What a bright idea!
But if you want to use them as year-round extensions you need to invest in a design which is well built, well heated and insulated and secure - conservatories are often an easy entry for burglars.
B&Q have a range of conservatories, including their quality Victorian design which comes as an easy DIY structure in weather-treated hardwood with double-glazed toughened safety glass side glazing and double layer polycarbonate roof.
Double-timber French doors have three-point security locking and flush bolts. You will need to prepare your own base, but there are no brick walls to be built. The 2.7m by 3.7m sized room costs pounds 2,599.
Wickes have one of the largest conservatory ranges - 10 designs, 140 different size options, from a simple UPVC lean-to at around pounds 1,500 to a grand Edwardian-style model upwards of pounds 5,000.
Many conservatories are too high for single-storey buildings, but Wickes have introduced the Worcester bungalow conservatory in low-maintenance UPVC at pounds 5,449 - delivered but not erected.
If you need just a summer lounging space, take a look at Wickes' new Geneva summer house which can be erected on a simple paved base in a day by two people.
It comes part-assembled, including floor and pre-hung windows and doors, complete with glass, fittings, roof felt and instructions.