Are you planning to build a garden office, home gym, studio or additional space in your garden? One of the first questions you will probably ask is: How much does a SIP garden room shell kit cost?
The price depends on the size of the building, the SIP panel thickness and whether you need additional services such as delivery, installation, foundations or roof waterproofing.
At IRSIP Construction Ltd, we manufacture made-to-measure SIP garden room shell kits in our Leicester factory and supply customers across the UK.
Our standard garden room shell kits currently start from £1,459 + VAT, with a range of 13 models and bespoke dimensions available.
Let’s look at what affects the price and what you receive for your money.
1. SIP Garden Room Shell Kit Prices in the UK
At IRSIP Construction, we offer a range of SIP garden room shell kits suitable for different garden sizes and purposes.
Here are some examples from our current range:
| Garden room size | Shell kit price (excl. VAT) |
|---|---|
| 2.44m × 2.44m | £1,459 |
| 2.70m × 2.44m | £1,614 |
| 3.66m × 2.63m | £2,359 |
| 3.66m × 3.30m | £2,956 |
| 4.50m × 3.05m | £3,363 |
| 4.88m × 3.05m | £3,646 |
| 4.88m × 3.85m | £4,603 |
All prices are excluding VAT and cover the SIP structural shell kit only.
These are examples from our standard range. We can also manufacture SIP shell kits to bespoke dimensions to suit your available space.
Explore our full range of SIP garden room kits
2. What Is Included in the SIP Shell Kit Price?
When comparing garden room prices, it is important to understand exactly what is included.
At IRSIP Construction, our standard shell kits contain the main structural components required to assemble your garden room shell.
Our standard SIP shell kit includes:
- 97mm SIP panels for walls, floor and roof.
- 11mm OSB3 + 75mm EPS insulation + 11mm OSB3.
- C24 structural timber.
- OSB connection splines.
- Expanding foam.
- Structural screws and required fixings.
- Assembly instructions.
The SIP panels are manufactured and prepared according to the agreed garden room design.
Our shell kits are suitable for customers who want to assemble the structure themselves or use their own building contractor.
Important: The shell kit is the structural starting point of your garden room, not a fully finished building.
3. What Is Not Included in the Standard Price?
Our website prices are for the SIP shell kit only.
The following items and services are not included in the advertised shell kit price:
- Delivery.
- Installation.
- Ground screw foundations.
- EPDM roof waterproofing.
- Breather membrane.
- Windows and doors.
- External cladding.
- Electrical and plumbing work.
- Internal wall, ceiling and floor finishes.
Some of these services are available directly from IRSIP Construction at additional cost.
This allows customers to choose the services they need rather than paying for a complete package they may not require.
4. Optional Extras and Additional Costs
We understand that every garden room project is different. Some customers prefer to build the shell themselves, while others want professional installation.
IRSIP Construction offers several optional services.
SIP Shell Kit Installation
If you prefer not to assemble the structure yourself, our team can provide professional SIP shell kit installation.
Installation is quoted separately based on the project size, location and site requirements.
Ground Screw Foundations
Ground screws can provide a practical foundation solution for suitable garden room projects.
We offer ground screw foundation supply and installation at additional cost, subject to ground conditions and project requirements.
EPDM Roof Waterproofing
Protecting the SIP roof from water is an important part of the construction process.
We offer EPDM roof waterproofing supply and installation as an optional service.
Breather Membrane
We can also supply and install a suitable breather membrane to help protect the SIP wall structure before external cladding is installed.
Thicker SIP Panels
Our standard garden room shell kits use 97mm SIP panels for walls, floors and roofs.
Customers can request thicker SIP panels where required. Prices for panel thickness upgrades are provided separately.
Nationwide Delivery
We manufacture our SIP panels and shell kits in Leicester and can arrange delivery throughout the UK.
Delivery costs depend on the location, distance and site access.
5. Can I Order a Bespoke SIP Garden Room Size?
Yes. You are not limited to our 13 standard garden room models.
At IRSIP Construction, we manufacture SIP shell kits to suit your required dimensions.
Whether you need a compact garden office, a larger home gym or a combination of different spaces, we can discuss your requirements and provide a tailored quotation.
We can also accommodate different door and window opening positions within the agreed design.
This gives customers greater flexibility when planning their garden room.
6. Is a SIP Shell Kit Cheaper Than a Fully Finished Garden Room?
A SIP shell kit generally has a lower initial purchase price than a complete, professionally finished garden room because it contains the structural components rather than the entire finished building.
With a shell kit, you can choose how to complete the project.
For example, you may decide to:
- Assemble the SIP structure yourself.
- Hire a local contractor.
- Arrange your own windows and doors.
- Choose your preferred external cladding.
- Complete internal finishes gradually.
This flexibility can help you manage your budget and choose materials according to your preferences.
However, remember to include the cost of foundations, waterproofing, glazing, cladding, installation and internal finishing when calculating the total project budget.
The final cost of a completed garden room will depend on the choices you make.
7. Why Buy a SIP Shell Kit Directly From a Manufacturer?
Buying directly from a SIP manufacturer can offer several advantages.
At IRSIP Construction, we manufacture our SIP panels and garden room shell kits in our own Leicester facility.
Our customers benefit from:
- Direct communication with the manufacturer.
- Made-to-measure SIP shell kits.
- A choice of standard models or bespoke dimensions.
- Factory-prepared structural components.
- Clear shell kit pricing.
- Optional installation and waterproofing services.
- Nationwide delivery.
Our focus is on supplying the structural shell so customers and contractors can complete the remaining work according to their project requirements.
8. How Do I Get an Accurate SIP Garden Room Quote?
To provide an accurate quotation, we normally need a few details about your project:
- Required garden room length and width.
- Preferred SIP panel thickness.
- Delivery postcode.
- Approximate door and window opening sizes.
- Whether you require supply only or supply and installation.
- Any optional services such as foundations or waterproofing.
If you are unsure about the dimensions, you can browse our standard garden room models for ideas.
Our team will be happy to discuss your requirements and prepare a quotation.
Conclusion: How Much Should You Budget for a SIP Garden Room Shell Kit?
At IRSIP Construction, our standard SIP garden room shell kits currently start from £1,459 + VAT, with larger models and bespoke sizes priced according to their specifications.
The advertised shell kit price covers the structural components, while delivery, installation, foundations, waterproofing and other services are calculated separately.
Whether you are planning a garden office, home gym, studio or multipurpose garden room, a SIP shell kit gives you the flexibility to create a space that suits your needs and budget.