Guardian Extension

House extensions with Structural Insulated Panel (SIP) Construction

Transform your home with a Guardian house extension that combines industry-leading, pre-assembled SIP construction from Kingspan (“Tek-Panels”) along with the Guardian Warm Roof System, to create a comfortable and affordable new room with outstanding energy-efficiency.

Guardian home extensions

Guardian extensions use strong, structurally insulated SIP panel walls that come with an insulated roof and double-glazed windows. We can match your existing brick, render or stone walls, as well as the roof tiles, to create a robust and aesthetically pleasing extension to your home.

Contact us today on 0845 564 0628 or feel free to read on to learn more about extending your house.

Guardian™ Roof Key Information

Full Building Control

Full Building Control

For your peace of mind

Beautiful Finishes

Beautiful Finishes

To compliment your home

Energy Efficient

Energy Efficient

Saving your money

Fast Installation

Fast Installation

For your peace of mind

Free Extension Quote

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BiFold DoorsBiFold Doors
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    What are SIP extensions?

    SIP extensions use high quality, prefabrication technology to provide a great way of giving you and your family extra rooms and space in your current home, thus avoiding the stress and upheaval of buying and selling a house.

    What does SIP mean?

    A SIP is a ‘structural insulated panel’ that can be used to build new homes and roofs and to add extensions to existing builds.

    A SIP extension is an extension to your home or property using structural insulated panels that are prefabricated, measured and cut prior to the start of the build. The panels consist of an insulating polystyrene core which is sandwiched between two structural facings. SIPs can be used over the more conventional brick, blocks, or timber frame and there are many benefits of having a SIP extension or roof – as discussed in more detail below.

    Can you make your own SIP panels?

    You can make your own SIPs however the issue that makes the Kingspan SIP panel so special is the manner in which the insulation is adhered to the plywood. Regular gluing and sticking of insulation to plywood over time degrades and can cause the board to warp and delaminate from the insulation, ultimately causing the panel to fail. Kingspan paid around £30 million for the chemical compound to ensure their panels remain fit for purpose over the lifespan of the construction.

    Are SIPs extensions cheaper?

    Structural insulated panel extensions are custom-made for your property and so are typically more expensive than using a regular timber frame. When the project in its entirety is considered, however, from time to energy savings, the end costs are comparable.

    What are the benefits of SIP home extensions?

    If you need to expand your property or find that you are running out of space, home extensions can be a cheaper and less stressful alternative to having to sell your property and move into a larger one. Some stand-out benefits of SIP extensions are:

    • Their pre-assembled, factory-engineered modular construction provides superior build quality as well as
    • Superior thermal efficiency – fantastic for the winter months
    • The SIP framework for an extension can be constructed in as little as two days
    • Zero on-site waste
    • A wide range of available colours and finishes and
    • Accelerated planning approval.

    Not to mention, when you buy a house extension with Guardian, you will receive a bespoke design service – where we work with you to advise, recommend and design the best solution for you – alongside technical support from start to finish and a full guarantee.

    Improved insulation and thermal efficiency

    The energy-efficiency of our home extensions are outstanding and among some of the most energy saving home extensions available, with a U-value of 1.0 W/m2K.

    Guardian Tiled Conservatory Roof

    House Extension Types and How Can They Solve My Problem?

    Guardian Bedroom Extensions are built using SIP Panels and are fabricated off-site, then delivered and erected within two to three weeks, avoiding the chaos and upheaval of having builders on site for months on end. Being of modular construction, they come with insulated roof and walls, double-glazed windows and strong, steel-reinforced structures, and are an affordable alternative to a traditional brick-built structures. We can match your existing brick, render or stone walls as well as the roof tiles, so the completed room matches the rest of your house.

