Blog & FAQ: everything about MEP permit drawings.

Drafting turnaround is the part we control: it depends on project size, the number of disciplines involved, and scope, and it's set in your quote before you commit to anything. A single-discipline residential set is typically faster to draft than a multi-discipline commercial package.

Plan-review turnaround is the part the building department controls, and it varies enormously by jurisdiction. Some cities clear a straightforward residential submission in days, while a busy metro plan-review queue can take several weeks, longer for commercial projects. That queue time isn't something any drafting service can shorten directly.

What does move the needle is how clean the submission is the first time. A well-prepared, code-compliant set that already addresses the errors reviewers commonly flag (missing load calculations, inconsistent schedules, unclear riser diagrams) reduces the number of correction cycles, and each avoided cycle can save weeks. If your city's reviewer does come back with comments, we handle the revisions and resubmission at no additional cost until you receive approval.

See our electrical, plumbing, HVAC, and fire protection service pages for what goes into each discipline's set.

A “stamp” (or seal) is a licensed Professional Engineer's certification that a set of drawings meets applicable code and engineering standards. It's not a formality. It's the building department's assurance that a qualified, licensed individual takes responsibility for the design.

Whether your project needs one depends on your building's occupancy type, the scope of work, and the specific state, county, or city you're permitting in, and there's no single national rule. Many jurisdictions require a stamp for commercial buildings and larger multi-family or renovation projects; some allow unstamped drawings for straightforward residential work like a like-for-like panel swap or a minor plumbing fixture change, though this varies and always depends on your local Authority Having Jurisdiction (AHJ).

Because the requirement is jurisdiction-specific, don't assume either way. Confirm with your specific building department, or tell us your project address and scope during a free consult and we'll confirm what applies. Where a stamp is required, we coordinate it through a licensed Professional Engineer as part of your project.

A complete MEP set covers three core disciplines, plus Fire Protection when your building or occupancy type requires it. The electrical portion includes power & lighting plans, panel schedules, load calculations, a riser diagram, a site electrical plan, and energy-code compliance documentation where required.

The plumbing portion includes fixture plans, water supply layouts, and drain-waste-vent (DWV) riser diagrams, sized to the applicable plumbing code. The HVAC portion includes duct layouts, equipment schedules, ventilation plans, and load calculations matched to the building envelope.

Where required by occupancy type or local fire code, a fire protection package adds sprinkler layouts, fire alarm plans, and life-safety drawings. Every sheet is labeled and numbered to the sheet-numbering and title-block conventions your specific building department expects, and delivered in both PDF and DWG formats.

Permit drawings and shop drawings serve two different audiences at two different stages of a project, and mixing them up is a common source of confusion for contractors and property owners new to the process.

Permit drawings are prepared for your city's plan-review process. Their job is to demonstrate code compliance and get official approval to build. They show the overall design intent: layouts, schedules, load calculations, and riser diagrams, formatted the way your specific building department expects to review them.

Shop drawings come afterward, once permit approval is in hand, and they're prepared for the trades physically installing the work. They go into fabrication and installation-level detail (exact routing, coordination between disciplines, and manufacturer-specific product data) that a plan reviewer doesn't need but an installing crew does.

We prepare either, or both in sequence: a permit set to get you approved, followed by shop drawings once you're ready to build.