STANDARD INCLUSIONS

100mm
SIP Panels

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Request a free site visit to discuss your project. We’ll assess your space and plan your build around your garden size, build dimensions, preferred finishes and interior spec.

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As standard, all our SIP extensions and garden room builds are finished with high-quality, naturally insulating structurally insulated panels (SIPs).

Our SIP panels are used throughout your walls, flooring and roof, creating an airtight and insulated structure, which can be used all year-round. They’re far mote energy-efficient than traditional builds, helping your extension or garden room stay warm in winter and cool in summer.

With SIPs, you’ll get a custom garden building that’s stronger, warmer and more efficient from day one.

See Our Garden Rooms

See Our SIP Extensions

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100m SIPs as Standard

All our SIP extensions and garden rooms are built using 100mm SIP panels as standard. This thickness provides an excellent balance of strength and insulation.

This means lower heating costs and better temperature control in a garden structure that is looks like a true extension of your home, not just an outdoor shed or workspace.

Our 100mm SIPs deliver reliable performance from day one, making them the ideal foundation for a high-quality, energy-efficient build.

Upgrade to 150mm SIP Panels

For even higher performance, we offer an upgrade to 150mm SIP panels. These thicker structurally insulated panels provide noticeably improved insulation and soundproofing benefits.

These panels are suited to more functional builds, which are going to be used heavily in the winter (like with garden annexes and offices). Or in instances where you want extra sound reduction like with music rooms or man caves.

Upgrading to 150mm SIPs means your garden room or extension will be able to hold heat for longer, stay cooler on hot days and feel ever more like part of your home main home – all while keeping energy cots down.

SIP Panelling FAQs

What are SIP panels and why do you use them?

SIP panels (Structurally Insulated Panels) are strong, insulated building panels used to create the walls, floor and roof of our garden rooms and extensions.

They offer excellent thermal performance, quick installation and a clean, solid finish. This makes them perfect for comfortable, long-lasting spaces.

What’s the difference between 100mm and 150mm SIP panels?

100mm SIPs come as standard and offer great thermal performance for most garden room and extension uses.

150mm SIPs provide even better insulation and sound reduction, making them ideal if you want the highest comfort levels or plan to use the space heavily through the colder months.

How long does a SIP garden room or extension take to build?

Using SIP panels, we can build and furnish your garden rooms and SIP extensions in just under 2 weeks.

Most garden rooms can be installed within a few days once the base is ready. Using SIPs for an extension is also faster than traditional constructions.

Can I add skylights or roof lanterns to a SIP building?

You can, but not directly onto a SIP roof.

If you’d like skylights or a roof lantern on your build, we simply install an insulated timber roof (or upgrade to an EPDM rubber roof), allowing us to fit your chosen glazing safely and securely.

Can SIP buildings be customised?

Absolutely, you can choose layouts, cladding styles, finishes, glazing options and internal features to create a space that suits your home and how you plan to use it.

Do SIP garden buildings need foundations?

Any garden building will require a foundation. We can build on a concrete base, ground screws or another suitable foundation depending on your site.

We can guide you on the best option to ensure a stable, lasting structure.

CLIENTS TESTIMONIAL

Our Clients & Feedback

Rating :

The people in the office were really helpful, efficient and knowledgeable. If I had any technical questions like how they cure the wood or if they supply membrane for anti mold and frost they had the answer. The guys that came to install the shed were great too. Polite, funny and grafted. Honestly can’t fault it.

Sam Nickson

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Can not praise the guys here enough. absolutely amazing from start to finish. we had a plan in mind and they made every step of the process so simple and i felt like they actually cared they addressed all my concerns and left me with complete peace of mind. My final design is absolutely beautiful i honestly could not be happier would highly recommend 5 stars

shannon frye

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Greenleaf produced an amazing turnaround from what was just an idea a couple of weeks ago to a transformation of an old bunker space into a very tidy looking summerhouse/potting shed!! Dan, Ashley and Shane were easy to talk to implement my ideas and communication was excellent . Despite poor weather the building went up and was a perfect fit. Can’t wait to christen it properly with friends ! Thankyou very much!

Chris Orange

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Well what can I say.... The team were absolutely perfect. They kept me in contact through all stages of the build, including contacting the subcontractors for plastering and electricals. The only they they were unable to do was get my ethernet ran through the attic to the garden office, but they did run it until the last point before a ladder was required! Dan and team did such a great job. The frame was up in one day as they were able to cut the SIPs in the yard. They managed to get me bifold doors at a discount, which helped with finances too. Great leeway where needed and EXCELLENT budget consciousness from the team. They built exactly what I wanted, for exactly as much as I was willing to pay Incredible work.