    Kitchen Extensions

    A generous open-plan kitchen has become the epicentre for modern living, and SIP Panel kitchen extensions are the ideal way to enlarge your existing kitchen. Not only will this extension provide the additional space you require, it will also add value to your property. Remodelling an existing kitchen within the available space always calls for compromises. But a kitchen extension allows you to decide how much space you really need, and to accommodate those latest innovations such as an island or breakfast bar. Our kitchen extensions also provide a greater supply of natural light, creating an airy feel where previously the space may have been dark and uninviting.

    Bedroom Extensions

    There often comes a point where a family simply needs more space in the home, but moving to another property is not a practical solution. This may be due to having to accommodate more family members, whether additional children or a relative in need of regular care. In which case, improving the house by adding a bedroom extension is often the most cost-effective solution. SIP Panel bedroom extensions are not restricted to ground floor applications, but can be used to extend at first floor level over an existing single-story structure that has adequate foundations. This is possible because a lot of the component parts are manufactured using state-of-the-art lightweight materials, and can help to transform a home where there is limited garden space to expand into.

    Conservatory Extensions

    For more than fifty years, conservatories have been the most popular method of extending a private house. They were relatively simple to design and install, took advantage of simpler planning regulations, and consequently were not as expensive to construct as a traditional brick and tile extension. However, traditional conservatories suffer from two major drawbacks – their insulation efficiency is compromised by the amount of glazed area, making them cold in the winter and hot in the summer, and their construction means that design variations are somewhat limited. Today, home-owners are looking not only for something a bit more special in design, but also for cost-effectiveness in both build and running costs. Whether you are looking for a traditional-style conservatory extension, orangery, or to create a garden room connecting the interior of the house to the exterior garden space, a SIP panel conservatory extension is ideal. It not only takes advantage of the simplified planning processes afforded by modular construction, but enables the use of modern materials greatly enhancing the insulation efficiency of these extensions.

    Living Room Extensions

    Remodelling an existing living room within the available space always calls for compromises. Living room extensions allow you to decide how much space you really need, and to allocate it to those different usages that modern families put it to. With a larger living space it is possible to accommodate both sitting and dining areas, or a quiet area for reading away from a more lively area of the home. It can also be designed to incorporate other innovations such as Bi-Fold Doors to open-up a full side to the exterior allowing seamless movement between the interior living space and external patio areas. These doors incorporate the same insulation efficiencies as the walls, so that when they are closed the interior retains its heat during the winter months, whilst the full-glazing allows the same panoramic garden view as when they are open.

    Utility Room Extensions

    A generous open-plan kitchen has become the epicentre for modern living, but it is not always possible to remodel an existing kitchen within the available space and retain all of the necessary equipment of modern living. Adding utility room extensions alongside the kitchen allows you to remove some large white goods items, such as washing machines, tumble dryers, freezers, etc, and thus create more space for remodelling the existing kitchen area to accommodate those latest innovations such as an island or breakfast bar. Or you may just need some extra space behind the garage for an office where you can get away from the hubbub of family life and concentrate on working from home, or to create a workshop for that hobby that is beginning to expand into a lifestyle choice.

    Rear Home Extensions

    There is no doubt that the most practical area to expand a house is into the garden space to the rear. This may be to create some working space for a hobby, or perhaps due to a switch in work priorities away from travelling to the office in favour of working at home. Adding modern ground-floor rear home extensions can be the answer to such scenarios, because they can essentially be designed exactly to the user’s needs. One of the most popular reasons for rear home extensions is to create a garden room, essentially connecting the interior of the house to the exterior garden space. A SIP panel extension is ideal for this type of application, as it can be designed to incorporate other innovations such as Bi-Fold Doors that can open-up a full side to the exterior allowing seamless movement between the conservatory and patio areas.

    How long does a house extension take?

    We advise that Guardian house extensions typically take two to three weeks but have found 16 days to be the average length of installation.

    Our modular system allows for accelerated planning permissions and you receive technical support from start to finish. We have perfected our installation and design processes for your peace of mind and to make the design and installation process very easy for you. All of our extensions are fully guaranteed and we will help you enjoy your brand new extension in just a few weeks instead of a few months.

