Future Rooms, a long-established name in the garden room industry, offer SIP's kits for use as house extensions and have recently launched a new website showcasing the option.
You can supply FutureSIPS with your plans, and they will calculate the panels you require, or they have in-house designers who can draw up a design in consultation with you.
The FutureSIPS team will manufacture your kit to order and deliver it for your contractors to install.
The FutureSIPS website explains what is included in their flat pack extension kits, and there is a Home Extension Kit Price List that gives you price guides for different sizes and styles of hose extension.
SIPs create a highly insulated core structure and are one of the quickest ways to add an extension to your home. Check out the FutureSIPS website to learn more about their flat pack extension kits.