Permits and inspections

Two approvals, routinely confused

Zoning or planning approval answers whether this use, of this size, may exist on this parcel. It is about land: setbacks, height, coverage, density, use, and sometimes appearance. It is decided by a planning function, sometimes administratively and sometimes by a board that meets monthly.

A building permit answers whether the proposed construction complies with the building code. It is about the building: structure, fire safety, egress, energy, and the mechanical, electrical and plumbing systems. It is decided by a building department through plan review.

Conflating them produces one of the most expensive mistakes in residential development, which is a fully engineered design for a building that was never permitted on that parcel at that size. Zoning first, always, because it is the cheaper question and it constrains the other one.

What plan review is actually checking

A reviewer is not evaluating your design. They are checking a submitted document set against a body of adopted requirements, item by item, and returning the items that cannot be verified from what you submitted.

That framing explains most of what frustrates applicants. A comment asking for a structural calculation is not scepticism about the beam. It is a statement that the submitted set does not demonstrate compliance, which is a documentation problem with a documentation fix. Sets that are complete and internally consistent clear review faster, and the difference between a first-pass approval and three rounds of comments is usually preparation rather than merit.

Ask the department for its submission checklist and its current review time before you submit. Both exist, both are published in most jurisdictions, and the second is the number your schedule depends on.

The inspection sequence is the schedule

Inspections are ordered so that each one looks at work before the next trade covers it. That ordering is not administrative preference. It is the only opportunity to see the work.

The general shape is consistent even though the specifics are local: the foundation before concrete is placed, the structural frame once it is up, the rough mechanical, electrical and plumbing while the walls are open, insulation and any air barrier before the drywall closes it, then final inspections before occupancy. Every one of those is a gate, and passing it is what allows the next trade to start.

Two consequences follow, and experienced builders organise around both. A failed inspection does not cost you the inspection, it costs you the trade sequence behind it. And work covered before it was inspected may have to be uncovered, which is the most expensive sentence in residential construction.

Why your neighbour is wrong about the code

There is no single American building code. There is a family of model codes published by the International Code Council, and they have legal force only where a state or a local jurisdiction has adopted them. The ICC records adoption at several levels, by states and by individual jurisdictions, and publishes state-by-state adoption information for that reason. [1]

Adoption carries two variables that matter more than most people expect. Which edition, because jurisdictions adopt on their own timetable and adjacent counties are routinely on different editions. And which amendments, because a jurisdiction that adopts a model code is free to modify it, and many do, in ways that respond to local climate, geology or politics.

So a requirement that is true in one town is not automatically true in the next one, and advice that begins with the code says without naming an edition and a jurisdiction is not advice about your building. Every page on The Build Sheet that touches a code carries the same note for this reason.

How to find what actually applies to you

Ask the building department three questions, in writing, and keep the answer.

Which building code, which edition, and are there local amendments. Which energy code, which edition, and are there local amendments. And what does the department require in a residential submission.

Those three answers, from the office that will review your drawings, outrank every other source including this one. They take one email to obtain and they settle arguments that otherwise run for months.

It is worth asking a fourth question at the same time, because it costs nothing and it changes how you plan: what is the current review time, and is there a pre-application meeting available. Many departments offer one, most applicants never take it, and an hour spent with the reviewer before the drawings are finished routinely removes an entire round of comments. The people who work there are generally willing to explain what they will be looking for. Almost nobody asks them.