The first item of business to attend to is to install a ramp so that you can easily get into your home while sitting in a wheelchair. Check out what you feel comfortable with as you may need two ramps. In case of an emergency such as a fire, you may want to have a ramp accessible to the back door. You may have friends or family members that can do this job for you; if not, you can hire a handyman to install a ramp.
Once you are inside of your home check out your kitchen. You may need the countertops lowered so that you can reach them better. Or you may choose to save money and lower half of the countertops if you are able to walk with a cane or walker. This way, you can keep frequently used items on the lower countertop for easy access while you are sitting in your wheelchair. Your kitchen sink may need to be lowered as well. You want to be able to wash your dishes comfortably. You also want to be able to get a drink of water with ease.
Make sure you can easily get to your refrigerator, microwave and stove. You may decide to hire someone that has experience in this such as a safety inspector. Many places will do this service for the elderly to make sure their home is safe for them.
Make sure your bathroom is easily accessible. You may hire someone to widen the doorway to the bathroom. You can even hire someone to move the shower or sink around if it will make it easier for you to move around. Of course, this is an expensive home improvement but it will be well worth it in the long run.
Check to see if you can reach all of the light switches. If not, you may need to replace some of them with a new light switch and possibly new wiring. Once this is completed you will need someone to fix the drywall from the previous light switch. You may take the cheaper route and purchase a lamp or two and put it/them on a table where you can easily reach the lamp or lamps.
If you have a stairway you may decide to invest in a chairlift that electrically goes up and down the stairs with the push of a button.
If you are looking to spend at least ten years in your new home, you may decide to do all or some of the above handicap accessible home improvements. Do not spend a fortune if you know you will be moving in the next few years. If you do, you will end up losing money in the long run on your home investment, but above all, your safety is the most important.