Damp proofing - what to do?

thunderbird

We have a house built around 1800 which only has a damp proof course in the end wall which was rebuilt some years ago.

We have areas of cold in the front and rear walls and patches where it sounds hollow if you tap the wall. There isn't any marking or mould/smells etc.

Have been ignoring it for years, but as we may possibly move in the next couple of years we thought we really should have it looked at.

I have had one person round so far who spent a few minutes sticking a meter into various parts of the walls before telling me that they are very wet and need a damp proof course. He offered two options -
1. remove skirting/radiators and plaster to height of 1m, insert damp proofing and then return to replaster etc. we can repaint after several more weeks. He said this will take a few months start to finish
2. inject the damp proof course externally. Will be about a quarter of the cost of option 1.

option 2 obviously looks the more attractive, but is it worth doing?

I am going to get a few more people round for quotes, but would appreciate any advice/guidance.

thanks

Canucklehead

Hi: before you go down either route have a read here.

HTH

Canucklehead

thunderbird

Thanks
I don't think there are really any other steps we can take to minimise the damp. House is well ventilated, guttering is fine, at the back we have gravel and at the front is the pavement so nothing we can do with that.

Just after any advice on whether it is ok to go with option 2 and also what potential buyers will be wanting to see.