Fireplaces and Chimney Breasts in London Homes: Keep, Remove or Restore?

In a Victorian terrace, the chimney breast is a brick pier that runs through the full height of the building — from the external chimney stack at roof level, through the first floor, through the ground floor, and (in many properties) down to a hearth foundation at basement or ground level.

The chimney breast itself is typically not a primary structural element (the party walls and external front/rear walls carry the floors and roof). However:

• •**It carries the stack above:** The chimney breast at first floor level carries the weight of the external chimney stack above the roof. If the first-floor chimney breast is removed, the stack above must either be removed or carried by a new beam.

• •**It may be built into the floor structure:** At first floor level, the ceiling and floor joists often bear on or are built into the chimney breast brickwork. If the chimney breast is removed, these joists need to be re-supported.

• •**Previous partial removals create hidden risks:** A very common scenario in London Victorian terraces is a chimney breast that was removed at ground floor level in a previous renovation — but the first-floor chimney breast remains, effectively 'floating' without proper structural support. The joist that spans across the former chimney breast opening may be inadequate or may be carrying more load than intended. This is one of the most frequently identified structural defects in London Victorian properties on RICS Level 3 surveys.

**Before any chimney breast work:** A structural engineer must be consulted before any chimney breast is altered — whether removing, partially removing, or reinstating. The engineer must understand the full picture of what is above and below the area being altered before designing the structural solution.

Chimney breast removal is one of the most common structural alterations in London Victorian terrace renovations — particularly when creating an open-plan ground floor layout.

• **Ground floor chimney breast removal:**
• Removing the ground floor chimney breast creates an unobstructed rear reception room. However:
• •The first-floor chimney breast (above) must be supported by a new structural beam (typically a steel RSJ) installed in the ceiling above the opening. This is designed by the structural engineer.
• •The beam bears on padstones (load-bearing piers) at each side of the former breast
• •The flue and breast above are then carried by the beam

• **Full removal (both floors and external stack):**
• Removing the chimney breast at both ground and first floor levels, and the external stack, creates the most floor area and the cleanest result. However:
• •Both floors require structural beams (one at each floor level)
• •The external chimney stack must be removed before or at the same time
• •Party wall implications: where the stack is on the party wall line, the adjacent property's flue (if they retain their stack) may be affected

**Retained stack with removed breast:** Where the external stack is retained but the breast is removed at one or more floors, the stack above the removal point is carried by a new structural beam. The chimney pots and stack remain on the roof but the flue is effectively terminated below the removal level — the upper flue must be capped and ventilated.

• **Costs for chimney breast removal in London:**
• •Ground floor removal only (+ new steel, decorator finish to new soffit): £3,000–£7,000
• •Both floors (ground and first floor removal + 2 new steels): £6,000–£12,000
• •Complete removal including external stack: add £1,500–£4,000 for stack demolition, roof reinstatement, and party wall work

Building Regulations approval is required for chimney breast removal. Structural calculations are submitted to Building Control.

The reverse trend — reinstating original fireplaces or installing wood-burning stoves — is equally common in London renovation projects, as homeowners recognise the architectural character that fireplaces add to a Victorian interior.

• **Original fireplace reinstatement:**
• Where the original fireplaces have been removed (typically in the 1960s–1980s when gas fires and central heating became standard), reinstatement involves:
• •Opening up the blocked hearth opening (the breast is typically intact beneath the plaster finish)
• •Removing infill plasterboard or brickwork blocking the hearth
• •Repointing or relining the flue (a flue liner or stainless steel flexible liner may be needed to bring the flue to a safe condition for use)
• •Sourcing and installing a period-appropriate grate, surround, and hearth

Cost of reinstating an original fireplace (including flue lining): £1,500–£4,000 per fireplace.

• **Wood-burning stove installation:**
• A wood-burning stove requires:
• •A lined flue from the stove to above the roof: a stainless steel twin-wall liner or flexible liner inserted into an existing chimney. If no chimney exists, a twin-wall flue system is run externally.
• •HETAS registered installer (the Competent Person Scheme for solid fuel appliances — self-certification to Building Control)
• •DEFRA-approved stove (required in London, which is a Smoke Control Area under the Clean Air Act): only DEFRA-approved stoves that burn low-emissions fuels (dry seasoned hardwood, manufactured compressed logs) are permitted
• •Hearth of non-combustible material (minimum 840mm × 840mm for most stoves)

**London Smoke Control Areas:** The whole of Greater London is a Smoke Control Area. Burning wood in an open fireplace is not permitted in a Smoke Control Area. A DEFRA-approved exempt appliance (a wood burner that meets the exempt appliance criteria) can be used to burn authorised fuels and specific types of wood. This is important to check before purchasing a stove — not all stoves are DEFRA-approved for use in London.

Cost of wood-burning stove installation (DEFRA-approved stove, flue liner, hearth, HETAS installation): £2,500–£6,000.