What drawings do you need for a garage conversion permit?

Published October 3, 2026 · TraceBIM permit guides

Turning a garage into a bedroom, home office or family room is one of the most common ways to add living space. A garage was built to store cars, not people, so the building department wants to see how you will make it safe and comfortable to live in. This guide walks through the drawings you will typically need and what reviewers usually check.

This guide is general information, not legal, code or engineering advice. Permit rules differ between states, counties and cities and change over time. Always confirm requirements with your local building department.

Do you need a permit?

In most places, yes. Converting a garage changes its use: from a space for cars (often called "non-habitable") to a space where people live, sleep or work ("habitable"). That change is usually what triggers a permit, even if you are not moving a single wall. Adding windows, insulation, heating, electrical circuits or plumbing usually needs permits too.

Some areas also have zoning rules about garages, for example a requirement to keep a certain number of off-street parking spaces. Converting the garage may affect that, so it is worth asking the planning or zoning desk early, before you spend money on drawings.

Rules vary a lot from one city or county to the next. Always confirm with your local building department what applies to your property.

The drawings you'll typically need

Exact requirements vary, but a typical garage conversion submission includes:

• Site plan: a bird's-eye view of your lot showing the house, the garage, property lines, and where parking will go after the conversion.
• Existing floor plan: the garage as it is today, with walls, doors and the overhead garage door.
• Proposed floor plan: the new layout, showing new walls, doors, windows, room names and dimensions.
• Elevations: flat, straight-on views of each outside wall that changes, especially where the garage door is replaced by a wall and window.
• Section: a "sliced" view through the space showing floor, wall and ceiling build-up, ceiling height and insulation.
• Framing notes or details: how the new wall in the old garage door opening is built and supported.
• Egress window details: size and sill height of any window meant as an emergency exit from a bedroom.
• Energy and insulation notes: insulation in the walls, ceiling and floor, plus window performance.
• Electrical layout: outlets, lights, switches, and smoke and carbon monoxide (CO) alarms.
• Plumbing layout: only if you are adding a bathroom, sink or laundry.
• Mechanical (heating and cooling) notes: how the new room will be heated and cooled.

What plan checkers commonly look for

A "plan checker" is the person at the building department who reviews your drawings. On garage conversions they commonly focus on:

• The floor. Garage slabs are often lower than the house floor and may slope toward the door. Reviewers want to know how you will level it, insulate it, and deal with moisture.
• Ceiling height. Living spaces have a minimum ceiling height in most codes. Show the finished height clearly in your section.
• Emergency exit (egress). A room used as a bedroom usually needs a window or door large enough, and low enough, to climb out of in an emergency.
• Separation from the house and any remaining garage. If part of the garage stays a garage, the wall between it and the living space often needs fire-resistant construction.
• The old garage door opening. How the new wall is framed, insulated and finished, and how it sits on the foundation.
• Insulation and energy. Garages are usually uninsulated. Expect questions about insulation and window ratings.
• Smoke and CO alarms in the right locations.
• Light and ventilation. Habitable rooms generally need natural light and fresh air from windows, or mechanical ventilation.
• Parking. Whether the property still meets local parking requirements.

Common reasons submissions get sent back

• Missing dimensions, or room sizes that do not add up.
• No section, so the reviewer cannot see ceiling height or insulation.
• Bedroom windows with no size or sill height noted.
• No detail for the infill wall where the garage door used to be.
• Smoke and CO alarms missing from the plan.
• Drawings with no scale, no title block, or no project address.
• Not addressing parking when the jurisdiction requires it.

"Sent back" usually means you receive a list of corrections. You fix the drawings and resubmit, which costs time. Clear, complete drawings reduce the back-and-forth.

How to make the drawings yourself with TraceBIM

TraceBIM is a web app (it works on an iPad too) that turns a rough sketch or a plain description into professional drawings. You do not need to know drafting software or drafting vocabulary.

1. Sketch or describe your space

   Draw a rough plan of the garage on paper or right in the app, or describe it in plain words: "20 by 22 foot garage, replace the garage door with a wall and a window, add a bedroom and a closet." Rough is fine. Measure your walls with a tape so the dimensions are right.

2. Let the AI draft the drawings

   TraceBIM's AI drafts floor plans, elevations and sections from what you gave it, with dimensions, standard drawing symbols and a title block on each sheet.

3. Review and adjust

   Check every dimension against your tape measurements. Name the rooms, mark which window is the bedroom egress window, and add notes about insulation and alarms. You can ask the AI for changes in plain language, or edit directly.

4. Export a PDF set

   Export the sheets as a PDF and submit them with your application, or hand them to your contractor, designer or engineer.

Be realistic about what the app does and does not cover. TraceBIM makes the drawings. Some things on the checklist above come from elsewhere: a property survey, energy compliance forms, product data sheets and, when required, engineering calculations or a professional's stamp. TraceBIM's Studio plan is free during early access, no credit card is needed, and every new workspace comes with starter AI credit.