How Much Do SIP Panels Cost? Complete UK Price Guide 2025
How Much Do SIP Panels Cost? Complete UK Price Guide 2025
Transparent pricing, real-world project costs, and honest comparisons. Everything you need to budget your SIP panel project accurately.
"How much do SIP panels actually cost?" It's the first question everyone asks—and for good reason. SIP panels represent a significant investment, and you need accurate numbers to budget your project.
This guide provides transparent, up-to-date pricing for SIP panels in the UK, including real-world project costs, hidden expenses to watch for, and honest cost comparisons with traditional construction.
By the end, you'll know exactly what to budget—no surprises, no hidden costs, just straightforward pricing information.
SIP Panel Prices 2025: Quick Overview
| Panel Type | Price per m² (from) | Typical Use |
|---|---|---|
| 72mm SIP Panel (50mm Celotex) | £88.90 | Sheds, stores, workshops |
| 97mm SIP Panel (75mm Celotex) | £88.90 | Garden rooms, studios |
| 122mm SIP Panel (100mm Celotex) ⭐ | £98.70 | Most popular - Extensions, offices |
| 142mm SIP Panel (120mm Celotex XR4000) | £115.50 | High-performance builds |
| 172mm SIP Panel (150mm Celotex XR4000) | £133.40 | Passive house, ultra-low energy |
Prices exclude VAT. Bulk discounts available. Delivery & PIR splines charged separately.
SIP Panel Material Costs: Complete Breakdown
SIP panel costs aren't just the panels themselves. Here's everything you'll need:
1. The SIP Panels
Base cost is per square meter of panel area. For example, a 4m × 3m garden room:
Example calculation (122mm panels):
- Wall area: ~30m² (4 walls @ 2.4m height)
- Roof area: ~14m² (flat roof or shallow pitch)
- Total panel area: 44m²
- 122mm panels @ £98.70/m² = £4,343
2. PIR Splines
PIR splines connect panels together while maintaining thermal continuity. Essential—never skip these!
| Spline Size | Price per Meter (from) | Used With |
|---|---|---|
| 47mm PIR Spline | £6.90 | 72mm panels |
| 72mm PIR Spline | £8.32 | 97mm panels |
| 96mm PIR Spline | £10.15 | 122mm panels |
| 122mm PIR Spline | £11.28 | 142mm panels |
| 142mm PIR Spline | £13.20 | 172mm panels |
Typical spline cost: Budget ~£10-15/linear meter of panel joint. For 4m × 3m garden room: ~£350-450 total.
3. Fixings & Screws
SIP panels require specialist screws for securing to timber frames and connecting panels:
- SIP panel screws: £50-100 per pack (typically 200-500 screws)
- Typical project usage: 1-3 packs for garden room, 5-10 packs for house
- Budget: £100-300 for most projects
4. Delivery
SIP panels are bulky. Delivery costs vary by location and order size:
- Small orders (garden room): £150-350
- Large orders (house): £400-800
- Crane/forklift offload: £200-400 if site access difficult
Tip: Order all materials together to minimize delivery charges.
Real-World Project Costs: Worked Examples
Let's break down total costs for typical projects:
Project 1: Small Garden Room (3m × 3m)
Specification: 97mm SIP panels, flat EPDM roof, timber cladding, DIY build
| MATERIALS: | |
| 97mm SIP panels (wall: 24m², roof: 10m²) | £3,023 |
| PIR splines (72mm, ~35 linear meters) | £291 |
| Screws & fixings | £120 |
| Delivery | £200 |
| SIP Panel Package Total: | £3,634 |
| OTHER MATERIALS: | |
| Base/sole plate (treated timber) | £150 |
| Windows & door (1 door, 2 windows) | £900 |
| EPDM roof membrane & trim | £450 |
| External cladding (timber board) | £1,100 |
| Internal plasterboard & skim | £600 |
| Electrics & basic heating | £1,200 |
| Flooring (laminate) | £300 |
| Concrete base/foundation | £800 |
| TOTAL PROJECT COST (DIY): | £9,134 |
| With professional labour (+£2,000-3,000): | £11,134-12,134 |
Cost per m² (internal floor area): £1,015/m² (DIY) or £1,237-1,348/m² (professional build)
Project 2: Home Office Garden Room (4m × 3m)
Specification: 122mm SIP panels, pitched roof, render finish, professional build
| MATERIALS: | |
| 122mm SIP panels (wall: 30m², roof: 14m²) | £4,343 |
| PIR splines (96mm, ~45 linear meters) | £457 |
| Screws, fixings & sealants | £180 |
| Delivery | £250 |
| SIP Panel Package Total: | £5,230 |
| OTHER MATERIALS: | |
| Foundation & concrete base | £1,200 |
| Windows & bifold doors (high quality) | £2,200 |
| Roof tiles, membrane & timber | £900 |
| External render system | £1,800 |
| Internal plasterboard, skim & paint | £900 |
| Electrics, lighting & heating | £1,800 |
| Flooring (engineered wood) | £500 |
| LABOUR: | |
| Professional installation (2 weeks) | £4,000 |
| TOTAL PROJECT COST: | £18,530 |
Cost per m² (internal floor area): £1,544/m² (professional build with quality finishes)
Project 3: Residential Extension (5m × 4m)
Specification: 142mm SIP panels, pitched roof, brick slip external finish, full Building Regs compliance
| 142mm SIP panels (walls + roof: ~60m²) | £6,930 |
| PIR splines, fixings & materials | £900 |
| Foundation, DPC & groundworks | £3,500 |
| Windows, doors, glazing | £3,000 |
| Roof tiles, guttering & downpipes | £1,500 |
| Brick slip system (external finish) | £4,200 |
| Internal finishes (plasterboard, flooring, etc.) | £2,500 |
| Electrics, heating, plumbing | £3,500 |
| Labour (professional build, 3-4 weeks) | £8,000 |
| Building control fees, structural engineer | £1,500 |
| TOTAL PROJECT COST: | £35,530 |
Cost per m² (internal floor area): £1,777/m² (high-spec extension with brick finish)
SIP Panels vs Alternatives: True Cost Comparison
How do SIP panels compare to other construction methods on total cost?
