DIY SIP Garden Room Kits — 10% Summer Sale
Save 10% on selected standard SIP garden room shell kits this summer. Each kit includes insulated floor, wall and roof panels, ready to form a strong shell for your garden room project.
10% Summer Sale on Selected SIP Garden Room Kits
For a limited summer period, selected standard SIP garden room shell kits are available with 10% off the shell kit price. The SIP panels create the main floor, wall and roof structure, giving you a strong starting point ready for doors, roof covering, membranes, battens and external cladding.
We currently prioritise delivery across the North West, with wider UK delivery available by quotation depending on kit size and location. Sale prices apply to the standard SIP shell kit price; optional extras are quoted separately.
Popular SIP Garden Room Kit Sizes — Summer Sale Prices
Choose a standard shell kit size and claim 10% off the shell kit price, or request a custom quote if you need a different footprint, opening layout or door arrangement.
2.44m x 2.44m SIP Kit
A compact SIP shell kit ideal for a small office, hobby space, treatment room or garden studio.
3.66m x 2.44m SIP Kit
Our popular garden room shell size, giving extra usable space while keeping the build straightforward.
4.88m x 2.44m SIP Kit
A wider SIP shell kit suited to a larger office, gym space, studio or multi-use garden room.
View All 10% Summer Sale SIP Kit Prices
We supply a wider range of standard SIP shell kit sizes than the three featured above. The prices below show the 10% Summer Sale price for the standard SIP shell kit only. VAT, delivery, doors, cladding, EPDM roof kit, base, electrics and internal finishes are quoted separately.
2.44m x 2.44m
Was £1,995 + VAT Now £1,795.50 + VAT Save £199.50
Compact starter kit for smaller gardens, offices and hobby rooms.
View Sale Price3.05m x 2.44m
Was £2,295 + VAT Now £2,065.50 + VAT Save £229.50
Practical mid-size kit with more usable width.
View Sale Price3.66m x 2.44m
Was £2,495 + VAT Now £2,245.50 + VAT Save £249.50
Popular garden office and studio size.
View Sale Price4.27m x 2.44m
Was £2,695 + VAT Now £2,425.50 + VAT Save £269.50
Wider shell kit while keeping a compact depth.
View Sale Price4.88m x 2.44m
Was £2,995 + VAT Now £2,695.50 + VAT Save £299.50
Larger wide-format kit for offices, gyms and studios.
View Sale Price3.66m x 3.05m
Was £3,295 + VAT Now £2,965.50 + VAT Save £329.50
More depth for a flexible everyday garden room.
View Sale Price4.88m x 3.05m
Was £3,795 + VAT Now £3,415.50 + VAT Save £379.50
Large kit with extra width and depth.
View Sale Price6.10m x 3.05m
Was £4,295 + VAT Now £3,865.50 + VAT Save £429.50
Largest standard shell kit in the current range.
View Sale PriceWhat’s Included in a SIP Shell Kit?
Our shell kits are supplied as the structural SIP package for the garden room, not as a fully finished turnkey building. This keeps the kit flexible and allows you to choose your own doors, cladding and final finish.
Included
- SIP floor panels
- SIP wall panels
- SIP roof panels
- Structural splines
- Timber components
- Fixings pack
- Standard panel layout drawing
Quoted Separately
- Delivery
- Doors and windows
- External cladding
- EPDM roof covering
- Breather membrane and battens
- Custom openings and extra trimming
- Steel support where required for larger openings
Why Choose Sips & Splines?
Built Around SIP Panels
SIP construction gives you a strong, insulated shell with fewer site-built elements compared with a traditional timber frame build.
Made for Fast Installation
The kit is designed to help capable DIY customers and trades build the main shell quickly, with the panels, splines and fixings supplied together.
Clear Sale Pricing
We show the reduced shell kit price separately from doors, cladding, roof covering and delivery so you can see the saving clearly.
Custom Options Available
Need a different size, large bi-fold opening or side door aperture? We can quote for custom requirements before manufacture.
From SIP Shell to Finished Garden Room
The SIP kit gives you the main insulated shell. From there, you can add your chosen doors, roof covering, membrane, battens and external cladding.
Build the SIP Shell
Floor, walls and roof panels are assembled to form the main insulated garden room structure.
Add Roof Covering and Membrane
The shell is made ready for weather protection with roof covering, breather membrane and battens.
Finish with Cladding and Doors
Complete the external finish with your chosen doors, windows, cladding and trims.
Customer Feedback
“The kit arrived well packed and the shell went up quickly. Clear communication throughout and exactly what we needed for the build.”
Daniel, Penketh“Helpful advice before ordering and a clear breakdown of what was included. The kit made the build much more straightforward.”
Paul C, WooltonFrequently Asked Questions
How does the 10% Summer Sale work?
The 10% discount is taken from selected standard SIP shell kit prices. Optional extras such as delivery, EPDM roof covering, cladding, doors, windows, custom openings and steel support are quoted separately.
Is this a fully finished garden room?
No. This is a SIP shell kit. It includes the SIP floor, wall and roof panels, splines, timber components and fixings pack. Doors, cladding, roof covering and delivery are quoted separately unless specifically agreed.
Are doors and windows included?
Doors and windows are not included as standard. You can supply your own, or we can quote separately depending on the size and specification required.
Can you manufacture custom openings?
Yes. We can allow for custom openings such as bi-folds, patio doors or side access doors. Larger openings may require additional trimming, timber and steel support, which can affect the final price.
Can I order a plain cube and cut my own openings?
Yes, a plain SIP cube with no apertures is usually the most cost-effective option. If you cut your own openings on site, you must make sure they are trimmed and supported correctly, especially for larger door openings.
Is delivery included?
Delivery is quoted separately. We currently prioritise North West delivery, with wider UK delivery available by quotation depending on location and kit size.
What base do I need?
You need a flat, level and structurally suitable base before the SIP kit is installed. The base must be ready before delivery and assembly.
Manufactured by Sips & Splines
Sips & Splines is the trading name used by HFI Services Ltd for our SIP garden room kit range. We manufacture insulated SIP shell kits for self-builders and trades, with clear pricing, practical kit layouts and straightforward advice before you order.
Our focus is on supplying strong, insulated shell kits that give you a fast route to a finished garden room, while allowing you to choose your own doors, roof covering and cladding finish.
Claim Your 10% Summer Sale Quote
Send us your rough dimensions and we’ll confirm the closest SIP kit size, the reduced Summer Sale shell kit price, what is included, and whether any custom openings, trimming or steel support need to be allowed for.
Claim My 10% Sale Quote