Prefab extension cost examples

Question

Is it worth going prefab over traditional bricks for an extension? Looks like prefab might be cheaper, but I’m not sure if there are hidden bits like site prep or connections that push the price up?

Jason · Answer

Prefab, generally quicker to install,  the down side is you don't get the solid construction of bricks and mortar esp with the weather conditions in this country.
Another downside once prefab ordered a lot more trouble to amend or change once construction under way.

Ben · Answer

As others have said it’s sometimes quicker to do this and can be cheaper but also bear in mind. You need to have good access as you may also need a crane to lift in to place. You do lose the flexibility if you want to make alternations and if you did depending what you could lose your building regs and compliance as the building would be approved for that only

Adrian · Answer

I suggest vest to take the ready made bricks .More reliable

Charles · Answer

Prefab (modular) can be cheaper and faster than traditional brickwork, but you still need site prep, foundations, and connections, which can add a lot. Overall, it’s often slightly cheaper or similar in cost, with speed and less mess as main benefits.

Best regards, CB Builders & S

Huseyin · Answer

Prefabrik extension is beta compatible and secure with damp and is faster than brick and is less expensive

Fatjon · Answer

Yes — going prefab for an extension can be worth it, but whether it is worth it depends on a few key factors.

Victor · Answer

Prefab can be worth it for an extension, especially if speed and upfront cost matter. Factory-built units often mean lower labour costs and faster install.

That said, the “cheaper” headline price doesn’t always include:
-Groundworks and foundations
-Service connections (water, electrics, drainage)
-Planning/building control fees
-Access constraints (crane hire, tight sites)
-Finishing to match the existing house

In some cases, once you factor those in, the cost difference narrows. It really comes down to site conditions, spec level, and how well it needs to blend with the existing brickwork. Getting like-for-like quotes (including all prep and connections) is key.

Prefab extension cost examples

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