Heavy Duty 15mm Garden Sheds

Our heavy-duty 15mm garden sheds are built with:

• 15mm tongue-and-groove wall cladding
• 15mm tongue-and-groove flooring
• 12–13mm tongue-and-groove roof

Apex and pent sheds are the same price.

Visit Our Shed Factory – St Helens

Our St Helens factory is where every Harts Timber shed is built.

Visit us to see the sheds in person and get expert advice from our sales team.

15mm garden sheds price

Garden Sheds

4 x 4 ( 1.2m x 1.2m ) £519

5 x 4 ( 1.5m x 1.2m ) £539

5 x 5 ( 1.5m x 1.5m ) £559

6 x 4 ( 1.8m x 1.2m ) £599

6 x 5 ( 1.8m x 1.5m ) £629

6 x 6 ( 1.8m x 1.8m ) £649

7 x 4 ( 2.1m x 1.2m ) £629

7 x 5 ( 2.1m x 1.5m ) £649

7 x 6 ( 2.1m x 1.8m ) £689

7 x 7 ( 2.1m x 2.1m ) £820

8 x 4 ( 2.4m x 1.2m ) £719

8 x 5 ( 2.4m x 1.5m ) £729

8 x 6 ( 2.4m x 1.8m ) £769

8 x 7 ( 2.4m x 2.1m ) £950

8 x 8 ( 2.4m x 2.4m ) £1,020

9 x 4 ( 2.7m x 1.2m ) £759

9 x 5 ( 2.7m x 1.5m ) £779

9 x 6 ( 2.7m x 1.8m ) £799

9 x 7 ( 2.7m x 2.1m ) £1,050

9 x 8 ( 2.7m x 2.4m ) £1,090

10 x 4 ( 3.0m x 1.2m ) £869

10 x 5 ( 3.0m x 1.5m ) £889

10 x 6 ( 3.0m x 1.8m ) £909

10 x 7 ( 3.0m x 2.1m ) £1,090

10 x 8 ( 3.0m x 2.4m ) £1,120

12 x 4 ( 3.6m x 1.2m ) £999

12 x 5 ( 3.6m x 1.5m ) £1,019

12 x 6 ( 3.6m x 1.8m ) £1,039

12 x 7 ( 3.6m x 2.1m ) £1,310

12 x 8 ( 3.6m x 2.4m ) £1,460

Garden Shed Extras

Internal Panel: Please call for pricing and availability.
Extra Single Door (15mm): £30
Wider Single Door (15mm): £10
Double Doors (15mm): £50
Stable Door: £20
Extra Window: £10 – only applicable to sheds with more than two windows.

Prices for 12-13mm sheds

Pressure-Treated Timber Bearers

Shed Bearers

4 x 4 ( 1.2m x 1.2m ) £15

5 x 4 ( 1.5m x 1.2m ) £19

5 x 5 ( 1.5m x 1.5m ) £24

6 x 4 ( 1.8m x 1.2m ) £23

6 x 5 ( 1.8m x 1.5m ) £29

6 x 6 ( 1.8m x 1.8m ) £35

7 x 4 ( 2.1m x 1.2m ) £27

7 x 5 ( 2.1m x 1.5m ) £34

7 x 6 ( 2.1m x 1.8m ) £40

7 x 7 ( 2.1m x 2.1m ) £47

8 x 4 ( 2.4m x 1.2m ) £31

8 x 5 ( 2.4m x 1.5m ) £38

8 x 6 ( 2.4m x 1.8m ) £46

8 x 7 ( 2.4m x 2.1m ) £54

8 x 8 ( 2.4m x 2.4m ) £62

9 x 4 ( 2.7m x 1.2m ) £35

9 x 5 ( 2.7m x 1.5m ) £43

9 x 6 ( 2.7m x 1.8m ) £52

9 x 7 ( 2.7m x 2.1m ) £61

9 x 8 ( 2.7m x 2.4m ) £69

10 x 4 ( 3.0m x 1.2m ) £38

10 x 5 ( 3.0m x 1.5m ) £48

10 x 6 ( 3.0m x 1.8m ) £58

10 x 7 ( 3.0m x 2.1m ) £67

10 x 8 ( 3.0m x 2.4m ) £77

12 x 4 ( 3.6m x 1.2m ) £46

12 x 5 ( 3.6m x 1.5m ) £58

12 x 6 ( 3.6m x 1.8m ) £69

12 x 7 ( 3.6m x 2.1m ) £81

12 x 8 ( 3.6m x 2.4m ) £92

Optional: Pressure‑Treated Shed Bearers

Recommended for all wooden sheds.
Pressure-treated timber bearers are available for every shed size and help protect the shed floor and lower timbers.
They raise the shed off the ground to improve airflow underneath, helping to reduce moisture and extend the life of the shed.

15mm Garden Shed Construction

Our 15mm garden sheds are built for extra strength and durability.

• 15mm tongue-and-groove wall cladding
• 15mm tongue-and-groove flooring
• 12–13mm tongue-and-groove roof
• Solid timber framing
• Ledged and braced doors
• Anti-rip polyester mineral roofing felt
• Protective basecoat applied before delivery

Contact Harts Timber Sheds

Factory & Showroom

Harts Timber Sheds
181 Broad Oak Road
St Helens
Merseyside
WA9 2AQ

Factory entrance:
Moorfoot Road Industrial Estate
St Helens
WA9 2DY

Phone: 01744 730004

Opening Times

Monday–Thursday: 8:00–17:00
Friday: 8:00–16:00
Saturday: 10:00–14:00
Sunday: Closed

Free Delivery & Assembly for 15mm Garden Sheds

Free delivery and professional assembly are included within our standard delivery area.
Your shed is delivered and assembled on the same day by our own experienced team.