Chris Lovelock

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We had our second summerhouse installed back in September last year, we are absolutely chuffed with it! We’ve had no issues whatsoever with green leaf they were amazing from start to finish helped with all our questions, the team are hardworking, friendly and great at what they do! I have recommended these guys to many friends and family members and will continue to do so. Keep up the great work!

JennyJ

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Superb experience throughout. Very prompt and proffessional service. The team were super friendly and very skilled. Great quality materials. After sales also good, coming back to make some slight changes (which were my fault) ... I cannot fault them. Highly recommended ... Thank you Dan and Team!

Ian Boden

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Recently purchased a garden room and the service from start to finish was faultless. A home visit was quickly arranged to talk through our requirements, Dan the owner was great and quickly provided a very competitive quote, I agreed the price and booked for the work to be done. The team were friendly and professional and delivered everything I wanted and more, the quality of work is excellent. I was so happy with the work that had been carried out I booked for them to come back and do some decking for me. People that have seen the garden room are also impressed, Can’t recommend highly enough.

Gareth

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I highly recommend Dan and his team. I had a garden office built that attached to the side of my house and from start to finish they were amazing. I had a single door on the front and French doors at the back opening onto the garden. The build also included insulation, electrics, heating and plastering. I’ve wanted something like this for ages and finally been able to have it done. I explained what I wanted and they certainly delivered above and beyond my expectations. Thank you so much Dan, Kate and team.

KIRSTY HARPER

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Can't recommend the team at Green Leaf enough! From our initial discussions with Katie to getting the plan written up and then getting the work done in 2 days! Dan was very precise and kept to the schedule, although they quoted us until the end of the week but they completed the foundations and build with 2 days!!! The finish is far better than what we expected and we look forward to doing the next part! Thank you Dan, Katie and the whole team!!!

Simon

Rating :

The work we’ve just had done by Dan and his team is fantastic. From start to finish they were totally professional and all of the workmanship is excellent. The communication from Dan was great at every stage . We would highly recommend Greenleaf and would use them again for sure Thankyou guys 👍🏼

Malcolm Thomad

Rating :

1 had my 10 x 9 ft bespoke Shed/Summer House made and installed today. Dan and the boys did a great job, really pleased with the end piece! Great guys.. I would highly recommend! Many thanks Dan, keep up the good work mate! Andul.

Hafiz Khan

West Bromwich

Rating :

My Field Shelter and Summer House were completed today to satisfaction and with great attention to detail by Dan and Sean. They were most helpful with additions I required on the Field Shelter which looks superb. I will highly recommend Green Leaf Garden Buildings for quality buildings and great customer service. Well done.

Lin Henson

Shrewsbury

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Dan and his team designed and built my 26 x 10ft Bar/Shed. The finished building was even better than I could have imagined, the attention to detail was unbelievable. Nothing was too much trouble, even changing doors after I changed my mind. Materials and workmanship was second to none. Would highly recommend Green Leaf Garden Buidings to anybody looking for an extra room or shed in the garden. Top class work and even better people!

Dan Bryant

Heath Hayes

Rating :

These guys built and installed a fab 19 x 10ft garden Workshop for us. We are really pleased with the service and the quality of this building. If you need a Shed, Garden Room, Workshop, we highly recommend Green Leaf. Thanks guys.

Chasmo Potts

Downham Market

Rating :

Had my delivery today of my Summer House which I am using as a Nail Salon. These guys were amazing, it has been perfectly made and installed. Such good quality. I am so pleased and couldn't recommend them more. BRILLIANT. Thank you and when I have furnished I will send you pictures.

Sharron Vonhof

Peterborough

Rating :

I spoke to Dan early on about my requirements for a 24 x 14ft Shed which would be used for a gym and a 6 x 4ft Pent Shed for some bikes. The whole process was seamless. Dan went out of his way to come to my house and advise me, making sure that I had enough room and to give some ideas for the final look. The installation was fantastic and Dan and Sean were really professional throughout.

Ian Cook

Pelsall

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My Summer house was put up today. Yay. I'm so so happy with it. The two men that turned up were extremely hard working and very pleasant. I'd highly recommend this company.

