The home is flat on the concrete. When it rains, water is now getting in from the driveway concrete floor outside, wetting interior floor. My handyman says he needs to "cut into the wall & insert flashing on the wall facing the driveway. The flashing will keep the water from seeping into the bedroom." Is this the correct solution or is there something else to do?

There are a number of ways to stop water migration from a driveway against a structure, then into the property. Your handyman idea is one way of doing so. If I were you, I'd get a licensed contractors take on how they would resolve your problem via a "free" estimate. Then compare costs and percentage of success.

With one of my properties when water would flow from a roof pitched towards the back yard, then drain along the entire driveway to the street, I had lots of areas water would get under the house. SO I had two issues. Roof draining in the back yard. Two, water from the back yard draining to the street along the driveway.

Solution: 1, collect the water from the downspout three feet above the ground and run a pipe to the front of the house so water previously draining into the yard was directed to the street along the side of the house via an above ground pitched drain pipe. That took most of the roof water to the street instead of the back yard.

Solution Part 2: Install a large dry-well in the back yard with drains to well. Install a sump pump so when the dry-well got half full, it would pump the water into the drain pipe taking roof water to the street.

Solution Part 3: Along the driveway against the house, I ran a torch down vapor barrier and covered it with a 4" x 4" curb of special concrete, keeping the water from the structure.

Is the layout such that you could install a French Drain system to get the water to drain away from your home?

I wouldn't be that fond of simple flashing if the water is just laying there and not going anywhere. But you know if the place has slope or not. If it doesn't have much slope, Roberts drywell solution could work.

Is it due to the large rain amounts recently, or a long ongoing problem?

If it's just because of excessive rains, get some sandbags and put them in appropriate areas till it stops raining for the season.

If it's a long ongoing problem and the driveway actually directs water to that area, then cut the concrete across the driveway a few inches to a foot wide and remove it. Line the trench with metal and put the black pipe in it. Have a lip on the edges and get a grate that sits at the driveway level which you can drive over without collapsing it. Then put in a flexible black pipe with holes in it and slope the pipe to direct the water away. Maybe, if it's not practical to run it completely away, dig a hole about 3-4 feet around and 4 feet or more deep (a dry well) and fill the hole with rocks. Once the pipe is in place, fill the trench with rocks as well.Direct the pipe into the dry well and the water will go there and seep into the round, if the ground is porous.

I had two thoughts on this issue.

1) Keep in mind that you must be aware if you are relying on a drain pipe, you need to include in your solution something that takes into account the possibility of the pipe becoming clogged at some point. You might solve that as simply as checking each year to be sure the pipe is running clear, but you should be aware of that and have it on your maintenance list even if only rarely checking it. I did not maintain some area drains from the backyard for many years and it became very difficult to clear them although I finally succeeded. That was AFTER I had a little water leak under the sliding glass door in the kitchen. So I learned my lesson.

2) Probably more costly than necessary, but you might consider adding some redundancy to your solution since water intrusion into your house is definitely aggravating. You might be able to alter the slope of the concrete driveway just in case another solution used does get clogged or fails.

Definitely need to get it fixed both to keep water out of the house and to keep the wall (sill plate) from rotting out.

Done properly, flashing will fix it. He will have to cut a slit in the concrete to slide the flashing down into and seal it in the concrete and then attach to the side of the house.

Check the downspouts to make sure they are draining away from the house properly, the goal here is to move as much water away from this area as possible. Also the dirt grading so that the water is moving away from this area.