The cost of a SIP building depends on its size, design, specification and the scope of your package. Panels supplied for your builder to install will have a different price from a package that includes structural design, fabrication and on-site assembly.
The starting point is understanding exactly what you’re buying. Here’s how to compare SIP prices and prepare for a project quotation.
A price for SIP panels alone won’t tell you the cost of a completed home or extension. When comparing quotations, check which of these services and components are included.
Package names vary between suppliers. Ask for an itemised scope so you can compare quotations on the same basis.
At McVeigh Offsite, we can discuss SIP design, structural calculations, panel cutting and fabrication, delivery and installation requirements.
A useful house kit estimate starts with your drawings. Floor area gives an indication of scale, but the shape of the house, roof design, openings and supporting structure also affect the price.
Two homes with the same floor area can require different quantities of panels, engineering work and installation time.
For a meaningful quotation, establish whether the package covers walls and roof, internal structural elements, floors, associated timbers and installation. Foundations, windows, cladding, services and internal finishes should also be accounted for in your overall build budget.
Explore our SIP homes service.
When you see a SIP price per square metre, check what the measurement refers to.
Panel area is the area of SIP material being supplied. Floor area describes the size of the building. These are different measurements and shouldn’t be used interchangeably.
Also check whether the figure covers raw panels, a fabricated kit or an installed structure, and whether VAT and delivery are included. A low headline price may cover only one part of the work.
The amount of wall and roof material affects the price, alongside the work needed to prepare and assemble it. Changes in building shape, roof geometry and layout can add fabrication and installation requirements.
Early design input helps identify these requirements before the plans are finalised.
Panel thickness and the performance required by the building design influence the specification and cost. The right choice depends on the complete building, including its structure, insulation strategy and detailing.
Large windows, wide door openings and open-plan spaces may require additional support. Depending on the design, this could include engineered timber, glulam or steel.
These elements need to be considered alongside the SIP package when preparing the budget.
Preparing panels to the agreed drawings involves more than supplying material. Cutting, routing, labelling and packing form part of the fabrication process.
McVeigh prepares SIP kits for delivery and assembly, with the scope agreed around your project.
See how SIP fabrication works.
Site location, access restrictions, unloading space and lifting arrangements can affect delivery and installation costs.
Sharing these details early helps the team plan how the kit will reach the site and be assembled.
Extension costs depend on the proposed size and specification, plus how the new structure connects to the existing building.
Foundations, access, roof connections and any alterations to the existing property all need to be considered. A smaller extension can still involve substantial design and installation work.
For an initial assessment, send drawings of the proposed extension, information about the existing building and the site postcode.
SIPs aren’t automatically the cheapest option for every project. A useful comparison considers the complete scope, required performance and construction programme.
Factory preparation can reduce work on site, but any saving depends on the design, installation arrangements and the alternative being compared.
Ask suppliers to price equivalent specifications. Comparing a SIP structural package with a completed traditional build won’t give you a reliable answer.
Your overall project budget may also need to cover:
Confirm which items sit within McVeigh’s quotation and which need to be arranged separately.
A calculator can provide an early budgeting indication, but its usefulness depends on the assumptions behind it.
Check the specification, package contents and exclusions. It may not account for your structural requirements, site access or design complexity.
Before committing to a budget, have your drawings reviewed and obtain a quotation for the actual scope of work.
Planning a house, extension or commercial building? Send us your available drawings and we’ll discuss the SIP package your project needs.
Please include your site postcode, intended build programme and whether you require supply only or installation. If your plans are still developing, tell us what stage you’ve reached.
Email build@mcveighoffsite.com or call 0161 368 7700.
October 19, 2026
October 19, 2026
October 19, 2026