Cutting A Section Out Of A Skirting Board Which Is In Situ

[needawin]

Need to cut a length out of a skirting board in situ to fit in an artificial fireplace.
How can I go about it without marking the wall please.

[Buenchico]

Basic technique here:

[Buenchico]

. . . or you could hire a multi-cutter, such as this one
https://www.hirebase.uk/multi-tool
to make the job a bit easier:

[Old_Geezer]

Carefully.

[The Builder]

Yes, carefully's the only way.
A fine-toothed saw is best. Something like a tenon saw if you have one.
https://www.screwfix.com/c/tools/tenon-saws/cat9790019

In Chris's first video, it shows the chap jamming a steel chisel behind the board first. That's what I usually do. It lifts the board just slightly away from the wall, to allow the saw to get right through.

Ram the chisel behind the piece of board that is due to come off. That way, damaging the wall with the chisel isn't so important

[mjwman]

An alternative is to chisel down the line with a very sharp chisel and keep going deeper. Not as neat but it would do it!