Biggest cost drivers for construction are land prices, permits and taxes, materials, and interests.

You cannot make permits, taxes, and land prices to go down. Interest can be "tamed" if you build quick and sell quick. And most material prices are driven by transport.

Before you jump into the sector remember a great technology for construction was drywall (Pladur, Knauf, etc): it lowered time (and costs) to build inner walls.

Anything electronic, like automated window blinds... etc is not interesting for the sector: prices are high, cost to deploy are also high. It won't get mass adoption unless customers want to pay 2x-10x more for a house.