Ballpark figure for re-roofing 1830's butterfly roof

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Wiltshire
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Hi,
I know asking this is like asking how long is a piece of string but I'm hoping someone on here could offer some useful guidance.

I am in the process of buying a late Georgian terrace house (built approx 1836). I have had a full structural survey performed but the house is slightly problematic in that there is no exterior vantage point from which it is possible to view the state of the roof. What's known is it's a butterfly roof, probably with slates and that in one side roof timbers are showing significant signs of rot. From interior examination the surveyor has determined this to be down to lack of ventilation, in both sides of the roof, causing significant condensation.

His recommendation is that the left hand roof needs to be completely stripped, the rotten roof timbers replaced, new membrane put on, proper ventilation added and then the slates put back on. Obviously this is dependent upon the slates being in a good enough condition. In addition he has suggested that the same be done to the right hand side, to address the ventilation issues and before that starts to rot too. So essentially a complete re-roofing. He has suggested a figure of £15k.

My question is, does that seem too low, too high, or about right? And if new slates were required how much additional cost would that add?

Like I said I know it's "how long is a piece of string" but I need something to go back to the seller with and people seem reluctant to quote due to the limited exterior access for a good look see!

The footprint of the building is about 5m * 7m. Roof is very shallow pitched, in keeping with Georgian terrace houses. Obviously will need fully scaffolding,

Steve
 
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the house is slightly problematic in that there is no exterior vantage point from which it is possible to view the state of the roof
Beg, borrow, or steal a drone!
There are companies offering drone surveys, but the costs can be (sky) high :)
 
I've DMd you another forum where you might get half-decent answers.
 
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