Old School House in France

[zbc]

I've posted a few times on this on other threads and once or twice quite a while ago in the early days of the project but we are now almost two years in to a project to renovate a school house in our village in France. I thought it might interest a few and I'm sure that you all will be a great source of advice. Originally built in the 1890s, it's in Moselle it hasn't been used as a school for almost 20 years. We started conversations to buy it in 2021 and bought it in 2023. It took about a year to get planning permission and now we are making slow progress to renovate it. It'll be about 200m2 in the end with four bedrooms but sadly no garage yet although space for at least one.

[zbc]

This is what it looks like at the moment upstairs. The reason I started the thread today is that I have my first real question. So far we've had a variety of great builders doing some awesome work at I thought reasonable rates but I've just had a quote for flooring and decorating that seems really crazy. It's a big space and has a lot of high ceilings but 400 Euros a square metre is too much for me so I'll do most of it myself. The one bit I've never done before and seems the most shocking is to put down OSB on this floor to create a level surface for the flooring proper. I looked at OSB and locally it's about 12 Euro/m2 and we have about 100 m2 to do. We've been quoted nearly 20k. Do you think I need to remove the existing flooring before laying the OSB and how hard a job is it to do it myself and get it level?

[Magooagain]

What does the estimate (Devi) actually say?

[foccer]

you dont need level, you just need flat.

When i did the loft conversion on my gaff out there, i just used the thin insulation sheets under the chip board to help with sound deadening.

[smifffymoto2]

Why not lay a lightweight chape?