Garage Plans for Permit, Attached and Detached
Garage plans drawn for your lot and your code, with the foundation, framing and fire separation details your building department will check.
- Stamped by a PE licensed in your state
- Built to IBC, IRC and local amendments
- Plan-check comments answered
A garage designed for your lot, not a catalog
Stock garage plans look simple until they reach the permit counter. The reviewer wants to know where the garage sits on your lot, how the slab and footings are designed for your soil and frost depth, how the walls resist wind and seismic forces through wide door openings, and, for attached garages, how the living space is protected from fire and fumes. Good garage plans answer all of that.
We prepare garage plans for detached one-, two- and three-car garages, attached garages, garage additions, shops with storage lofts and garages with an apartment or bonus room above. Each set is drawn to the code your jurisdiction enforces and, where required, sealed by a Professional Engineer licensed in your state.
Because wide garage door openings and long roof spans are structural questions as much as layout questions, we prepare the architectural and structural sheets together, including the foundation design and the portal frames or braced wall panels that keep the front wall stable. You get one set that the zoning reviewer, the building reviewer and your framer can all work from.
What you receive
- Site plan with setbacks and driveway
- Garage floor plan and slab layout
- Exterior elevations and building section
- Foundation and framing plans
- Garage door header and wall bracing details
- Fire separation details for attached garages
Garage types we design
From a basic detached two-car garage to a workshop with living space above, we size the drawings to the project.
Detached garages
One-, two- and three-car garages and RV garages with slab, footings, wall framing, roof framing and site plan, sized for your snow, wind and seismic loads.
Attached garages and additions
Garages added to an existing house, with the roof tie-in, shared wall separation, door rating and step-down details reviewers check on attached construction.
Garage apartments and bonus rooms
Living space above a garage, including floor-ceiling fire separation, stair design, egress windows and the floor framing needed to span across vehicle bays.
Workshops and storage garages
Taller walls, oversized doors, storage lofts and heavier floor slabs for vehicle lifts, equipment or hobby shops, with the engineering those features require.
Post-frame and steel garages
Pole-style and metal garage buildings with embedded posts or steel frames, coordinated with our pole barn and metal building engineering for the structural side.
Carports to garage enclosures
Converting an open carport into an enclosed garage, checking the existing posts, beams and footings and adding walls, doors and bracing to code.
Your Stamped, Permit-Ready Plans Start With One Upload
Send your drawings or describe the project. A licensed engineer reviews it and sends a clear, fixed-fee proposal, often within hours.
- Free and no obligation
- Reviewed by a licensed PE
- Secure file upload
What garage plans for permit include
A complete residential garage set is short but has to be thorough. Building departments typically expect:
- Site plan with the garage footprint, distance to property lines and the house, driveway, and drainage.
- Floor plan showing overall dimensions, door and window locations, slab slope toward the vehicle entrance, and any stairs, loft or attic access.
- Elevations of all four sides, with height to ridge, roof pitch and exterior materials.
- Building section showing slab, footing, wall height, roof framing and insulation where the space will be conditioned.
- Foundation plan with footing sizes, slab thickness, reinforcing and anchor bolt layout.
- Framing plans and details including the garage door header, wall bracing, hold-downs and roof truss or rafter layout.
Many building departments also ask for truss manufacturer drawings, which we can review and coordinate through our truss review service. If the garage will have electrical service, a subpanel or an EV charger, a simple electrical layout is often added, and in cold climates the plans note whether the space will be heated so the right insulation and energy requirements apply.
Detached garages that will be used only for parking and storage are usually unconditioned. If you intend to heat, cool or insulate the space, say so at the start, because it changes the wall and roof assemblies the reviewer will expect to see.
Fire separation for attached garages
When a garage shares a wall or ceiling with living space, the residential code requires separation to slow the spread of fire and keep exhaust out of the house. Our attached garage plans detail:
- Gypsum board on the garage side of walls and ceilings that separate the garage from the dwelling, with heavier type X board when there is habitable space above.
- Protection of structural members that support the separation.
- A solid or fire-rated door between the garage and the house, self-closing where your jurisdiction requires it.
- No direct opening from the garage into a sleeping room.
- Ducts and penetrations through the separation built to code.
Garage floors must be a noncombustible surface sloped toward the vehicle door or a drain, which we note on the plan and section. The door between the garage and house usually involves a step, and we show the landing and riser height so the transition meets stair rules.
