I may be naïve, and I realize pans would be best, but it doesn't seem too complex.
It's a simple 26' x 42' rectangle, one level, trusses, 3 evenly spaced overhead doors. One window on each wall.
Can't I just draw out each wall with accurate measurements, height, width, headers, openings, etc. and go from there?
General disclaimer ... everything depends on what your local building dept. requires. Since you don't give a location (usually in your personal info) and you don't even describe if it will be a pole barn or masonry foundation, no one can give you a specific answer. However, here's my $0.02 worth!
I live in a very rural county in VA and, even here, we have a building dept. that wants to approve all plans before a permit is issued ... even for a simple pole barn. But, good, hand-drawn plans are acceptable.
Generally, they want details assuring them that you are building a "quality" structure. (Of course, the permitting process also gets the new building on the tax rolls ASAP!!) Let's assume you are planning on building a pole barn ....
in addition to general layout, they want to see:
1) Depth of poles in ground an size (diameter & thickness) of concrete pad at bottom of poles.
2) Size of poles and spacing.
3) Grade around building base and how roof runoff will be handled.
4) Concrete floor pitch, thickness and expansion joints.
5) Size and spacing of girts.
6) Size and location of O/H doors. Particularly, if O/H doors are on load-bearing walls, what size of headers or LVLs. Sometimes this sizing will need input from a builder or from the building dept.
7) Window finish details. For instance, are you using Flexwrap at bottom portion of windows and self-adhesive flashing around window openings?
8) Siding material details at bottom of siding (rodent seal? Z-flashing, etc.)
9) Siding/wall detail at top (how are you closing up spaces between trusses?) Are you using OSB under siding? Will you be wrapping the building in Tyvek?
10) Certified truss drawings from truss manufacturer; truss spacing; purlin size and spacing. Hurricane clips?
11) Detail of facia, soffets, drip edge, ice guard, gutter size, roofing felt, shingles, etc. If steel roof, will there be reflective insulation layer under steel?
12) Ridge vent or spot roof vents?
13) If you are going to insulate and drywall, they may want to see insulation R value and sheetrock thicknesses planned.
This is just sort of a "typical" list details my local building dept. wants to see prior to issuing the permit. I've also found that if you are having the building built by a local builder with a good reputation, they will let a lot of these details slide as they have confidence in his work.
So, even a "simple" rectangular building usually has a number of details that need to be identified on plans. When they do the inspections, "sometimes" they will actually have your plans with them and will do a check to see if you are following them.
Your mileage may vary in your locale!! Good luck!!
