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18×6 Apex Shed – Single Door, Windowless

Original price was: £1,629.00.Current price is: £1,547.55.

Featuring an EXTRA higher door and apex roofline, this shed is made of thick tongue and grooved wood that’s durable and weather-resistant. A wooden floor, roofing felt, and fixings are included.

Easy to adapt: You can hinge the door either way during assembly!

Enhanced by a HAZELNUT GOLD preservative, this will extend its longevity and provide additional protection.


Hand-Built to Order — Estimated Delivery 3–6 Weeks

Each order is made specifically for you in our workshop. Lead times vary by model and postcode. We’ll contact you to confirm your delivery details.

15-Year Timber Guarantee — Included Free

All Fortress buildings come with a 15-year timber guarantee as standard, giving you long-term protection and complete peace of mind.

Rated by Real Customers

5.0
5.0 out of 5 stars (based on 74 reviews)

Optional Home Assembly

Don’t fancy DIY? Our experienced team can assemble your building for you. VIEW PRICES

Flexible, interest-free payments available with  and

Why buy the RAINBOW Apex Shed?

Generous Headroom

In all of our sheds, the doors are higher and the ridges are higher, which makes accessing and exiting the building easier and more comfortable.

Wall Cladding

In addition to the tongue and groove construction, sheds are clad in a unique shiplap cladding constructed of 12mm thick tongue-and-groove timber.

Premium Felt

Standard on all sheds is high performance polyester mineral felt. This type of barrier provides reliable weatherproof protection with less wear and tear.

Durable Framework

The slow-grown European timber we use is 34 x 44mm thick, providing you with the greatest support your shed needs. All four corners are rounded for a smoother finish.

Wood Preservative

Our sheds are prepared for preservation with our unique 365-day Rainbow-Skin. A 48-hour drying period is followed by applying this pre-treatment to the wood.

Easy Assembly

With the help of the instructions provided, sheds are one of the easiest to assemble. The foundation must be firm & level before construction can begin!

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18x6 Apex Shed - Double Door, Windowless

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Original price was: £1,699.00.Current price is: £1,614.05.
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Dimensions Metric (mm) Imperial (inches)
Width (excluding roof) 1799mm 70.82″
Depth (excluding roof) 5380mm 211.81″
Width (including roof) 1909mm 75.15″
Depth (including roof) 5430mm 213.77″
Eaves Height (inc floor) 1852mm 72.91″
Eaves Height (internal) 1796mm 70.70″
Ridge Height (internal) 2101mm 82.71″
Ridge Height (inc floor) 2207mm 86.88″
Door Opening Size (w x h) 767mm x 1728mm 30.19″ x 68.03″
Door Height 1780mm 70.07″
Door Width 784mm 30.86″
Width (internal) 1687mm 66.41″
Depth (internal) 5270mm 207.48″
Minimum Base Width 1775mm 69.88″
Minimum Base Depth 5358mm 210.94″
Specifications Metric Imperial
Cladding Material Shiplap Cladding Thickness 12mm 0.47″
Framing Style Standard Framing Size 34mm x 44mm 1.33″ x 1.73″
Roof Material Tongue & Groove Board Roof Thickness 12mm 0.47″
Floor Material Tongue & Groove Board Floor Thickness 12mm 0.47″
Door Style Single Door Z Braced Door Material Tongue & Groove Board
Window Style N/A Window Size N/A N/A
Glazing Material N/A Glazing Thickness N/A N/A
Roof Covering Polyester Mineral Felt Treatment Hazelnut Gold (Water Based)
Locking System Lock and Key + 2 Turn Buttons Material European Softwoods

ZONE 1 POSTCODES FREE

(Mainland only) AL, B, BA, BB, BD, BH, BL, BN, BR, BS, CA, CB, CF, CH, CM, CO, CR, CV, CW, DA, DE, DG, DH, DL, DN, DT, DY, E, EC, EH, EN, FY, G, GL, GU, HA, HD, HG, HP, HR, HU, HX, IG, IP, KA, KT, L, LD, LE, LL, LN, LS, LU, M, N, NE, NG, NN, NP, NR, NW, OL, OX, PE, PO*, PR, RG, RH, RM, S, SE, SG, SK, SL, SM, SN, SO, SP, SR, SS, ST, SW, SY, TA, TD, TF, TN, TS, TW, UB, W, WA, WC, WD, WF, WN, WR, WS, WV, YO.

ZONE 2 POSTCODES £25.00 (Mainland only) CT, EX, FK, KY PA, SA

ZONE 3 POSTCODES £55.00 (Mainland only) AB, DD, PH, PL, TR, TQ

NO DELIVERIES IV, KW, PO (ISLE OF WIGHT) If your postcode is not currently listed within the above delivery zone but you are interested in finding out the availability and / or price of a delivery of one of our garden buildings to your home please contact our customer service department on 0333 577 3308 for information.

During the order checkout process, you'll have the opportunity to choose your preferred delivery week from an available weeks calendar. You have the flexibility to select dates further into the future if needed. The week you select for delivery is the one Rainbow will strive to deliver in.

 

HOW DOES DELIVERY WORK?

Before your order is ready to be dispatched, we will contact you on the phone number/email you provided and arrange a suitable delivery date with you closer to the time. Rainbow will aim for the week you select as your preferred delivery week.

As your order will arrive on pallets, we are required to use HGV transport. Please advise ASAP if your property is not suitable for delivery by a heavy goods vehicle as we will need to inform the delivery company and make special arrangements for a smaller vehicle.

All deliveries are made to the kerbside only, unless otherwise agreed. In order for the driver to deliver to you, you will need to provide an appropriate area as close as possible to your kerbside.

Generally, the product is delivered packaged, on a standard pallet size of 1.2m x 1.2m. You are responsible for disposing of this pallet at your discretion.

It is not the driver's responsibility to unload the pallet of panels, it is the customer's responsibility to move delivered goods beyond the kerbside.

Well made

July 2, 2026

Lovely well made shed … all as described

Avatar for Mark
Mark

Really impressed

April 4, 2026

Just had my shed delivered and I’m really impressed. Everything arrived on time and well packaged. I built it myself and had no issues at all — the instructions were clear and all the parts fitted together properly. The quality of the materials is excellent and it feels very solid and well made. You can tell it’s built to last. Overall, very happy with the purchase and would definitely recommend.

Avatar for Amanda Clarkson
Amanda Clarkson

Arrived on time

November 4, 2025

Our new shed arrived on time and was put together in quick efficiency. Would well recommend this company

Avatar for Chrissy and Alan
Chrissy and Alan

Good price

October 3, 2025

Great service – ordering simple, good price, delivery spot on, fitting perfect! Top quality shed, modular design really good, as could specify exactly where door/windows would be.

Avatar for Clive Duerden
Clive Duerden

Love it

September 25, 2025

Wonderful dog kennel, Marley loves it.

Avatar for Fran. B
Fran. B

Write a Review

Rainbow's 15-year guarantee covers general timber rot and decay - it does not cover timber splits or warping which may occur naturally over time.

To maintain the validity of this guarantee the product must be assembled strictly in compliance with the instructions supplied, treated annually with an appropriate high-quality preservative and all glazing units must be sealed with silicone or another watertight sealant, inside and outside.

More information
18x6 Apex Shed - Single Door, Windowless
18×6 Apex Shed – Single Door, Windowless