I recently remodeled my kitchen and replaced sink, faucet, and plumbing. The pressure was good prior to remodel but now it is very weak. I cleaned screens, checked lines, and still no increase in pressure. Any recommendations on what I can do?

Did you reduce the size of your supply pipes leading to the faucets? That could cause a drop in pressure since the volume is restricted. Also did you cahnge the stops on the supply and are they 100% open. I think your pressure is the same as always but something's is decreasing your volume.

The size is the same for the supply lines, and they are open 100%. Can I add a low cost pressure booster? Is this a good idea?

Again I think your pressure is good but the volume is restricted somewhere. Try removing the aerator to see if it was blocking the flow due to crud in the screen. You may have to open the valves on the new faucet to check for crud that broke loose during the install. If the pressue was good before the remodeling there should be no change now.

What type of pipes, also any chance of someone denting or bending or crmping the pipe. Perhaps added a new shut off valve that is not working proper.

Not the best advice I am sure, but go back to the lines and if you have to, open at various points and check pressure there, if you have pressure to where th lines start, it has to be in the line ( of the fixture) have you taken the supply line off the sink and checked the pressure without the fixture)

Actually I have not removed the supply line to check the pressure. Let me try that I'll get back to you. Thanks!

I will note, I am not near the expert that ballenger is of course, but it is just one of those common sense things, if it was OK before remodel, if is it OK in the other part of the house, it has to be in the pipe from the supply line with OK pressure to the facuet.

I bought one for a rental house ( don't know why I bought a 200 dollar one for a rental house, but I installed it and the hot water would just not turn on, I had to return it for another one,

So since I am not as smart as some of the real plumbers on here, I just take it one step at a time, and start at where does it start or stop.
When my boys were younger, we were doing the plastic pipe, they put too much glue on a fitting ( a lot of too much glue) and it almost stopped the water flow

If you remove a supply line try catching the water for a specific time like 15 seconds. Reassemble the supply and measure the water coming out of the faucet for that same 15 seconds. They should be pretty much the same. Back to you.