insulated OSB skylight base 800 x 1200 mm upstand
Insulated OSB Upstand 800 x 1200 mm (for Flat roof) Original price was: £230.40.Current price is: £192.00. incl. VAT
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insulated skylight upstand 800 x 1800 mm OSB kerb system
Insulated OSB Upstand 800 x 1800 mm (for Flat roof) Original price was: £299.52.Current price is: £249.60. incl. VAT

Insulated OSB Upstand 600 x 900 mm (for Flat roof)

Original price was: £172.81.Current price is: £144.00. incl. VAT

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Make the most of our limited-time deal before it’s gone for good when the timer runs down.

Details:

  • 15mm OSB
  • 40mm core cavity insulated
  • 6 degrees natural incline across the short side
  • Total Heat Loss Value = 0.63 W/m2k
  • Designed for cold and warm roofs
  • Suitable for all roof coverings
  • Precise sizes
  • Available on the shelf
  • Next Day Delivery

PDFs for Download:

Sold By Manufacturer

Saris Extensions
Saris Extensions
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matthew Kircher profile picture
matthew Kircher
29 October 2026
Google star 1Google star 2Google star 3Google star 4Google star 5
Used Saris extensions twice Very happy both times
Posted on Google Google
Bobby Lush profile picture
Bobby Lush
20 October 2026
Google star 1Google star 2Google star 3Google star 4Google star 5
The delivery driver was excellent and helpful too
Posted on Google Google
S S profile picture
S S
15 October 2026
Google star 1Google star 2Google star 3Google star 4Google star 5
My wife and I came across Saris Extensions while searching for skylights for our extension, and although we were initially unsure about the level of service and the quality of the roof lights, our experience has been exceptional. The service was outstanding, and the product style and quality are genuinely beautiful. We initially ordered 2no 1000 x 1000 rooflights with installation kits. As our extension roof progressed, we contacted Saris Extensions to ask whether we could exchange both units for larger sizes. They agreed immediately, with only a minimal return fee and the simple requirement that the original products remained unopened. The entire process was seamless. Emre, who supported us from the initial purchase through to the exchange, was absolutely amazing — customer service at its best. Their delivery drivers were also fantastic, though it’s worth noting that you will need two people present to safely receive any glazing delivery. We will have to see how the product fares after installation, we have purchased their installation kit and will be following installation guide as per their website. I will provide an update if we encounter any issues, but for now, based on service, communication and product style, we would not hesitate to recommend Saris Extensions. Purchased 800x1500 & 1000x1500
Posted on Google Google
Oliver Rowe profile picture
Oliver Rowe
6 October 2026
Google star 1Google star 2Google star 3Google star 4Google star 5
I bought a flat roof skylight from these guys and after a month of it being on my possession, on the day of fitment I found it to be cracked. I rang the support team and was told to email them. I sent an email with all relevant photos and had very quick responses. They dealt with it very professionally and were very helpful. I could not fault how they handled it.
Posted on Google Google
enquiries Hall Build profile picture
enquiries Hall Build
11 September 2026
Google star 1Google star 2Google star 3Google star 4Google star 5
Really pleased with the skylights I ordered. They arrived exactly as expected and I’m very happy with the quality. I also wanted to mention the delivery driver, who was extremely polite, friendly and helpful. He went out of his way to make sure everything was delivered safely and made the whole experience very easy. Great product and excellent service from start to finish. Would definitely recommend.
Posted on Google Google
Mirsad Bakalovic profile picture
Mirsad Bakalovic
9 July 2026
Google star 1Google star 2Google star 3Google star 4Google star 5
Gabi - Excellent service with flexible delivery arrangement.
Posted on Google Google
Shirley Bunker profile picture
Shirley Bunker
30 June 2026
Google star 1Google star 2Google star 3Google star 4Google star 5
Ordering was quick and easy. Ordered late on a Friday afternoon and was delivered on the Monday afternoon (although I paid the extra for 1-2 day delivery) now just got to wait and see what there like when in. But look good so far. Yes I would recommend so far. If fitting not so good I'll update my post. UPDATE 3yrs later fitting went well all measurements were accurate. They still look good and no leaks or discolouration or misting. Really happy with purchase.
Posted on Google Google
Alan Alan profile picture
Alan Alan
28 June 2026
Google star 1Google star 2Google star 3Google star 4Google star 5
Saris are great. The two delivery guys, Gaby and Paris, we're very helpful. They were very polite and took the 3 rooflighfs off the truck and placed them doiwn with care They spoke very politely to me and answered my questions. This is the 2nd time I've bought from Saris and I'm delighted with the service they give from order to delivery.
Posted on Google Google
rob ballantyne profile picture
rob ballantyne
9 June 2026
Google star 1Google star 2Google star 3Google star 4Google star 5
Great delivery. Gabi was super helpful and polite. Very happy!
Posted on Google Google
bharat malhotra profile picture
bharat malhotra
20 May 2026
Google star 1Google star 2Google star 3Google star 4Google star 5
Fast delivery including good prices
Posted on Google Google
Dan Terpea profile picture
Dan Terpea
31 March 2026
Google star 1Google star 2Google star 3Google star 4Google star 5
I had an excellent experience with the delivery handled by Gabi! It was quite a complex transport, with a very large item that definitely required effort. However, thanks to Gabi’s experience, everything was managed flawlessly. The delivery went perfectly, and the item was smoothly brought inside the house. I wholeheartedly recommend Saris Extension – it was a very good deal at a great price. Once again, big thanks, Gabi!
Posted on Google Google
Camelia Pop profile picture
Camelia Pop
31 March 2026
Google star 1Google star 2Google star 3Google star 4Google star 5
Good product, fast delivery, good communication. Gabi was very helpful, done a great job! Thanks
Posted on Google Google
Romain Kitesurf profile picture
Romain Kitesurf
26 February 2026
Google star 1Google star 2Google star 3Google star 4Google star 5
Shafak and Toni were great on delivery today and helped us move the skylight safe inside the property as I was on my own. Great service and they called before to confirm delivery day
Posted on Google Google
Dean Livingstone profile picture
Dean Livingstone
26 February 2026
Google star 1Google star 2Google star 3Google star 4Google star 5
"I had a brilliant experience with Saris Extensions from start to finish. I ordered a flat roof skylight, and I was honestly blown away by how quickly it arrived. The packaging was incredibly impressive—it was clear they took great care to ensure such a fragile item reached me in perfect condition. An overall amazing ordering experience; I can’t recommend them enough!"
Posted on Google Google
Karyn Gibson profile picture
Karyn Gibson
25 February 2026
Google star 1Google star 2Google star 3Google star 4Google star 5
Gabi was an extremely helpful delivery driver who went above and beyond in what turned out to be a more complex job than first expected. Thoroughly professional and personable. Thank you!

