1×40 + 1×20 with decking container as an annexe: 44.5 m²
40 + 20 ft with decking. A couple with a home office or guest room, on a tight budget.
The space standard applies only where your council has adopted it in its Local Plan. Check with the council and an architect before you choose a plan.
How much it costs
Between £59,228 and £80,131, VAT included and a ±15% margin. Balanced finish, one-trip containers, residential plot with water, power and drainage. The land is not included.
Container prices from UK depots (2025–2026) and building work with UK factors on the Contentar engine, checked in November 2026. VAT at 20%. Excludes land, heat pump, solar panels, warranty, CIL and stamp duty.
It includes 6% more than the same area in simple containers. One 2.2 m end/side link and a flashing: ~+5–7% (deck and pergola extra).
Build complexity: medium.
For and against
For
- The 20 ft to the west shades the deck and closes a south patio without a third container.
- A 13 m² bedroom 2 away from the living area: guests, office or a teenager.
- A glazed gallery to the south opening straight onto the deck.
Against
- Narrow living room and kitchen (2.20 m) and a 0.90 m corridor; bedroom 1 only 6.9 m².
- 44.5 m² built: above the 37 m² for 1 bed, 1 person; below the 50 m² for 1 bed, 2 people in the space standard.
Sun orientation
40 ft to the north with openings to the south onto the deck; the 20 ft to the west cuts the afternoon sun.
Adjust the finish, used or new container and the land, and see the cost line by line.
Work out my cost UK guide · join the waiting listSee this plan in 3D on Contentar
Other plans
- 1×20 container as an annexe: 14.8 m²Annex in a 20 ft container · £30,698–£41,532
- 1×40 container as an annexe: 29.7 m²Studio in a 40 ft container · £42,063–£56,909
- Container home 2×40: 1 bedroom, 59.4 m²1 bedroom · two 40 ft side by side · £78,046–£105,591
- Container home 3×40: 2 bedrooms, 89.2 m²2 bedrooms · three 40 ft side by side · £110,928–£150,078
- Container home 4×40: 3 bedrooms, 118.9 m²3 bedrooms · four 40 ft side by side · £144,913–£196,060
- Container home 2×40 + 1×20 L-shaped: 2 bedrooms, 74.2 m²L-shaped 2 bedrooms with a patio · £92,681–£125,390
- Container home 4×40 H-shaped: 3 bedrooms, 118.9 m²H-shaped 3 bedrooms with two patios · £147,412–£199,440
- Container home 3×40 duplex: 2 bedrooms, 89.2 m²2-bedroom duplex, one 40 on top · £113,847–£154,027
- 1×40 + 1×20 with decking container as an annexe: 44.5 m²40 + 20 ft with decking · £59,228–£80,131
- 2×20 L-shaped container as an annexe: 29.5 m²Two 20 ft in an L · £50,709–£68,607
- 2×40 cantilevered container as an annexe: 59.4 m²Stacked cantilever with a terrace · £85,014–£115,019