SIP Panels UK | UltraSIPs
UltraSIPs LTD: Premium Structural Insulated Panels
UK based manufacturer of high-performance SIP panels with Celotex insulation and Sterling OSB. Custom-designed to your drawings with full technical support.
How to Order Your Custom SIP Panel Kit
We work from YOUR drawings to create a bespoke SIP panel kit. Here's our simple 5-step process:
Send Us Your Drawings
Send us your plans - can be a rough hand sketch or professional architect drawings. We just need dimensions and basic layout.
Receive Estimated Quote
Within 1-2 business days, we'll review your drawings and send back an estimated quotation for your complete SIP panel kit, including panels, splines, fixings, and delivery.
Pay Drawing Fee (100% Refundable)
If you're happy with the estimated price, pay a drawing fee (typically £300-600 depending on project size). This fee is 100% refundable against your kit purchase if you buy from us. If not, you keep the professional drawings.
We Create 3D CAD Drawings
Our technical team creates detailed 3D CAD drawings showing every panel, cut-out, and component. You'll receive professional drawings that can be used for Building Regulations approval.
Finalize & Manufacture
Once you approve the drawings, we provide a final quotation. Upon order confirmation and deposit, we begin manufacturing your custom SIP panels.
Ready to Get Started? Send Your Drawings Today!
Call us or email your drawings for a free estimated quotation within 1-2 business days
What Are SIP Panels?
SIP panels (Structural Insulated Panels) are high-performance building panels used in residential and commercial construction throughout the UK. Each panel consists of an insulating foam core—typically Celotex PIR (Polyisocyanurate)—sandwiched between two structural facings of Sterling OSB (Oriented Strand Board).
This sandwich construction creates an incredibly strong, thermally efficient building component that outperforms traditional construction methods in terms of insulation, airtightness, and build speed. UltraSIPs manufactures premium SIP panels that meet and exceed UK Building Regulations Part L 2021, with U-values ranging from 0.144 to 0.396 W/m²K depending on panel thickness.
Every project is unique, which is why we manufacture custom SIP panel kits designed specifically to your drawings. Whether you provide a hand sketch or professional architectural plans, we'll create a bespoke kit that fits your exact specifications.
Our SIP panels are perfect for garden rooms, house extensions, new builds, commercial projects, and renovation works across the UK.
Why Choose UltraSIPs SIP Panels?
✅ Custom-Made to Your Drawings
We don't do off-the-shelf. Every SIP kit is manufactured specifically to YOUR project. Send us sketches or professional drawings - we'll create detailed 3D CAD drawings and cut every panel to exact specifications.
✅ Professional 3D CAD Drawings
Our technical team creates detailed 3D models showing panel layout, dimensions, openings, and assembly instructions. These drawings can be submitted for Building Regulations approval.
✅ Premium Celotex Insulation
We use Celotex GA4000 and XR4000 PIR insulation with industry-leading thermal conductivity (λ = 0.022 W/mK). This means superior insulation performance in thinner panels compared to alternatives.
✅ Sterling OSB Construction
11mm or 18mm Sterling OSB3 boards provide proven structural performance and enhanced moisture resistance. Stronger and more reliable than standard OSB.
✅ Building Regulations Compliant
All our SIP panels meet or exceed UK Building Regulations Part L 2021. Our 142mm panels achieve U-value 0.179 W/m²K, easily meeting the 0.18 W/m²K requirement for walls.
✅ Fast UK Manufacturing & Delivery
1 week+ delivery to anywhere in the UK. We manufacture in-house in our UK factory, so we control quality and lead times. Depending on your order size, we could have your order dispatched within 3 days.
💡 Understanding Our Drawing Fee
Creating detailed 3D CAD drawings takes significant time and expertise from our technical team. To ensure we're working with serious buyers, we charge a drawing fee (typically £300-600 depending on project complexity).
✅ If You Buy From Us:
The drawing fee is 100% refundable against your SIP kit purchase price. You pay nothing extra - the fee simply secures your place in our production queue.
📐 If You Don't Buy From Us:
You keep the professional 3D CAD drawings. You're free to use them with another supplier or builder. No hard feelings - the drawings are yours.
Why we do this: Creating technical drawings requires skilled CAD technicians, structural calculations, and quality checks. The drawing fee ensures we can invest this time in projects that are serious about moving forward.
SIP Panel Sizes & Specifications
UltraSIPs manufactures SIP panels in five standard thicknesses, each designed for specific applications. Standard sheet size is 1220mm x 2440mm (4ft x 8ft), but we cut every panel to your exact project requirements.
| Panel Thickness | Insulation Core | U-Value (W/m²K) | Typical Application | Price From |
|---|---|---|---|---|
| 72mm | 50mm Celotex GA4000 | 0.396 | Sheds, stores, light buildings | £88.90 |
| 97mm | 75mm Celotex GA4000 | 0.264 | Garden rooms, studios, small outbuildings | £88.90 |
| 122mm ⭐ | 100mm Celotex GA4000 | 0.209 | Most Popular: Extensions, new builds, garden rooms | £98.70 |
| 142mm | 120mm Celotex XR4000 | 0.179 | High-performance residential & commercial | £115.50 |
| 172mm | 150mm Celotex XR4000 | 0.144 | Ultra-low energy, passive house standard | £133.40 |
💡 Need help choosing? Use our free U-Value Calculator to determine which panel thickness meets your Building Regulations requirements, or call us on 0800 033 7330 for expert advice.
Benefits of SIP Panels vs Traditional Construction
50% Faster Build Time
SIP panels are manufactured off-site to exact specifications, dramatically reducing on-site construction time. What takes weeks with traditional methods takes days with SIPs.
