Solid wall insulation

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Yorkshire
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We're planning on redecorating one of the upstairs bedroom and putting in solid wall insulation. It's a fairly large corner bedroom, with two walls (South and West) braving the elements, the North wall adjoining the neighbours and the East being an internal stud wall.

The house is built in the early 18th century and the problem with this particular bedroom is that is gets cold. Whilst the other room with external walls are nice and toastly, unless the heat is constantly on, it gets cold quickly. The room is double glazed with any drafts sealed, and the loft has more than the recommended 300mm insulation.

The possible reasons for the room being cold:

a. It has two external facing walls
b. One wall had a fireplace in the past which has been removed and plastered over. It could still be a source of heat loss
c. We very much doubt the neighbour has their heating on, so there there is probably heat loss rather than heat gain

As part of the redecoration, we're going to reintroduce the fireplace with a wood burner, and at the same would like to make the room more energy efficient by adding solid wall insulation.

The picture below shows the size of the wall. The measurement is 17" including plaster. Rather that insulating on top, we're thinking of getting the plaster removed to the wall, and then applying 100mm of insulating plasterboard

Its not a job that we would be doing personally, and we want to ensure that we ask the right questions when getting quotes. We'd want to go down the route of batons, vapour barrier and then the insulation. What concerns us is that its an old house and we don't want to introduce any damp problems. Does anyone have first hand experience of solid wall insulation in an old propertly and what is the process to ensure damp is not introduced?

At the moment we're planning on doing solid wall insulation to three of the walls, including the one facing the neighbours. Whether or not including the neighbour facing wall is false economy, we're not too sure on.

Thanks

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Any idea how thick the plastering is at the moment?

100mm of insulation is 4" in old money. This will reduce the room size by 8" between opposing walls unless the plaster is very thick, but you would still be losing a great deal of space if you batten it then add 4" of plasterboard.
 
Good point.

I know there's at least 3cm of plaster as my youngest decided to swing on the curtain and brought the fixings incuding part of the plaster down.

I'm happy to go with less. It seems around the 50 - 60mm mark is common.
 

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