1. Pick a size
Use the sizes hub or send L × W on WhatsApp.
Project type
SIP shells for garden annexes and guest rooms
An annexe shell is still walls + roof SIP panels. Habitable use needs proper design, services and approvals — we do not invent those for you.
How sipsonline fits
Panels and shell kits — not a turnkey building
Start with 12×12 ft or 16×16 ft, then read planning & regs (general UK guidance).
2. Choose core
Headline SIP122 EPS £103, or PIR / other thicknesses on panels.
3. Add extras
Windows, cladding, EPDM, ground screws — all quote-led.
4. Assemble on site
Openings cut on site. Fitting by you or your builder unless we quote it.
Related: how it works · gallery · FAQ · planning & regs
Photos
Project photos
Real sipsonline photos. Captions stay generic — we do not invent locations or customer names.
