The Elephant in the Room
"It's expensive, isn't it?"
We hear this every day. And the answer is: It depends on how you measure it.
If you only look at the cost of materials (bricks vs panels), SIPs look 10-15% pricier. But if you look at the finished cost—including labour, waste, and time-on-site—the story changes dramatically.
Material Cost
SIPs: Higher (~£60-£90/m²). Includes structure + insulation.
Traditional: Lower blocks. Insulation bought separately.
Labour Cost
SIPs: Drastically Lower. Shell up in days, not weeks.
Traditional: High. Bricklayers are £250+/day for weeks.
2025 Price Guide (Estimated)
Based on a standard single-storey garden room extension.
150mm SIP Panels
The gold standard for residential extensions. Ultra-efficient 0.18 U-Value.
100mm Panels
Perfect for garden rooms and internal walls.
Splines & Timber
Connecting timbers often missed in quotes.
Delivery (Hi-ab)
Site access dependent. Includes offloading.
Hidden Savings
1. No Skip Hire (Almost)
There is virtually zero waste with a SIPs kit. It's pre-cut. With brick and block, you're paying for 10% wastage and then paying again to hire a skip to take it away.
2. Shallow Foundations
Because SIPs are ~60% lighter than masonry, you can often use screw piles or ground screws instead of deep concrete trenches. This alone can save £2,000+.
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