Seeking advice: Build on Site Sheds

For those experienced, I'd like some advice on having a small shop built in my backyard. We had a Home Depot wood-framed shed built when we bought our first home. it was 12x16' with a 6' loft. We spent about $3800 on construction, not including tree removal and city permits. We put it on cinder blocks and it has held up very well. We repainted it six months ago.

We moved into a new house and need a bigger shop. I need space for yard tools, a bigger loft storage space, a garage door to roll motorcycles in and out, and a lean-to to hang kayaks from the roof and park a boat trailer underneath. Looking at a 14x20' layout with a horseshoe loft. I'd like to pour a slab foundation for this one. I'm looking at the 14x20 because that's the biggest our local shed builder does:

The cost of the steel shed construction alone is right at $11,000 with tax. This includes garage door, loft, and electrical. We'll have to get a permit, have some trees removed, and pay for a concrete slab before construction.

My question is this: Would I be better off having a wood-framed shed built by a contractor at this point? We're most likely in this house for the long haul. My neighbor had a 30x30 shop built for his race car and boat. It's on a slab and he spent $35,000 building & outfitting it for his needs. My budget is $20,000, tops for tree removal, concrete slab, and construction.

 

Bump

 

Build one yourself. Just take a look at how they are constructed by looking at several at HD. Easy enough to just upsize one of theirs.

 

That’s a lot of windows in the photo. You’ll lose a lot of wall space to hang things if you try to keep the windows free. Also, if you decide to build one, a standard straight pitch roof is easier than the gambrel style (barn roof).

Edit: windows in the garage door will give you light without losing wall space.

 

Cut down trees, 4 pines, and a bunch of other stuff in November. $4000
Graded the area in December.
Poured a concrete slab in January. $2500
Had a shop built and delivered later in January. 16x24. Two storage lofts and a 10' wide garage door. $11,500
Trying to get stuff moved in and set up on the weekends.
Will run wiring and add a 10x16 lean-to on the backside to store my boat and kayaks.
Need to build up some earth for a natural ramp to the garage door.
Will house camping gear, 6x4' model railroad layout, motorcycle, yard tools, mower, workbench, tool cabinets, and fishing gear.