6.1m × 4.27m RD SIPs Annex Kit
Create more space this Winter with an RD SIPs Annex Kit. This complete annex kit is designed to provide a practical, comfortable and energy-efficient building shell, giving you the perfect starting point for creating additional space at your property.
Create the Space You Need
Whether you're looking to create self-contained family accommodation, guest accommodation, space for relatives, a home office, studio or additional living space, this RD SIPs annex kit provides a highly insulated structural system to get your project moving.
What's Included
- 6.1m × 4.27m building footprint
- 0.61m roof overhang
- 147mm PUR-bonded SIP panels
- High-performance insulated construction
- U-value of approximately 0.18 achievable
- Designed around your project requirements
- UK manufactured SIPs
- UK-wide supply available
Winter Sale
Make the most of our Winter sale and secure this 6.1m × 4.27m RD SIPs Annex Kit with a 0.61m roof overhang. Get your project started and create the extra space you've been looking for.
With approximately 26m² of floor area before allowing for wall thickness, this kit offers a substantial amount of additional space while taking advantage of the speed and thermal performance of SIP construction.
Enquire About the Winter Sale →Why Buy an RD SIPs Annex Kit?
Whether you’re creating extra living space for family, a private guest suite, or a self-contained annexe, an RD SIPs annex kit gives you a fast, energy-efficient and practical way to build.
Our Structural Insulated Panel (SIP) annex kits are designed to make construction quicker and more predictable while creating a comfortable space that can be enjoyed throughout the year.
A Faster Way to Build Your Annexe
SIP construction combines structural strength and insulation within a prefabricated panel system. Because your annex kit is designed around your project and prepared before arriving on site, the main structure can be assembled much faster than many traditional construction methods.
- Faster to erect than many traditional building methods
- Reach the weather-tight stage sooner
- Reduced time on site can help lower labour costs and disruption
- Ideal where building work is taking place alongside an occupied home
Designed for efficient construction
SIP panels combine structure and insulation into one engineered building system, helping to simplify the construction process and reduce the amount of work required on site.
A Warm, Energy-Efficient Space
An annexe should feel like a proper part of the home, not an outbuilding that’s difficult or expensive to heat.
SIPs create a highly insulated building envelope designed to retain heat and provide comfortable internal temperatures throughout the year.
- 147mm PUR-bonded panels can achieve a U-value of 0.18
- Reduced heat loss can help lower ongoing heating requirements
- Excellent thermal performance for year-round use
- A comfortable environment for living, working or accommodating family
Professional-Grade Panels with Real Certification
The quality of an annex kit starts with the panels behind it. RD SIPs supplies certified SIP panels manufactured to audited standards, giving you confidence in the system being used for your project.
(STA) Member
SIP Mark Systems
Certified
Silver
Britain
Predictable Quality, Manufactured in Controlled Conditions
Traditional construction can be affected by weather, site conditions and variations in workmanship. SIP construction moves much of the preparation into a controlled manufacturing environment.
Controlled Production
Panels are produced in controlled conditions to help maintain consistent manufacturing quality.
Traceability
Full material and production traceability helps provide greater confidence in the system supplied.
Workshop Dry-Fitting
Panels can be dry-fitted in the workshop to help reduce potential errors before they reach site.
PUR Auto-Bonding
PUR auto-bonding helps prevent delamination and supports the integrity of the panel system.
Accurate Manufacturing
Precise manufacturing helps simplify installation and assembly on site.
Less Site Disruption
Efficient panel assembly can help reduce the duration and disruption associated with construction work.
Designed Around Your Annex Project
Every property and every annexe is different. Your SIP kit can be designed around the dimensions, layout and requirements of your project rather than forcing you into a one-size-fits-all structure.
Whether you’re planning accommodation for relatives, additional guest space or a larger self-contained annexe, our team can help you develop the right SIP solution.
- Guidance through the design and planning stages
- Advice on foundations, openings and roof design
- Kits designed around your project requirements
- Installation and best-practice fitting guidance
Less Waste and a More Efficient Approach to Building
SIPs can provide a more efficient construction method both during the build and throughout the life of the annexe.
- Precise off-site manufacturing can help minimise site waste
- Highly insulated construction helps reduce ongoing energy demand
- Faster assembly can mean fewer days of construction activity on your property
- Efficient use of materials through a pre-designed panel system
Clear Lead Times and Straightforward Supply
Once the design is agreed, your annex kit can be manufactured and prepared for delivery to site.
House and building projects are typically supplied within 4–8 weeks, subject to design and scheduling.
Delivery planning and communication throughout the design and manufacturing process.
- Clear communication throughout the design and manufacturing process
- Delivery planning to help make installation as straightforward as possible
What’s Included in an RD SIPs Annex Kit?
Your annex kit is designed around your individual project and can include the structural SIP components required to create the building envelope.
Create the Extra Space Your Property Needs
Whether you’re planning a self-contained annexe for a family member, additional guest accommodation or simply need more usable space, SIPs offer a fast and energy-efficient way to bring the project to life.
Send us your drawings, or provide a sketch and dimensions. Tell us your location and target timescale and we’ll advise on the appropriate panel specification, lead time and provide a clear quote.
Talk to RD SIPs About Your Project →