What are the Standard Sizes
Doors for residential areas will depend on the size of the car. Whether you have an SUV or a mid-size car, the width and height of the doors will vary. And to keep consumers happy and satisfied (plus increase sales), many manufacturers are making personalized doors as well. This way, no matter what size of your car, you can easily accommodate it in your garage. Of course, the size of the house and the space for the door available also plays an important role. However, if you're just building a new home, you can easily alter the size of the garage to fit the car.
There are almost all manufacturers who have the standard door sizes. However, there are few other manufacturers who cater to special requests for golf cart or RV door sizes. So if you, somehow, couldn't find the right size for your garage, you can perhaps widen the search to those manufacturers that can meet your requirements.
There are some doors which can't go below a certain size because of the local building codes. In that case, you won't be able to get a specific size as per your needs. So check the building codes of where you reside, and then go shop for the doors.
Along with the width and height for the doors, you also need to keep in mind the internal headroom and the reveals should also be measured. The correct measurements will keep enough clear space under the lintel of the ceiling and the width on either sides of the garage where you can stand. Which is why, it is essential you do extensive research on the type of the garage you want along with the size comparison.