Most homes these days have finished basements, making it a larger and more involved job to do extra electrical work. If existing wiring needs to be changed, it may be necessary to cut into some drywall, which makes repair work a large task after the electrical is done. For houses with unfinished basements or drop-ceilings, future electrical work is relatively easy.
Also plan to have heavy power-drawing appliances on separate circuits. A little forward planning can help prevent the breakers tripping on a regular basis. Appliances you might want to consider putting on separate breakers: toaster oven, microwave, dishwasher, fridge, etc. Ranges are usually on a separate circuit already, since they require a larger breaker.
So whenever possible, keep long term electrical planning in mind. It's much easier than waiting until the last minute when it may cause a lot of extra work.