Is it worth internally insulating if external render is blown?

[MissingMyLieIns]

Firstly apologies as I am a bit clueless about this subject. Have been googling and will get some builders in to look at but could do with some impartial advice/guidance first.

We have just moved into a 1930s house. We are intending to get the north facing living rooms and two front bedrooms internally insulated, to make them warmer.

However we think the external render on the upper part of the house is blown and there are signs of damp on the main bedroom bay - possibly due to cement render patching when the windows were last replaced. (Not sure when, maybe 15 years ago)

We weren't intending to re render or replace windows yet, was hoping to hang on a couple more years before we could afford it.

However, is there any point spending money on internally insulating if the external render needs replacing (and therefore the front windows may as well be done now) Am I going to cause myself further damp problems or even structural problems if I wait until next year or the year after?

Any advice would be appreciated!

If you can afford it get the exterior sorted! I just had the pointing done, was a straight forward job, and has made a noticeable improvement to the warmth of the house. A neighbour has just moved in and is paying £8K to sort out the exterior of her house, many bricks are blown, and parts of the pointing seem to have been done with concrete.
I would also be wary of trapping damp by insulating the rooms.
Sure someone more knowledgeable will be along shortly.

Don’t wait. Don’t do any internal work until it’s secure outside. It should be a cavity wall so there should not be damp inside. What did your survey say? There shouldn’t be any need for internal insulation on the walls. Good heating, ventilation and watertight render should be sufficient.

Thanks both, solid walls so no cavity and the rooms are blooming freezing! Sounds like I need to get the render sorted... best check see if I can find a few grand down the back of the sofa....

If you are going to get the external render done, consider external wall insulation if possible - it is pricy but you wouldn't then need to insulate internally. We have solid walls upstairs and the rooms leak heat!

Don't bother doing anything internally before making the exterior water tight.

There's simply no point.

Roof, guttering, external walls and foundation are all more important than what's inside. Sorry.