DIY AND INSTALLATION OPTION AVAILABLE December Offer 500 off All tiled roof conservatory kits when order is placed in December. Offer only applies to full kits. This would be the most economical conservatory to add on to an existing structure. The lean to conservatories use one existing wall of that structure or even a property garden wall. It can also enhance the beauty of the structure or be used to upgrade the existing patio or deck area. This not only gives more outdoor and indoor options but it allows entertaining guest for outdoor functions to have an indoor option with inclement weather.