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SPECIFICATIONS

Fully Insulated Upstands

Crafted with precision and innovation, this upstand excels in every aspect, from thermal performance to airtightness.

Our Insulated OSB Upstand is engineered with high-quality, precision-bonded wood strands, ensuring superior strength, consistency, and durability. Designed to meet the highest standards, it provides reliable support for skylight installations.

Advanced XPS Insulation

Thermal Efficiency

Designed to deliver excellent thermal performance, it creates an effective barrier to maintain a comfortable indoor environment while reducing energy consumption.

OSB core

XPS Insulation

Thermal Efficiency

Upstands with Exceptional Strength and Stability

 

The gap between your skylight’s underside and the upstand’s top is critical for weather resistance and air tightness. Our upstand offers a robust seal to safeguard your interior against the elements, eliminating concerns about leaks, drafts, or unwelcome outdoor intrusions.

For skylights on flat or low-pitched roofs, it’s essential to raise them at least 150mm above your finished roof covering and angle them to prevent water pooling on the glass. Our fully insulated upstand meets these requirements, enhancing your skylight’s performance and ensuring a breathtaking view with peace of mind.

Quick and Effortless Installation

  • Smooth Installation
    OSB upstands are designed for ease of handling, ensuring a hassle-free installation process.
  • Uniformity and Stability
    The consistent quality of OSB minimizes the risk of splintering or cracking, providing reliable performance during installation.
  • Time and Cost Savings
    The simplicity of installation saves time and reduces labor costs, making OSB upstands a smart and practical choice for contractors and homeowners alike.

Important: The package does not include screws or pre-drilled mounting holes.

SHIPPING

Free Delivery:

  • Available on all orders over £400 within the London (M25) area.

Delivery Times:

  • Standard Flat & Pitched Skylights: 3–6 working days.
  • Custom Sizes: 3–6 weeks for production and shipping (free delivery).
  • Roof Lanterns, Framed Skylights, Electric Opening Skylights, Walk-On Skylights, Skylight Blinds: 10–14 working days.
  • Glass Balustrades & Juliet Balconies: 4-8 weeks (after approval of detailed drawing)

Delivery Arrangements:

  • Delivery is scheduled Monday to Friday, 8 am to 5 pm.
  • We’ll contact you to arrange a delivery time once payment is complete.

Shipping Options:

  • Enter your shipping address at checkout to view options.
  • Within M25: Our drivers ensure safe delivery. We ask that you or your builders are present to accept the order.
  • Outside M25: We use external couriers. They will contact you to schedule delivery.
  • Extra Economy Shipping: Available for all areas except Northern Ireland and Scotland. In rare cases, you may need to pick up your order from a nearby depot.

Important Notes:

  • Products range from 10kg to 280kg. You may need 2–6 people to assist with unloading.
  • We are not liable for any damage during unloading, as it’s the customer’s responsibility.
  • If no one is available to receive the delivery, we will try to contact you. If unreachable, the order will be returned to our warehouse.

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