form a weatherproof structure.
Complete the outside with your preferred cladding and add internal finishes to suit your use.
Frequently Asked Questions
Are your garden room kits supplied fully finished?
No. Our base product is an insulated SIP shell kit. Cladding, roof finishes, glazing and internal lining are added separately unless quoted.
Can I request a custom size?
Yes. We offer standard kit sizes and can also quote for custom layouts and specifications.
Are SIP garden room kits suitable for year-round use?
Yes. SIP construction provides a strong insulated shell that is much better suited to year-round use than many basic garden buildings.
Ready to Start Your Garden Room Project?
Tell us your preferred size, insulation option and any extras you want, and we’ll provide a clear fixed-price quotation.
Get My Fixed Price Quote →