How Much Does Chimney Breast Removal Cost in 2026?

Removing a chimney breast frees up valuable floor space in bedrooms and living rooms. It is one of the most common structural alterations in UK homes. Costs vary depending on whether you remove one floor or the entire stack.

Typical UK range:£1,500 – £6,000

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Cost Breakdown by Tier

Single Room£1,500 – £2,500

Remove chimney breast in one room, support the stack above with a gallows bracket and RSJ.

Full Internal£2,500 – £4,500

Remove chimney breast on all floors. Support the remaining stack at roof level.

Complete Removal£4,500 – £6,000+

Remove entire chimney stack including above the roofline. Roof and tile making good included.

Factors That Affect the Cost

Number of floors affected
Whether the chimney stack remains
Party wall agreement (shared chimneys)
Structural support required (RSJ, gallows bracket)
Making good (plastering, flooring)

Regional Price Variations

Chimney removal costs are 15–20% higher in London. Party wall surveyor fees add £700–£1,500 in terraced or semi-detached properties.

Frequently Asked Questions

Do I need building regulations for chimney removal?

Yes. Chimney breast removal is structural work and requires Building Regulations approval. You will also need a structural engineer's calculations for the supporting steelwork.

Do I need a party wall agreement?

If the chimney is shared with a neighbour (terraced or semi-detached), you need a Party Wall Agreement under the Party Wall Act 1996. This typically costs £700–£1,500 per neighbour.

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