Request a quote
Download brochure
If you're planning an extension, you might assume traditional brick and block construction is the only option.
It isn't.
A SIP extension uses Structural Insulated Panels to form the structure of the building. These precision-manufactured panels combine structural strength and insulation, allowing the main shell of an extension to be assembled quickly while delivering excellent thermal performance.
For homeowners, SIPs can offer a modern way to create more living space with less time spent constructing the main structure on site.
What are SIPs?
SIP stands for Structural Insulated Panel.
A typical SIP consists of a rigid insulating core sandwiched between structural boards. The panels are manufactured to the design of the building before being delivered and assembled on site.
Rather than constructing the walls piece by piece and adding insulation separately, you're working with a pre-engineered building system.
While the construction method is different, a completed SIP extension doesn't have to look any different from a traditionally built extension.
What are the benefits of a SIP extension?
Faster construction
One of the biggest advantages is speed.
Because the panels are manufactured for the project before arriving on site, the main structure can be erected much more quickly than with many traditional construction methods.
This can reduce the length of the structural phase and the amount of time your home is exposed to the elements.
It doesn't mean an entire finished extension appears in a few days. Groundwork, roofing, glazing, electrics, plumbing and finishing work still need to happen, but the shell itself can progress quickly.
Excellent thermal performance
Insulation is built into the panel itself.
This creates a continuous, highly insulated building envelope and can help achieve good levels of airtightness when the system is correctly designed and installed.
The result is a new living space designed with energy efficiency and year-round comfort in mind from the beginning.
Precision-built
SIPs are manufactured to suit the design of the extension, including planned window and door openings.
That means much of the accuracy is built into the system before it reaches your home, rather than relying entirely on construction and cutting on site.
Flexible design
Choosing SIPs doesn't dictate how your extension has to look.
You can create a contemporary extension with large areas of glazing and aluminium doors, something more traditional to complement the existing property, or a design somewhere between the two.
Rooflights, bifold doors, sliding doors and different exterior finishes can all be incorporated depending on the project.
SIPs are the construction method, not the architectural style.
How long does a SIP extension take to build?
The structural shell of a SIP extension can be erected relatively quickly once the groundwork is ready and the panels arrive on site.
However, it's important to distinguish between erecting the SIP structure and completing the entire extension.
A finished project can also involve:
- Groundworks and foundations
- Roofing
- Windows and doors
- Electrics and lighting
- Plumbing and heating
- Plastering
- Flooring
- Decorating
- External finishes
The overall timescale therefore depends on the size, specification and complexity of the project.
When comparing companies, make sure you're comparing the time required for the complete project, rather than just how quickly the structural shell can be assembled.
Are SIP extensions energy efficient?
SIPs can provide excellent thermal performance because insulation forms an integral part of the building structure.
The system can also help reduce thermal bridging and achieve good airtightness when designed and installed correctly.
But the panels aren't the only factor.
The performance of the finished extension also depends on its windows, doors, roof, ventilation, heating and the quality of installation.
A well-designed extension should consider all of these elements together.
Do SIP extensions need planning permission?
SIPs don't have their own separate planning rules.
From a planning perspective, you're creating an extension to your home, regardless of whether its structure is made from SIPs or traditional masonry.
Some single-storey extensions can be built under permitted development rights, provided they meet the relevant conditions and limitations. Other projects require planning permission.
What applies will depend on the individual property, size and design of the proposed extension and any restrictions affecting the home.
SIP extensions also need to meet the relevant Building Regulations requirements.
Are SIP extensions cheaper than traditional extensions?
Not necessarily, and we'd be wary of presenting SIPs simply as the cheaper way to extend.
The structural system is only one part of the overall project cost.
Groundwork, size, glazing, roofing, electrics, plumbing, heating and the level of finish can all have a significant impact on the final price.
SIPs can provide efficiencies through faster construction and precision manufacturing, but the more useful comparison is what you're getting for the completed project, rather than the cost of the structural shell alone.
What can you use a SIP extension for?
SIP construction can be used to create many of the same spaces as a traditional extension, including:
- Open-plan kitchen and dining spaces
- Family rooms
- Home offices
- Additional living rooms
- Utility spaces
- Multi-purpose rooms
The best place to start isn't necessarily with the construction method.
Start with how you want to use the space, how it should connect with your existing home and how much natural light you want.
The design and construction can then follow.
Is a SIP extension right for your home?
If you're looking for a well-insulated extension with a precision-manufactured structure and a potentially faster structural build, SIPs are certainly worth considering.
But every home and project is different.
At TCIC Living, we look at the complete space, including the structure, glazing, roof, doors and internal finish, to create an extension designed around the way you want to use it.
Ultimately, the important part isn't whether your extension is made from SIPs. It's what the finished space adds to your home and everyday life.
Thinking about extending your home?
Explore our SIP extensions or talk to our team about the space you'd like to create.