    The panels themselves go up and join very quickly, the panels interlock together with ease and this means the walls and roof of the extension can be constructed within days of the groundwork being completed which results in a significant reduction of labour time being needed for this initial stage, therefore, reducing the cost of your overall build. Due to the speed of putting the structure together, a home extension can be walled and roofed much quicker than other forms of construction making it easier and quicker to knock any walls through with the property always remaining watertight.

    The drying times when using a SIP structure are also much quicker and this means the building or extension can be fully prepped for electrics and plumbing much more quickly than using traditional construction methods, such as timber frames.

    As the SIP panels are measured, cut and built off-site in factory quality controlled conditions this means the initial stage of construction is not subject to site weather conditions which can often delay an extension or a building project.

    Lastly, a SIP extension is a lot easier to project manage, as you are less reliant on different trades turning up and arriving on the right day and time. Home Extensions can take anything from 8 to 16 weeks or longer, depending on the size of the extension, the weather, and the speed and reliability of the labour. Often, people experience builders disappearing to start other jobs and this makes a project even more stressful. Some SIP extensions can cut build times by up to 70%.

    Do I need planning permission for a new house extension?

    Our modular system allows for accelerated planning permissions and you receive technical support from start to finish. We have perfected our installation and design processes for your peace of mind and to make the design and installation process very easy for you. All of our extensions are fully guaranteed and we will help you enjoy your brand new extension in just a few weeks instead of a few months.

    Do SIPs need foundations?

    Sips do require foundations when used as an extension on a property. The construction of an extension is dictated by the current building regulations for the erection of an extension and should always be completed under local authority guidance. They are basically an alternative building material to concrete blocks, though far more thermally efficient.

    What are the components of a SIP house extension?

    1. Ridge cappings to match roof tiles or slates
    2. Choice of roof tiles or slates
    3. Standard rainwater systems
    4. Breathable Guardian waterproof membrane
    5. Exterior-grade plywood
    6. Structural pre-engineered frame
    7. Ventilated roof to eliminate condensation
    8. Three layers of high performance rigid Kingspan insulation board (125mm) with a U-value 0.18 W/m.K in England and Wales and 0.15 W/m.K in Scotland
    9. Choice of external finish
    10. Kingspan TEK Building System
    11. Internal flooring
    12. External flooring
    13. Velux Roof Windows
    Guardian Extensions UK

    How much is a house extension?

    While installing an extension to your house is a significant investment, it will increase the value of your home in the long run. When you choose to install one of our Next Generation Home Extensions, you are installing the most advanced and most energy-efficient extension on the market. To get a quote for your home, get in touch with us today.

    Will a home extension add value to my property?

    Some homeowners have seen impressive increases in value from certain extensions. For example, creating a double bedroom with en-suite facilities can increase the value of a home by 23% with extra bathrooms increasing the value by around 6% and another double bedroom 12%. This is huge considering the cost of installing a modular extension and the energy efficiency that you receive from a Guardian house extension leads to significant future savings. If you are looking to trade homes, you can potentially swap to a bigger home as you are now at that price range. A 23% or even 6% increase is a lot for higher value homes which allows you to continue to climb the property ladder.

    Get Your Next Project Started Now

    Guardian Warm Roof logo, indicating that NECS fabricates and fits the Guardian Roofs for conservatory roof replacements and home extensions Guardian Warm Roof Certified Fabricator trust mark Kingspan Logo indicating that NECS fabricates and fits Kingspan SIP construction technology for house extensions VELUX Certified Installer trust mark VELUX logo indicating that NECS supplies and fits VELUX Window Products

    LABC Registered trust mark to show that NECS is Local Authority Building Control registered LABSS Registered trust mark to show that NECS is Local Authority Building Standards Scotland registered CERTASS logo indicating that NECS is government certified for the building fabric trade