Michele Davies

Brownhills

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These guys built us a summer house - we had a particular design in mind and we gave them a picture and they reproduced it accurately for us! Communication was great from them and we are really pleased with the finished product!

Katherine Davis

Hednesford

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Great quality summer houses. I would highly recommend these guys. Very polite and great at keeping you updated!

Gary Taylor

Cambridgeshire

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The whole process from finding out about the products, designing what we needed, ordering it and then having it built was ridiculously easy. Lots of help and the building process was amazingly hassle free. Would recommend them without hesitation.

Matthew W

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Having just had our Garden Room built we couldn’t be more delighted. A place to relax, the building work and material are of top quality, really impressed with all the work, the build, plastering, electrics etc… Green Leaf team were polite and hard working, thanks to Dan and his team for a 5* experience start to finish.

Chris Pearson

Rating :

The people in the office were really helpful, efficient and knowledgeable. If I had any technical questions like how they cure the wood or if they supply membrane for anti mould and frost they had the answer. The guys that came to install the shed were great too. Polite, funny and grafted. Honestly can’t fault it.

Sam Nickson

Rating :

I cannot recommend Green Leaf Garden Buildings highly enough!!! From Shane visiting us to discuss ideas to Ashley in the office promptly answering all of our (many many many) questions to Dan, Shaun and all the guys installing the Garden Building - every aspect was exceptional and highly professional. I am blown away by how I was treated as a customer. Everything was clearly explained to us including the internal dimensions (important as we are a tall family!!), the electrics and the finish to ensure that we were completely happy.....

Bally Athwal

Rating :

Dan and the team helped make a rear garden extension for me after finding them on social media. From start to finish every step was clear for me and they accommodated for any changes or issues found during the build. The team were friendly and professional and offered solutions to issues in a prompt manner, their receptionist Ashely was genuine and friendly and kept me up to date with what I would need to pay and clear with everything. The end result could not of been better and I now finally have a space I can call home. I thoroughly recommend them. Will cross paths again 🙂 Thanks again.

Craig G

Rating :

Most definitely highly recommend Green Leaf Garden building. The team are amazing from the start. Our project was done to our specification exactly how we requested. The Quote they give is the price you pay! no upfront fees. You pay once installed & are happy. Installed within a week, and don't mind travelling to you. Excellent service from start to finish. Thank you Green Leaf team!!

K Colley

Rating :

A Great quality summer house and fab installation service thankyou

Susie

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Dad decided to upgrade his lean too, to a garden room, ready for the sun and the birds to visit his garden. Dan and his team from Green Leaf Garden Buildings Limited were absolutely amazing thank you. The attention to detail was second to none. We would highly recommend them for quality finish, value for money, communication and generally all round good people. So pleased with the outcome. Thank you Green Leaf Garden Buildings ltd

Cat Thompson

Rating :

Great service from start to finish, highly recommend Green Leaf Garden Buildings. They helped design, custom build and install our bespoke 22 x 10 ft Pent Roof Shed, Storage Area with attached Games Room/Summer House. So pleased with how it has turned out, cant thank them enough. Great group of Carpenters who have done a quality job. Nothing was too much trouble, would highly recommend them 5* Service.

Suzanne Jayne

Tamworth

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Garden Buildings News

Green Leaf Garden Buildings latest news and advice around all things bespoke garden buildings.

Learn More

100mm
SIP Panels

Get Your Free Site Visit

100m SIPs as Standard

Upgrade to 150mm SIP Panels

SIP Panelling FAQs

Our Clients & Feedback

Request a Quote

Garden Buildings News

How to Dismantle a Garden Shed

Can a Garden Room Increase Your Property’s Value?

12 Tips for Keeping Rats Out of Your Shed

How to Insulate a Garden Room

Soundproof Your Garden Music Room

What is the Best Base for a Garden Building?

Company Information

Top Links

Newsletter

100mm SIP Panels

Get Your Free Site Visit

100m SIPs as Standard

Upgrade to 150mm SIP Panels

SIP Panelling FAQs

Our Clients & Feedback

Request a Quote

Garden Buildings News

How to Dismantle a Garden Shed

Can a Garden Room Increase Your Property’s Value?

12 Tips for Keeping Rats Out of Your Shed

How to Insulate a Garden Room

Soundproof Your Garden Music Room

What is the Best Base for a Garden Building?

Company Information

Top Links

Newsletter

100mm
SIP Panels