Superior Thermal Performance
Celotex PIR insulation (λ = 0.022 W/mK) provides exceptional thermal efficiency. A 122mm SIP panel outperforms a 300mm+ traditional cavity wall for U-value.
Exceptional Airtightness
Continuous insulation with minimal joints eliminates thermal bridging. SIP buildings achieve airtightness levels of 1-3 ACH @ 50Pa vs 5-10 ACH for traditional builds.
Lower Heating Bills
Superior insulation and airtightness reduce heating costs by 40-60% compared to standard construction. Savings pay back the panel cost within 3-5 years.
Structural Strength
Sterling OSB facings bonded to rigid PIR core create incredible structural integrity. SIP panels can span further than traditional stud walls with less material.
Sustainable Building
Less waste, fewer deliveries, reduced energy consumption. SIP construction generates 50% less construction waste than traditional methods. Lower carbon footprint.
What Can You Build with SIP Panels?
Garden Rooms
Year-round insulated garden offices, studios, gyms, and entertainment spaces. Our most popular application.
House Extensions
Fast, thermally efficient extensions. Add extra rooms without the disruption of traditional building methods.
New Build Homes
Self-build and commercial residential projects. Weather-tight shell erected in days, not weeks.
Commercial Buildings
Offices, retail units, light industrial. Fast construction with excellent thermal performance.
Holiday Lodges
Glamping pods, holiday lets, and seasonal accommodation with superior insulation for year-round use.
Outbuildings
Garages, workshops, storage buildings. Keep contents protected from temperature extremes.
Calculate Your SIP Panel U-Value
Use our free online calculator to determine which panel thickness meets UK Building Regulations for your project. Instant results based on official Celotex thermal data.
Launch U-Value Calculator →UK Building Regulations & SIP Panels
All UltraSIPs panels are designed to meet or exceed UK Building Regulations Part L 2021 thermal performance standards. Here's what you need to know:
Required U-Values (Maximum Allowed):
✅ UltraSIPs Panels That Meet Building Regulations:
- 122mm panels (U-value 0.209) - Slightly over for walls, perfect for garden rooms (no Building Regs)
- 142mm panels (U-value 0.179) - Meets all requirements
- 172mm panels (U-value 0.144) - Exceeds all requirements, passive house standard
Note: Garden rooms under 30m² typically don't require Building Regulations approval, making our popular 97mm and 122mm panels perfect for these applications.
Frequently Asked Questions
Do I need professional drawings or can I send a hand sketch?
Either works! You can send us a simple hand-drawn sketch with dimensions, or full architect drawings if you have them. We just need basic dimensions (length, width, height), door/window positions, and any specific requirements. Email to enquiries@ultrasips.com or call 0800 033 7330 to discuss.
How much is the drawing fee and is it really refundable?
The drawing fee is typically £300-600 depending on project complexity (larger buildings require more detailed drawings). Yes, it's 100% refundable against your kit purchase price if you order from us. If you decide not to proceed, you keep the professional 3D CAD drawings to use with another supplier. No hidden fees, no tricks.
How long does it take to get my drawings and quotation?
Initial estimated quotation: 1-2 business days after you send us your drawings. Final 3D CAD drawings: 1-2 weeks after you pay the drawing fee. Once drawings are approved, we provide a final quotation and can begin manufacturing immediately upon order confirmation.
How much do SIP panels cost in the UK?
Individual panel prices start from £88.90 per panel for our 72mm and 97mm options. However, every project is unique - your final cost depends on building size, panel thickness, number of openings (windows/doors), and complexity. Contact us with your drawings for an accurate quotation based on your specific project.
What U-value do I need for Building Regulations?
UK Building Regulations Part L 2021 requires maximum U-values of 0.18 W/m²K for walls, 0.16 W/m²K for pitched roofs, and 0.18 W/m²K for flat roofs. Our 142mm panels (U-value 0.179) and 172mm panels (U-value 0.144) meet all these requirements. For garden rooms under 30m², Building Regulations typically don't apply, so our 97mm or 122mm panels are perfect. Use our free U-Value Calculator to check compliance.
How long does delivery take?
Once your order is confirmed and we begin manufacturing, standard delivery is 1 week+ to anywhere in the UK. For urgent projects, we may be able to expedite production - contact us to discuss your timeline. Delivery time varies based on project size and complexity.
Can I install SIP panels myself?
Yes, SIP panels are very popular with self-builders! With basic carpentry skills and the right tools, you can install SIP panels yourself. Our 3D CAD drawings include assembly instructions. We provide technical support throughout your project. For best results, we recommend having at least two people for panel lifting and positioning. Many customers complete garden rooms in 2-3 weekends.
What information do I need to provide when requesting a quote?
Send us: (1) Dimensions (length, width, height), (2) Door and window sizes and positions, (3) Intended use (garden room, extension, etc.), (4) Any special requirements. A rough sketch or photo is perfect - we'll take care of the rest. Email to enquiries@ultrasips.com or call 0800 033 7330.
Ready to Start Your SIP Panel Project?
Send us your drawings today for a free estimated quotation. Our expert team will guide you through every step from initial sketch to finished SIP kit.
What Happens Next?
✅ Send us your drawings (sketch or professional plans)
✅ Receive estimated quote within 1-2 business days
✅ Pay refundable drawing fee if you want to proceed
✅ We create detailed 3D CAD drawings (1-2 weeks)
✅ Approve drawings, pay deposit, and we start manufacturing!
Questions? Our team is here Monday-Saturday 9am-6pm, Sunday 10am-6pm
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