Our SIP Garden Room is a premium, fully insulated garden building that genuinely feels like an extra room at home.
Built with high-performance Structural Insulated Panels (SIPs) in the floor, walls and roof (up to 170mm thick), it offers superb year-round warmth, strength and sound reduction, with low-maintenance cladding, a sleek EPDM flat roof and residential-grade double-glazed windows and doors.
It’s the ideal modern solution for a home office, gym, studio or garden retreat.
Low Maintenance
Simply wash down your cladding when needed.
High Performance
Exceptional insulation in the floor, ceiling and walls.
Max Durability
Engineered to last using Structurally Insulated Panels.
Residential Glazing
uPVC, double-glazed windows and doors as standard.
Patented Wiring System
Your electrician can visit after the build, not during.
Feels Like Home
Quality internal panelling options for a homely finish.
UK Made
Local manufacture with excellent quality control.
10-Year Guarantee
Peace of mind with a comprehensive 10-year guarantee.
About SIP Garden Rooms
Pent-Haus's high-performance Structural Insulated Panels (SIPs) use a modern construction method that offers outstanding insulation, strength, and durability. This means your space stays comfortable year-round, with lower energy costs and minimal maintenance. SIPs also allow for a quicker, cleaner build — so you get lasting quality without the disruption. It’s a smart, future-proof choice that reflects our commitment to efficient, reliable craftsmanship.
Available for bespoke customisation and design to fit most spaces, these garden rooms have become the go-to choice for transforming gardens into modern offices, gyms, hobby rooms and even classrooms.
Bespoke as Standard
Whether you’re creating a home office, gym, studio or chill-out space, our SIP building cabins are designed to feel like a personalised natural extension of your home. With generous ceiling heights, modern finishes and excellent insulation, you get a comfortable, usable room in your garden all year round.
While our demonstration models can be ordered as they are illustrated, we create your building to your specifications so that it's yours — through and through. Here's a list of the standard items that our SIP building cabins come with as a starting point. From there, the options are yours to choose! It’s a flexible, future-ready room that can grow and adapt with your lifestyle.
Standard Features
| Insulation | High-Performance Structural Insulated Panels (SIPs) |
| Cladding | 12mm Tongue and Groove |
| Window Type | Double Glazed |
| Roof | 122mm Pent |
| Floor | 127mm |
| Locking System | Lock & Key |
| Package Dimensions | 3 Oversized Pallets |
Ready to design your SIP Garden Room?
Talk to our team about creating a Pent-Haus SIP cabin that fits your space, your style and your budget. From first ideas to final installation, we’ll guide you through every step.
Enquire about your SIP garden building
Or call 01483 224 186 today
Just to get you started...
Pent-Haus cabins are designed and built to your bespoke needs. But to get a taste of what could be achieved, here are a few examples that may be purchased as illustrated.
Pent-Haus Cabin prices include: hard wearing SIP Panel wall system; EPDM roof covering; Toughtwood Cladding; insulated floor; home delivery and VAT. But does not include installation which can be included when ordering with our team.
