Fortis – 12ft x 8ft SIP Insulated Workshop
Fortis – 12ft x 8ft SIP Insulated Workshop
Delivery date confirmed when we call you Delivery details
What’s included?
- As standard
- The building as described in the specification below. Optional extras, such as bases and upgrades, are priced separately.
- Lead time
- Delivery date confirmed when we call you – we’ll give you a closer estimate when we call to confirm your specification and order
- Base
- Needs a firm, level base, ready before it goes up. Base guide
- Access
- Tell us about narrow gates, steps or slopes before you order – you can note them in My Project.
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✓ Finance & Klarna available – spread the cost
✓ Expert advice from our local team
✓ See buildings at our display site near Tamworth
Opens your quote with this building and the size you have picked already added.
Delivery & installation
Made to order. We’ll go through lead times, delivery and installation with you when we speak – nothing is ordered with the manufacturer until you’re happy.
Delivery date confirmed when we call you.
We deliver to mainland England, Scotland and Wales.
Questions? Ask Craig – 14 years in the trade, over 1,000 customers helped
Not sure it’ll fit? WhatsApp us a photo of your space and we’ll tell you which size works. Real people, 7 days a week.
Our Display Site at Buzzards Valley, Tamworth B78 3EQ: Our display buildings can be viewed seven days a week — ring or book if you’d like someone to show you round. Not every model is on display, so call first if you want to see a particular one.
Quick questions
Do I need a base?
Yes – every garden building needs a firm, level base, ready before your building is put up. Where we sell a matching base for this building, you’ll see it as an option above.
Prefer concrete? Our partner Midland Base Works lays precision concrete bases – ask us if they cover your area.
Getting the size right: the size in a building’s name (for example “8x6”) is a rounded, nominal size. The real floor or base footprint can be a little different, and the roof usually overhangs further. Build your base to the manufacturer’s base or floor measurement, not the name.
Can’t see the exact base size for your size on this page? WhatsApp us before you lay a base and we’ll check it with the manufacturer.
Do I need planning permission?
Many garden buildings don’t, but some do – it depends on the size, the height and where it goes in your garden.
Try our free 2-minute Planning Permission Checker or read the planning permission guide.
When will it arrive?
Delivery date confirmed when we call you.
We’ll call you, usually within 24 hours of your order, to confirm the details and the current lead time. Not ready yet? Delivery can usually be pushed back to suit you – order now and have it delivered later.
What guarantee does it come with?
Guarantee terms vary by manufacturer – ask us and we’ll confirm the cover for this building.
Can I see buildings in person?
Yes – our Display Site at Buzzards Valley, Tamworth has a selection of buildings on show, open 7 days. We don’t have every model on display, so give us a call before you visit if you’d like to see something in particular, or book a time if you’d like someone there to show you round.
Or see real installs in our customer gallery.
💳 Spread your payments over up to 10 years
Low, flexible monthly payments through our finance partner Ideal4Finance – quick online application, decision often within 24 hours. Finance is subject to status.
Or pay with Klarna at checkout – Pay in 3 interest-free monthly payments, or pay in 30 days. Eligible orders, subject to status.
Description
The Fortis is a fully insulated garden workspace built from Structural Insulated Panels (SIPs) in the walls, roof and floor, so it stays far more comfortable through winter and summer than a conventional timber workshop. This 12ft x 8ft model suits a serious home workshop, studio, hobby room or creative space you want to use all year round. It comes with steel-reinforced uPVC doors and windows, double-glazed with toughened glass, and an EPDM rubber roof.
