The Complete Guide to SIP Panels UK 2025: Everything You Need to Know
SIP panels are transforming UK construction. This comprehensive guide covers everything you need to know about Structural Insulated Panels—from technical specifications to real-world applications.
What Are SIP Panels?
Structural Insulated Panels (SIPs) are high-performance building panels used in walls, roofs, and floors. They consist of a foam core (typically PIR - polyisocyanurate) sandwiched between two OSB (oriented strand board) facings.
How SIP Panels Work
SIP panels achieve superior performance through three mechanisms:
- Conductive Resistance: The foam core resists heat flow
- Convective Barriers: The sealed structure prevents air movement
- Airtightness: Properly installed panels create an airtight envelope
Types of SIP Panels Available
| Thickness | U-Value | Best For |
|---|---|---|
| 72mm | 0.396 W/m²K | Storage, non-heated spaces |
| 97mm | 0.264 W/m²K | Occasional-use buildings |
| 122mm | 0.209 W/m²K | Garden rooms, offices (most popular) |
| 142mm | 0.179 W/m²K | Extensions, new builds |
| 172mm | 0.144 W/m²K | Premium efficiency projects |
10 Key Benefits of SIP Panels
- Superior thermal performance
- Faster build times (up to 50% quicker)
- Excellent airtightness
- Cost-effective over building lifetime
- Versatile applications
- Reduced labour requirements
- Consistent quality (factory manufactured)
- Lower heating costs
- Environmentally friendly
- Long lifespan (60+ years)
Applications
- Garden rooms and offices
- Home extensions
- New builds and self-builds
- Roof insulation and replacement
- Commercial buildings
- Retrofit projects
Building Regulations
UK Building Regulations Part L require walls to achieve U-values of ≤0.18 W/m²K. Our 142mm and 172mm panels meet or exceed these requirements.
Installation Process
- Prepare level foundation
- Install base plate
- Erect wall panels
- Connect panels with PIR splines
- Install roof panels
- Seal all joints
- Apply finishing materials
Cost Analysis
Material costs range from £88.90-£133.40/m² depending on thickness. Complete project costs including installation typically range from £1,000-1,800/m².
Choosing the Right Panel
Consider your building type, heating requirements, and budget. For most garden rooms and home offices, the 122mm panel offers the best balance of performance and cost.