Extending a Marble Fireplace to Accommodate a new gas fire

We want to replace our gas fire but the opening in our marble fireplace is 470mm wide whilst the gas fire we want to replace it with is 498mm wide.

Is it possible to alter the marble opening to accommodate the new gas fire as the fireplace is only 5 yrs old  and I really like it and would like to keep it?
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  • FreeBear
    FreeBear Posts: 17,858 Forumite
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    Is the opening behind the fireplace wide enough ?
    Marble is a relatively soft stone, so it is possible to cut ~15mm off each side to accommodate a new fire. It is best cut with a wet diamond saw, but at a push, can be cut dry. However, there is a risk that it might crack as the marble is being cut.
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  • Leodogger
    Leodogger Posts: 1,328 Forumite
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    FreeBear said:
    Is the opening behind the fireplace wide enough ?
    Marble is a relatively soft stone, so it is possible to cut ~15mm off each side to accommodate a new fire. It is best cut with a wet diamond saw, but at a push, can be cut dry. However, there is a risk that it might crack as the marble is being cut.
    To be honest I am not sure, is it possible to take out the existing fire and back plate (by a gas fire fitter presumably) to find out ?
  • stuart45
    stuart45 Posts: 4,688 Forumite
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    Have you got a photo?
  • Leodogger
    Leodogger Posts: 1,328 Forumite
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    stuart45 said:
    Have you got a photo?
    Yes, attached.
  • Slinky
    Slinky Posts: 10,890 Forumite
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    Is that not portland stone?
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  • stuart45
    stuart45 Posts: 4,688 Forumite
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    I'm pretty sure that it could be done.
  • Leodogger
    Leodogger Posts: 1,328 Forumite
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    edited 17 July 2022 at 6:16PM
    Slinky said:
    Is that not portland stone?
    To be honest I am not sure, it has a shiny finish and a marbled effect if that helps.   It wasn't particularly expensive from what I can remember, costed about £550-600 about 5 yrs ago from what I can remember.
  • Leodogger
    Leodogger Posts: 1,328 Forumite
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    Maybe I should just get a gas fire fitter in then to give me a quote.
  • noitsnotme
    noitsnotme Posts: 1,238 Forumite
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    It’s probably cast marble, basically marble powder mixed with resin and cast in a mold.
  • Leodogger
    Leodogger Posts: 1,328 Forumite
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    It’s probably cast marble, basically marble powder mixed with resin and cast in a mold.
    Would that make it more difficult to cut?
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