Key features
- SIP construction throughout: insulated walls, roof and floor for a more stable temperature, less heat loss in winter and less heat gain in summer
- Slim 72mm insulated walls; Shire's calculations put their thermal resistance on a par with roughly 200mm of solid softwood log wall, without losing the floor space that thick log walls take up
- LP® SmartSide® engineered exterior with an embossed wood-grain finish, made to resist moisture, fungal decay and insect damage, and less prone to splitting, cracking and warping than ordinary timber boards
- Factory primed, ready for you to paint in the colour of your choice, and easy to repaint later. It must be painted to keep the guarantee
- Steel-reinforced uPVC door with multipoint locking
- Opening uPVC windows with 28mm double-glazed toughened glass units
- EPDM rubber roof covering supplied: a flexible, low-maintenance, weather-resistant finish with very few joints, with a 20-year guarantee and a life expectancy of 50 years
- 10-year limited product warranty
- Layout to suit your garden: we confirm the door and window positions with you after you order
Specification
- Walls: 72mm SIP panels: 11mm OSB, 50mm graphite-enhanced EPS PlusTherm insulation and 11mm OSB3 internal face (a practical surface for workshop use), with a 10mm LP SmartSide engineered exterior board
- Exterior finish: LP SmartSide engineered wood siding with embossed wood grain, supplied factory primed for a compatible exterior-grade paint
- Roof: low-pitch pent roof built from approx. 122mm insulated SIP panels (100mm EPS insulation), U-value 0.27 W/m²K, with EPDM rubber roof covering (20-year guarantee) and fascia/roof-edge finishing parts supplied
- Floor: approx. 72mm insulated SIP floor with a 12mm plywood upper surface (EN 314-2 Class 3 exterior bond), U-value 0.49 W/m²K, on pressure-treated timber floor bearers
- Doors: single steel-reinforced uPVC door with multipoint locking, left- or right-hand hung
- Windows/Glazing: opening Rehau Total 70 uPVC windows, Anthracite Grey grained foil (RAL 7016), 28mm double-glazed toughened glass sealed units
- Treatment: no wood preserver needed. The exterior is factory primed and must be painted to keep the guarantee; cut edges, joints and fixings are finished after assembly
- Guarantee: 10-year limited product warranty; EPDM roof 20-year guarantee
- Size: 12ft x 8ft
Choosing your layout
No need to choose a layout now: the price is the same whichever you pick. After you order, we'll go through the door and window positions with you and send you the drawing to confirm before it's made. Want to talk it through first? Call us on 01543 398778.
Extras not shown in the options may be available on request. Just ask and we'll quote.
Delivery & installation
Delivered flat-packed, ready for self-assembly, or choose the Assembled by Shire option and Shire's own team will build it for you. Prices include delivery to our standard delivery area; some areas further afield (for example the Scottish Highlands and islands) carry a delivery surcharge. We'll confirm this before you order.
The Fortis must go on a level, stable, free-draining base, with a damp-proof course (DPC) or EPDM strip under the bearers and airflow beneath the floor. Keep soil and standing water away from the building. The primed panels can be painted before assembly for an even finish, then touched up afterwards over the joints, fixings and any cut edges.
Ground screw base
A Gorilla Base PRO ground screw base, sized for this building, can be ticked above when you order. It comes with your building and is not sold separately.
Delivery
Prices include delivery to most of England. A delivery surcharge applies to these postcode areas: DD, KA, DG, EH, G, ML, TD, TQ, TR, PL, SA, LL, CF, DT, TA, EX, LD, SY, FK, KY, PO, AB, PH, PA, IV and KW – we'll confirm the cost before you order. Shire can't deliver to Northern Ireland, the Channel Islands, the Isle of Man, the Scottish islands or parts of the Highlands (BT, GY, HS, IM, JE, ZE).
Delivery & installation
Delivery terms vary by brand and product – please check the product description above. Most buildings are made to order by the manufacturer and delivered direct to you – see our delivery & installation page for typical lead times, bases and installation, or contact us for your postcode.
Finance
Spread the cost of your garden building over 3 to 10 years, on orders from £1 to £30,000. Find out more and apply online. Finance is subject to status.
You can also pay with Klarna at checkout – Pay in 3 interest-free monthly payments, or pay in 30 days. Options depend on your order and Klarna’s checks, and Klarna’s terms apply.
Need help choosing?
Call 01543 398778 or send us a message – we're happy to talk through sizes, bases and options.
Or read our size guide, base guide, planning permission guide and warranty & guarantees – or try our free Planning Permission Checker for a 2-minute steer.