| Construction Method | Material Cost/m² | Labour Cost/m² | Total Cost/m² |
|---|---|---|---|
| SIP Panels (122mm) | £550-700 | £350-450 | £900-1,150 |
| Timber Frame + PIR | £450-600 | £450-600 | £900-1,200 |
| Timber Frame + Mineral Wool | £350-500 | £450-600 | £800-1,100 |
| Masonry (block & cavity) | £500-700 | £600-800 | £1,100-1,500 |
💡 Total Cost Reality:
SIP panels cost more on materials but save on labour. Total project costs are within 5-10% of timber frame, and often cheaper than masonry. Factor in lower heating bills (30-40% less) and SIPs become cost-effective within 5-7 years.
10 Ways to Reduce SIP Panel Project Costs
1. DIY Installation
Savings: £3,000-8,000
SIP panels are DIY-friendly. If you're reasonably competent, you can install panels yourself with 2-3 helpers. Professional labour typically costs £200-400/day.
2. Bulk Orders
Savings: 5-10%
Order all materials at once. Suppliers often offer bulk discounts on large orders (house builds). Combine delivery with other self-builders in your area.
3. Simple Designs
Savings: £1,000-3,000
Rectangular buildings with standard panel sizes minimize waste and custom cutting. Every non-standard angle adds cost.
4. Standard Window Sizes
Savings: £500-1,500
Use standard window dimensions. Custom openings require panels pre-cut at factory (extra cost) or on-site cutting (tricky with SIPs).
5. Phase Your Project
Savings: Spreads cost
Build weathertight shell first, finish interiors later. This spreads costs over 6-12 months rather than 2-3 months.
6. Reclaimed Materials
Savings: £500-2,000
Use reclaimed windows, doors, or timber cladding. SIP panels need to be new (performance critical), but finishes can be salvaged.
7. Shop Around for Finishes
Savings: £1,000-3,000
Render, cladding, and flooring vary wildly in price. Timber cladding cheaper than render. EPDM roofs cheaper than tiles.
8. Off-Peak Building
Savings: 5-15% on labour
Build in winter (Oct-Feb). Builders are less busy, labour rates lower. SIP panels aren't affected by cold weather like masonry.
9. Minimal Site Prep
Savings: £500-1,500
For garden rooms, use screw pile foundations instead of concrete (faster, cheaper). Ensure good site access for delivery lorries to avoid crane costs.
10. Choose Right Spec First Time
Savings: £10,000s long-term
Don't under-spec panels to save £1,000 now. Upgrading insulation later costs 10x more. Choose 122mm or 142mm panels for long-term value.
Hidden Costs to Watch For
⚠️ Don't Get Caught Out By These:
- Site access issues: Narrow gates or no forklift access = crane hire (£200-400)
- Building control fees: £500-1,500 for extensions/new builds
- Structural engineer: £500-1,500 for calculations (often required for Building Regs)
- Groundworks surprises: Poor ground = deeper foundations (£1,000-3,000 extra)
- Planning fees: £206 for house extensions (if planning needed)
- Services connection: Electric/water/drainage connection fees (£500-2,000)
- Waste disposal: Skip hire £200-400
- Insurance during build: Self-build insurance £500-1,000/year
Ready to Get Accurate Pricing For Your Project?
Contact our team for a detailed quote tailored to your specific requirements. No hidden costs, just transparent pricing.
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