Chimney Stack Removal

27 Jan 2013
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United Kingdom
Dear all,

I’m planning a loft conversion and would like to take the opportunity to remove the chimney stack on the roof, together with the chimney breast in the loft (and potentially carry on to the first and ground floors).

The property is a mid terrace two-bed house, the width (from one party wall to the next) is 5 m, and the depth (back to front) is about 8 m. There are two breasts that converge into one at loft level and then carry on to the roof as a single stack. The chimney stack is right in the middle. The property is not in a conservation area.

If you are familiar with this topic, could you please give some tips:

- Is this project technically feasible? The removal of the stack can have implications on the stability of the stack of the adjoining property? I’m thinking about the part of the stack above the roof;

- Is a party wall agreement required? I’ve gone through the act and this piece of work doesn’t seem to fall into any category;

- Is planning permission required? My understanding is that, outside conservation areas, this work falls under permitted development .

Any help is much appreciated.

Kind regards,

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Why not you use the search button to read up on the massive amount of previous info and pics contained in this forum?

Read esp. the party wall info. and c/breasts.
If you take down your half of the chimney above roof level, how will you deal with the neighbour's half?

Not only will the chimney be more liable to damage in high winds on account of its slenderness, but how will you deal with the sooty stains which will show on the chimney?

Removal of the chimney /chimney breasts is a Party Wall Act matter.
Dear All,

I’ve just spoken to the building control officer regarding removing one half of the chimney stack.

For the removal to be feasible the following applies:

- The flues of adjacent properties need to be separated by a wall;

- The remaining chimney should be in good repair (otherwise repointing is recommended) and satisfy the slenderness ratio as specified in Diagram 20 of the current Building Regulations Part A. If the minimum ratio is not met, then a more detailed assessment should be carried out by a structural engineer;

- The side of the remaining chimney that is exposed by the demolition should be covered for “aesthetic” purposes to hide the soot stains: normally this is done with cement render or similar;

- The work falls under the Party Wall Act.

- If the property is not in a conservation area, the work falls under Permitted Development.

I hope this will help extending the knowledge on this often debated subject.

Kind regards,

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the option i took was leave stack on roof but installed an A frame flitched beam seem to recall 150mm x 10mm steel plate between 150x50mm timber and a 8mm rod between the ends at joist level
Something I've considered doing in my house and due to the sheer case of time and energy required I decided not to. Think about what you're really gaining and losing from the process. Perhaps 2m2 per floor gained if that, worth it ?

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