Premium SIP panels in stock — UK delivery in 5-10 working days.
UltraSIPs
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UK SIP Panel Specialists

UK SIP panels for faster, warmer builds.

Structural insulated panels with Celotex (Sopratherm) or IKO Enertherm cores and Sterling OSB3 for airtight, energy-efficient spaces—from garden rooms to extensions and full self-builds.

Configure Your KitGet a Quote

Made in the UK

Sterling OSB3 + Celotex/IKO

5–10 day delivery

UK mainland dispatch

U-values to 0.144

Meets Part L targets

Full kits & support

Design → Manufacture → Delivery

Products at a glance

SIP Panels (Celotex)

Celotex/Sopratherm core + Sterling OSB3.

SIP Panels (IKO)

IKO Enertherm core + Sterling OSB3.

Splines & Components

PIR splines, fixings, and details to maintain U-values.

Timber & OSB

C16/C24 timber stock for frames, lintels, and structural use.

Kits

Choose your kit type and footprint for fast, labeled installs.

Garden Rooms

Kit options for fast, airtight builds with a clean finish.

Typical delivery

5–10 working days

Delivery details

Made in the UK

Sterling OSB3 + Celotex/IKO

5–10 day delivery

UK mainland dispatch

U-values to 0.144

Meets Part L targets

Full kits & support

Design → Manufacture → Delivery

How we work

Design → Manufacture → Delivery

We pair engineered SIP panels with clear drawings, predictable lead times, and full support through installation.

1

Share your drawings

Upload rough sketches or CAD files for a same-day review.

2

We cost + design

Transparent pricing with engineered drawings ready to build.

3

Manufacture in the UK

Precision-cut SIP panels with labeled components.

4

Deliver & support

We ship nationwide and stay close through installation.

Talk to engineeringDelivery details

U-values down to

0.144 W/m²K

142–172mm panels

Faster builds

Up to 50% quicker

Versus traditional timber frames

Engineered drawings

We supply labeled panels, splines, and connection details so on-site crews can assemble without guesswork.

Bring your vision to life

From first sketch to finished build

We partner with designers, builders, and self-builders on every type of SIP project. Share your drawings and we'll engineer, manufacture, and deliver a labeled kit with clear install details.

Self-builds & extensions

Tight U-values, labeled kits, and drawings that keep inspectors happy.

Garden rooms

Standard and bespoke footprints with splines, fixings, and trims ready to install.

Commercial & education

Scaleable SIP solutions for classrooms, pavilions, and modular builds.

Share your projectConfigure a kit

What to expect

  • • Engineered drawings and labeled panels
  • • U-value calcs and Part L compliance support
  • • Delivery dates you can plan around (5-10 working days)
  • • WhatsApp/phone support during install

Need a custom footprint?

Send your sketch or DWG and we'll cost and cut it.

Extension built with UltraSIPs
House with UltraSIPs panels

Performance

Calculate your U-value

Compare OSB thickness and Celotex cores in seconds. Validate compliance before you order.

• BS EN ISO 6946 methodology

• Walls, pitched roofs, and flat roofs

• Shows compliance with Part L 2021

Loading U-value calculator…

Proof

What builders say

"Panels landed on site in 7 days. Airtight, square, and faster to erect than any timber frame we’ve used."

Matt, Surrey

Self-build extension

"Garden room kit was numbered and ready to go. We were weather-tight in two days."

Jo, Bristol

Garden office kit

"Clear drawings, dependable delivery, and zero guesswork on U-values."

Elliot, Manchester

Contractor

Ready to build with UltraSIPs?

Send your drawings or configure a kit to get pricing and timelines.

Configure nowTalk to the team