DH and I are now fully involved in the process of renovating our Victorian terraced house and we have to think again about what we do with the foundations. Who would have thought that a few months ago I'd have known nothing about this! A lot of reading, Google searches and a touch of PigletJohn sage advice and I'm now the project manager. Hopefully this thread isn't gobbledegook to everyone who reads it! The front of our house is the typical suspended wooden floor, with 1 air brick at the front and non at the rear, whilst the entire rear part of the house, which is currently the kitchen and bathroom/toilet is on a poorly laid concrete floor, noticeable by how bloomin' cold it is underfoot! We're extending into the side infill and we had planned for this to have a properly done, insulated, compliant concrete foundation. We had also planned to break up the current rear concrete foundation and do this properly. We also would install 1 more air brick at the front of the house and run ducts to 2 periscope air bricks at the rear to keep the air moving under the house, to prevent damp occurring. So far so good. However today, we've been considering the option of removing all of the original suspended floor joists in the front of the house and making the foundation of the entire house concrete, using the broken up old extension foundation as part of this. This would have the benefits of making the installation and use of underfloor heating more efficient; saving money on skips; reducing the problems which can sometimes be associated with vibrating washers and dryers and removing the ability of rodents to ingress. However, having spent a long time researching the breathability of Victorian terraced houses, hence the proposed ducts and periscope air bricks, I'm concerned that with a concrete foundation throughout we may cause ourselves future problems with damp, particularly with this being pushed up the walls of the house, as moisture will no longer be able to be moved through air in the subfloor as this will be a solid concrete block. DH says he just doesn't know. I haven't been able to find a definitive answer as to the best way to proceed, hence I wanted to see if anyone might have had any relevant experience or may have a more informed opinion. Has anyone replaced the entire floor in a Victorian terraced house and if so, what did you do to mitigate against damp problems occurring? Would installing a suspended floor throughout the entire rear and side infill extension of the house, thereby making it all suspended be a better idea, thereby maintaining breathability? My primary concern with doing this would of course be the expense. I've looked at the option of using a limecrete foundation, but given that we'll be installing an engineered wood floor in the house, the moisture moving through this wouldn't be able to dissipate into the house. The other option would of course be to proceed with our original plan, although that would pose issues with regard to the different warm up times of the ufh in the concrete and suspended areas and an increased labour cost to install this in the suspended floor area. Thanks folks!