I don’t see an attachment. You said “they” are recommending some specific sizes - who are “they?” Your builder or any other professional who might be experienced in driveway sizes? I’d tend to follow a professional recommendation rather than skimp. If your space is too small, you’ll forever regret it as cars drive on your grass.

Sorry, i attached it now.... with my drawing skills it might not help a ton. Also, it is a reputable concrete company.

there is a plan, he just did the quote last night. I'll show when he draws up. I just wanted some info on where to trim. Could you say where you think could be cut? Thanks.

Plan needs to accommodate for any water runoff caused by the concrete.

Pic's didn't show up. Post again here in the comment section. Do you have a survey or other aerial view you can show too?

It's that plan that is needed in order to answer your question about cuts. Please photograph or scan and post it.

I'll post the proposal when he gets it to me.

If you're building the house, I'd look for input from the architect or your landscape designer. I live for trimming excess hardscape (especially concrete) but at the end of the day, it has to function. As you trim, make sure you still leave enough width and turning radius for 1) Uncle Jim and his extended cab pickup, 2) the UPS truck, 3) the septic truck if needed, and 4) a fire engine and/or rescue. We've seen people get themselves in a pickle because the emergency equipment can't physically reach them.

I just measured my 2 car garage and it's 20x20. We have a van and large SUV and have never had an issue. It really could be shorter at the lake because I'm not needing to be able to walk around the front of vehicle like I can in my garage. Plus, the lake parking is out in the open, so there are no walls to hit and its fine if the very front of vehicle hangs over edge of concrete as long as the front tire are on concrete we are good. Same goes for the doors opening outside of driveway as long as we have room to put feet. I would think that 18 deep X 20 wide would work, but we'll see. I sure don't think I need 30 feet at the end of the drive.... but we shall see what others with more knowledge have to say. Thanks.

Ask your architect about how your site circulation should be laid-out. They will most likely design it for larger vehicles than you own now because other vehicle may (will) be using it over the next 100+ years (including emergency vehicles and possibly snow removal), knowing it will also accommodate your current vehicles.

Just as a comparison a normal sized parking space is 9x18. I usually tell people to go a couple feet bigger than that because it’s always hard with doors in that space. As the others have said it depends on layout.

We've all seen examples of drives and parking areas that are undersized and later, the homeowner patches in extra pavement in order that it is not so inconvenient. To patch in later is usually unsightly, bothersome and much more expensive than getting it right in the first place. Getting it right is going to be most important at the entrance and parking destinations of the drive. The long, central run might be a place to cut $ in some way. But again, we do need to see the site plan.

When I design parking lots, perpendicular parking spaces are 10' x 20' (I use to drive a Suburban).