TGB Althorpe Summerhouse *ASSEMBLED*


From £1,529.00

TGB Sheds Althorpe Summerhouse is a high quality wooden building, DELIVERED AND INSTALLED in your garden! It features a 12″ roof overhang, arched windows and double doors, and is available in 2 popular sizes, 5×7 and 7×7. OFFICIAL STOCKIST – BUY WITH CONFIDENCE.


TGB DELIVERY: 4-6 Weeks*

*The current lead time for delivery and installation to most areas is 4-6 weeks, although bespoke buildings, or delivery to chargeable postcode areas may take longer. 


TGB Althorpe Summerhouse *INC. ASSEMBLY*

The TGB Althorpe Summerhouse is a high quality, wooden, apex -roofed summer house, made by one of the UK’s most respected timber garden building manufacturers. The TGB Althorpe is a traditionally built British summerhouse, featuring a delightful 12″ roof overhang to the front. It has half-glazed, arched-top double doors with ornate antique ironmongery, and 2x matching windows. The TGB Sheds Althorpe Summerhouse is available in 2 popular sizes – 5×7 and 7×7, all combining traditional style with an unbeatable price.

Our TGB Sheds product range is second to none, featuring hundreds of great quality buildings, accessories and optional extras, however it is difficult to show everything fully on a single web page. We are an OFFICIAL PREMIER STOCKIST of all TGB products, therefore you are welcome to visit our Edinburgh display site to see the buildings in person.



  • FREE delivery*
  • Professionally INSTALLED IN YOUR GARDEN*
  • FREE Brown preservative treatment
  • 12″ roof overhang
  • Mortice lock c/w 2x keys
  • Straight fascias
  • Antique style black hinges and lever handles
  • 16mm nominal (12mm finish) tongue & groove shiplap cladding
  • High quality, slow growing Scandinavian timber
  • T&G floor and roof
  • 2x sizes from 5×7 and 7×7
  • Bespoke options available



Quality Construction

This garden building is manufactured using high quality, slow-growing, sustainable Scandinavian Pine from well managed FSC or PEFC CERTIFIED forests. All models are constructed using 16mm nominal (approx. 12mm finished) tongue and groove shiplap timber walls, along with tongue and groove roofs AND floors, however this can be upgraded to a massive 22mm nominal thickness (approx. 18mm finished) if required. Please note that NO chipboard or OSB is used in the construction of ANY TGB building. Our range of TGB buildings are supplied pre-treated with a Light Brown Eco-Friendly preservative basecoat at no extra charge. A 15-year pressure-treated Tanalised preservative is also available with this model. Strong, smoothed, rounded and planed framing (50x38mm nominal) has been used internally, which is doubled at the corners for extra strength. For security, an internal lock c/w key is fitted as standard, and mineral roofing felt is supplied to keep the roof watertight.



TGB garden buildings are supplied pre-treated with a quality brown, non-toxic preservative base coat. This ensures that your garden building is ready to accept any preservative colour of your choice. Alternatively we can supply them made from long-lasting Tanalised pressure-treated timber with a 15-year anti-rot warranty, or you can have your building factory-painted in a choice of 12x popular colours (maximum 2x colours per building). These look great, and don’t require any additional painting immediately… please contact us for details.

Brown PreservativeTanalised Pressure-treated PreservativePaint Colour Options



Doors, Locking System & Windows

Double doors (1103mm wide) are supplied complete with a mortice lock c/w 2x keys and ornate, antique-style black hinges and lever handles. 4x plain glass fixed windows are supplied as standard with this building.


Professional Assembly Included

We will install your TGB garden building at NO ADDITIONAL CHARGE although some geographical limitations apply. Our PROFESSIONAL ASSEMBLY SERVICE covers approx. 90% of the UK mainland population, and requires non-restrictive access and a suitable base/site.


DIY Assembly Video

Assembling your building yourself can be very satisfying and it has several advantages: you probably won’t have to wait as long for delivery, you can assemble it on a day suitable to you, you can pre-treat the panels beforehand allowing the best possible protection for your building, and we may even be able to offer you an additional discount so you’ll save even more money! TGB Sheds, Playhouses and Summerhouses come with all the fixings and fastenings you need, but to make things even easier, here is an installation video that you can follow showing the assembly of a typical TGB building.



Optional Extras

This garden building is supplied as a full kit, complete with all necessary fixings, fastenings, glazing and roofing materials. Optional extras include professional assembly, framing and wall thickness upgrades, double doors, opening windows, heavy flooring, verandahs, log-lap cladding, toughened glass etc. The building can also be made to a bespoke size or configuration… please call for details.



Please contact us prior to purchase if you have any queries regarding the dimensions, or if you require exact sizes. Roof overhangs will extend beyond the Body Size shown below (all dimensions are finished sizes).

Model Frame Body Size (mm) Height (mm)  Double Door Windows
TGB Althorpe Summerhouse (mm) Depth Width Eaves Ridge Height Width Fixed Open
5×7 TGBALTHRP0507 44×32 1524 2134 1864 2312 1790 1103 4 0
7×7 TGBALTHRP0707 44×32 2134 2134 1864 2312 1790 1103 4 0

Please contact us prior to purchase if you have any queries regarding the dimensions. Sizes shown above are finished sizes (not nominal), however you should note that the roof will extend beyond the Body Size shown above. Information shown above has been supplied by the manufacturer, and is as accurate as possible (errors and omissions excepted), however it is intended only as a guide. This high quality building has an expected lifespan well in excess of 15-years. We recommend that you install the building on a solid, free-draining base, with at least 60cm free space all around for maintenance and to avoid splashback. You should treat all sections with a high quality, spirit-based preservative prior to assembly, and subsequently every year in accordance with the manufacturers instructions. Please ensure that regular general maintenance is carried out on all moving parts, and that the roofing felt is regularly inspected, and replaced if required.



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