When preparing to install base cabinets, some attention needs to be paid to the condition of the back wall and floor where the cabinets will be placed. The floor needs to be solid and level. If either of these conditions are not true, the floor needs to be repaired until they are both true. A small amount off level is acceptable as long as you do not mind putting spacers in to level the cabinets. If the floor is weak, fix it. The weak floor might allow fully loaded cabinets to fall through.
The back wall needs to be relatively square at the corner. This is more true if you intend to put cabinets around the corner. A corner that is not square can create real problems for the do-it-yourself project. As long is it is not off more than about an inch over a distance of about 10 feet, you will probably be able to hide it with trim, spacers, and caulk. For amounts more than that, you may want to call in a professional for advice.
Any appliances that will be installed along with the cabinets need to be taken into consideration while planning the project. Will the stove be a full size, drop-in, or range top? This will change your requirements. For a regular stove, just stop the cabinets about 1/4 to 1/2 inch on either side. With a drop-in, the cabinets need to come right up to the edge so that the top of the stove can meet the counter. For a range top, the cabinets will run right on through the area. However, you will need to plan for the electric in all three cases.
The placement of a sink will be critical. It will have to be plumbed. If a dishwasher is being installed, the slot to the left or right of the sink is the idea place for it. This will make it easy to run the supply and drain lines. Do not forget that the counter has to be cut for the sink.
Normally, the cabinets will sit on the floor. Measure the height of the cabinets and mark a line along the wall. This will give you a guide for keeping the tops of the cabinets level. Once all of the cabinets are placed and fit properly, screw them to the wall and to each other. Be careful not to leave any screw points sticking out where they can cut a hand or arm reaching into the cabinet.
When the cabinets are solidly attached, bring in the counter top. Put it in place. Do whatever adjustments are necessary to make the corner joint fit right. This is where spacers come in. When you have the counter top placed, screw it down from underneath. Use silicone or caulk along the back. With a little care, you will be able to hide any extra gaps with this caulk.
After the cabinets are installed, attach any hardware like door handles that you need. Install the sink and stove. Check for leaks and that the stove works properly, and the job is complete.
