SWim dish, two way splitter, one line to house one, one line to house two. (Sounds like it's two houses on one piece of property). Another splitter at house one, splitting again, twice, one line to DVR, one to HD receiver. (3 tuners total). House two, another splitter, one line to each receiver. (3 tuners now, +2, 5 tuners total) So that will max out the SWiM LNB with 8 tuners. If you need to go above that in the future you would need to go back to a standard slimline LNB, run four lines from the LNB to a SWiM 16 or 32 multiswitch. Then reinstall the single lines to each house. You could put additional splitters on at each house as necessary.
Joe does have a point about the electrical systems. If they are not on the same drop from the street, you could have some ground issues. Not likely but possible. I would not worry about it, just put the power inserter for the SWiM on the same house as the bond you ground your system to. If you run into ground hum or signal issues, you will need to add some ground rods along the run to the second house. Should solve the problem. You could also put a dish on each house and solve the problem completely.
By the way, unless you install a band stop filter at the entrance leg to each house, if you have MRV (whole house DVR service) both residences will be able to share recorded programs.