My house was totalled by fire, but the slab remains intact. The house was torn down and I'm now in the process of selling the lot with the slab on it. It is my understanding that the fire will have to be disclosed in any future sale. Can anyone offer me insight into how the fire will affect the future value of a home built on the slab? I've a couple of potential buyers concerned about this issue.

Any prospective buyer should have an engineering evaluation performed. They may ask you to share or cover the costs considering the history.

How much would it cost to remove the slab and just sell the lot???

Lots of plumbing lines come up through a slab and the structural integrity of the concrete could have been compromised.

If the slab is gone you're just selling a lot; fire becomes immaterial unless someone asks why there's no house there and you just say it burned.

Unless the new house is the exact same floor plan as the existing house, the slab will be useless. There are thickened footers in the slab designed to be under interior load bearing walls. The new house would have to have the slab cut out in areas and new footers poured based on the new load bearing walls. By the time you add selective demo cost to move footers and pipes and pouring concrete back, it's not worth it. Plus if the fire was hot enough it will cause the concrete to spall and lose it's strength. An engineer would have to take core samples and have them tested to see if the slab was structurally sound. Your best bet is to tear the slab out. Just some advice from a former project manager.

One of the potential buyers for sure wants to build the same floor plan. The house is in a subdivision and the contractor indicated the slab "seemed" fine to him. I will still look into getting an engineer to check it out. Thanks for all the advice!

You will normally be prevented from using the existing slab because of the issues JimLee indicated... plumbing and integrity of the slab after being exposed to the heat.

I just sold a lot where a house burned down, due to a space heater, just after the 1st of the year. For value we had the slab removed and the insurance company paid for it. It did take several months fighting but it did take place and was sold last month at market value with no disclosures necessary other than a previous house was at one time on the property.