The following paragraphs summarize major construction codes only. â–« Beam and column sizes and locations.The Site Plan must locate the permit address and include a north arrow, site dimensions, and street names. Can anyone guide me in the direction of where I can find floor plans for a building that I own? Your help is much appreciated! The best Illinois style house floor plans. No preliminary plans. Plans shall be 24"x36" in size and indicate wall, floor, foundation, elevations, sections and details on them. What should house plans include? For new buildings and additions include all setback dimensions from the property lines, the construction type and number of stories.