From drawings to shell price
SIP Extension Shell Packages
A drawing-led SIP shell route for house extensions where U-values, structural openings, roof design and Building Control need to be handled clearly.
Likely starting point
172mm is the usual starting point for habitable extension walls/roofs; 222mm may be used for stronger roof thermal performance.
Extension customers often have drawings but need a practical SIP shell price without confusing it with windows, finishes, foundations or approval fees.
Next best step
Not sure whether to configure, send drawings, or check planning?
For extension 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
SIP panels suit extensions because they create an insulated habitable shell quickly, reducing time before the structure can be made weather-tight.
Pricing from drawings allows openings, roof shape and structural assumptions to be separated from windows, cladding, finishes and services.
A clear SIP package makes it easier for Building Control, engineers and installers to see what is being supplied and what is by others.
Useful upgrades
- Technical drawing package
- Engineer coordination
- Installation partner quote
- Delivery/offloading plan
Checks before ordering
- Extensions normally need Building Control.
- Structural calculations should be confirmed by an engineer.
- Windows, doors, rooflights, cladding and finishes should be quoted separately unless included.
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.