knob and tube in insulation
I am in the process of purchasing a 1927 bungalow in need of knob and tube replacement. I've got a pretty extensive understanding of the knob and tube replacement at this point but would like to get a better sense of what this means for my walls.
The home has knob and tube running through an insulated attic crawl space feeding down into 3/4 of the main floor (wiring in a kitchen and bathroom were updated during previous remodels). It has now become apparent cellulose insulation was blown into the knob and tube on the main floor at some point. All walls in impacted area are original lath and plaster.
I have received bids to remove all knob and tube/rewire and update mic. electrical and plan on doing so. But, I am unclear on how invasive this will be to the plaster and what sort of repairs and costs I'm looking at once everything on the electrical end is wrapped up. Contractor has said that while some clients will pay extra to fish and avoid getting into the walls it will be far less expensive for me to let them cut in and then repair the walls.
I'm already looking at swallowing the cost of this knob and tube job (or at least a large part of it - seller is offering some credit but not much) and want to be sure I'm not getting myself into real trouble - both financially and in terms of retaining the aesthetic integrity of the home.
Any and all info/suggestions/thoughts on what this job means looking through the wall damage filter would be very helpful. Thank you!