How does Shed Deal Hub calculate £/m²?

Internal floor area in square metres. For imperial sizes, feet × feet × 0.092903, rounded to the nearest penny of area. A 6x4 is 2.23m², a 7x5 is 3.25m², an 8x6 is 4.46m², a 10x8 is 7.43m² and a 12x8 is 8.92m². £/m² is the current price divided by that area, shown only when the area is at least 0.8m².

Is overlap cheaper than shiplap per square metre?

Yes. In 2026 a dip-treated overlap shed typically lands at £85–£125/m², dip-treated shiplap or tongue-and-groove at £110–£160/m², and pressure-treated tanalised shiplap at £135–£195/m².

Why is a 6x4 dearer per square metre than an 8x6?

The door, frame, ironmongery and delivery cost almost the same on both, and the 6x4 has only half the floor (2.23m² against 4.46m²). The rate is usually 18–25% higher on the smaller shed.

Guides · 2026-10-26

UK Shed Prices Per m² (2026): Overlap vs Shiplap vs Pressure-Treated

2026 UK benchmark prices per square metre for dip-treated overlap, dip-treated shiplap, and pressure-treated tanalised sheds from 6x4 to 12x8.

A 6x4 overlap shed at £259 and an 8x6 pressure-treated shiplap shed at £439 are not comparable until you turn both into £/m². Shed Deal Hub uses internal floor area: feet × feet × 0.092903. A 6x4 is 2.23m², so £259 is about £116/m². An 8x6 is 4.46m², so £439 is about £98/m².

The bands below are 2026 UK retail ranges for mainstream dip-treated and pressure-treated apex or pent sheds, excluding delivery surcharges, bases and installation. Clearance deals on this site should land inside or under the band for their cladding. A price far under the band usually means OSB boards, no floor, or a short dip treatment.

2026 benchmark £/m² by footprint and cladding

The band is a rate. The cash price still rises with the footprint. An 8x6 at £110/m² is about £490. A 6x4 at the same rate is about £245, but small sheds rarely hit the bottom of the band because the door, frame and delivery are spread over 2.23m².

Typical UK inc-VAT shed price per square metre of internal floor, 2026.
Footprint	Floor area	Dip-treated overlap	Dip-treated shiplap / T&G	Pressure-treated tanalised shiplap
6x4	2.23m²	£85–£125/m²	£110–£160/m²	£135–£195/m²
7x5	3.25m²	£85–£125/m²	£110–£160/m²	£135–£195/m²
8x6	4.46m²	£85–£125/m²	£110–£160/m²	£135–£195/m²
10x8	7.43m²	£85–£125/m²	£110–£160/m²	£135–£195/m²
12x8	8.92m²	£85–£125/m²	£110–£160/m²	£135–£195/m²

Why 8x6 is the UK value size

Buyers consistently pay 18–25% less per square metre for an 8x6 than for a 6x4 in the same cladding. The 8x6 (2.4m × 1.8m) is the smallest common shed you can stand a bicycle beside a shelf in. Below that, you are buying a store cupboard with a door. Above it, 10x8 and 12x8 keep a similar rate but need a more serious base and a harder look at the 2.5m boundary rule.

OSB versus tongue-and-groove

Before you take a clearance price, look at the floor and the roof. Oriented strand board (OSB) is a sheet material. It is flat, cheap, and it hates standing water. Solid tongue-and-groove matchboard costs more and can be replaced board by board. A '40% off' shed with an OSB floor and an OSB roof is not the same building as a pressure-treated shiplap shed with a 19mm T&G floor, even when the £/m² looks better.

Also check the bearers. A floor that sits on the ground will rot whatever the cladding claim says. The building wants to be on a base, with air under the joists.

Dip-treated versus tanalised

Dip treatment is a bath of preservative. It colours the timber and protects the surface. It is not a 15-year promise. Plan to coat a dip-treated shed with Cuprinol, Ronseal or Barrettine in the first dry spell, and again each year.

Pressure-treated (tanalised) timber has preservative forced through the section. Makers commonly warrant that timber against rot for 10–20 years. You can still stain it for colour, but you are not in an annual race against bare sapwood. That is why pressure-treated shiplap sits at £135–£195/m² rather than the overlap band.

Questions buyers ask

How does Shed Deal Hub calculate £/m²?: Internal floor area in square metres. For imperial sizes, feet × feet × 0.092903, rounded to the nearest penny of area. A 6x4 is 2.23m², a 7x5 is 3.25m², an 8x6 is 4.46m², a 10x8 is 7.43m² and a 12x8 is 8.92m². £/m² is the current price divided by that area, shown only when the area is at least 0.8m².
Is overlap cheaper than shiplap per square metre?: Yes. In 2026 a dip-treated overlap shed typically lands at £85–£125/m², dip-treated shiplap or tongue-and-groove at £110–£160/m², and pressure-treated tanalised shiplap at £135–£195/m².
Why is a 6x4 dearer per square metre than an 8x6?: The door, frame, ironmongery and delivery cost almost the same on both, and the 6x4 has only half the floor (2.23m² against 4.46m²). The rate is usually 18–25% higher on the smaller shed.