Higher-value living space
Annexe SIP Shell Packages
A budget-first route for granny annexes and longer-term living space where drawings, Building Control and engineering are likely to matter.
Likely starting point
172mm is the normal starting point for habitable/living-space discussions; 222mm may be relevant for stronger thermal targets.
Annexes are valuable projects, but customers need a clear distinction between a SIP shell, planning, Building Control, services and final finishes.
Next best step
Not sure whether to configure, send drawings, or check planning?
For annexe shell projects, the right route depends on how much detail you already have. Choose the closest option and we will keep the next step clear.
Build it online
Use the configurator when you know the footprint, roof style and rough opening positions.
Send it to us
Upload plans, sketches, window sizes or an old quote and we will price the SIP shell with clear assumptions.
Check the route first
Answer a few practical questions about use, height, boundary distance and location before ordering.
What can be included
Why SIP for this project
Why this route works as a SIP build
A SIP shell gives a strong thermal starting point for accommodation-style projects, especially where 172mm or 222mm panels are being considered.
Panel schedules and model checks help separate the manufactured shell from planning, Building Control, services and internal fit-out costs.
The faster shell route can reduce exposed-site time while still allowing engineers and designers to confirm the details before production.
Useful upgrades
- Technical drawing package
- Engineer coordination
- Higher-performance 222mm roof option
- Installation partner quote
Checks before ordering
- Sleeping accommodation and self-contained living use should be treated as Building Control/planning-sensitive.
- Do not rely on garden room permitted-development assumptions for annexes.
- Structural calculations and approvals should be confirmed by the relevant professionals.
Next step
Want us to check your version?
Send drawings, a sketch, a slab size or a configurator link. We can separate the SIP shell, delivery, installation, roof covering and exclusions clearly.