Detached garages built close to the house or to a property line can trigger fire-resistance requirements of their own. We check those distances on the site plan and add rated wall assemblies or limit openings only where the code calls for them.
Where an attached garage contains fuel-fired equipment such as a water heater or furnace, we also show the elevation and protection requirements that apply to appliances installed in garages.
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- Free and no obligation
- Reviewed by a licensed PE
- Secure file upload
Engineering the wide door wall
The front wall of a garage is mostly opening. A 16- or 18-foot door leaves short wall segments on each side to resist wind and seismic forces, which is why the garage front wall is one of the most common structural corrections on garage permits. Depending on your location and wall height, we use the residential code’s portal frame bracing methods, engineered shear walls with hold-downs, or a steel moment frame for very wide or multiple openings.
The header over the door also carries roof load, and in snow country that load can be substantial. We size the header, posts and footings under the posts for your design snow load, so the door opening does not sag and the door keeps operating smoothly.
Wind is the other driver. In hurricane and high-wind regions, the garage door itself must be rated for the design wind pressure, and the roof needs a continuous load path of straps and connectors down to the foundation. We specify those connectors on the plans and note the door design pressure your supplier has to meet. On sloped sites we also check whether the back or side walls retain soil, which changes how the foundation is designed.
Garage plans that can grow into living space
Many owners build a garage now and plan to finish a room above it or convert part of it later. If that is the plan, it is far cheaper to design for it at the start. We can size floor framing for future living space, frame the roof to allow a usable attic, rough in plumbing locations and place windows that will satisfy egress later.
Good planning also covers the site. Placing the garage where it can meet ADU setbacks, leaving room for a separate entrance and running a sleeve for future water and sewer lines are small steps that can save a great deal of trenching and redesign later.
When the time comes to convert, the original garage plans become the base for an ADU or bonus room permit. Our ADU plans service handles garage conversions, including the slab, insulation, separation and utility upgrades the conversion requires. Because we already have the structure documented, the conversion set moves faster and the existing framing can be credited instead of rechecked from scratch.
Even if you never convert, a garage built with these options adds flexibility and resale value at modest extra cost.
Common garage projects we draw
- Detached two- or three-car garage
- Attached garage addition
- Garage with apartment above
- Workshop or RV garage
- Carport enclosed into a garage
- Garage rebuild after storm or fire
How it works, start to finish
From your first message to stamped drawings, you work directly with the engineering team.
- 1Share your projectSend the address, scope and any drawings, photos or plan-check comments. Two minutes is enough.
- 2Receive a fixed-fee proposalAn engineer reviews the scope and replies with a firm price and delivery date for your garage plans drawings.
- 3Engineering and draftingWe run the calculations and prepare drawings to the codes your jurisdiction enforces, checked before sealing.
- 4Stamped set deliveredYou receive a sealed PDF set ready to submit, and we answer any plan-check comments within scope.
Codes and standards for garage plans
Garage plans are prepared to the edition of each code your jurisdiction has adopted:
- International Residential Code (IRC), including garage and dwelling separation provisions
- International Building Code (IBC) for commercial or larger accessory buildings
- ASCE 7 for wind, snow and seismic loads
- NDS for wood framing and ACI 318 for concrete slabs and footings
- Local zoning rules for accessory structure height and setbacks
How licensing works. Engineering drawings must be sealed by a Professional Engineer licensed in the state where your project is located. PE Engineer works with a network of state-licensed PEs, so every set is reviewed and stamped by an engineer with an active license in the state where your project is located. Their name and license number appear on the seal, exactly as your building department requires.
Related services
Pole Barns & Metal BuildingsStamped pole barn plans, post-frame shops and garages, barndominiums and foundations for pre-engineered metal buildings, designed for your snow and wind loads.Explore More
Site & Plot PlansScaled site and plot plans showing property lines, setbacks, easements, lot coverage, utilities and drainage for residential and commercial permits.Explore More
Foundation DesignFootings, slabs, stem walls, piers and pile foundations designed and PE stamped for your soil, loads and local code.Explore MoreFrequently asked questions
Do I need a permit to build a garage?
Almost always. Most jurisdictions exempt only small one-story accessory buildings below a set floor area, and garages are typically larger than that. Attached garages always require a permit because they change the house itself. Send us your address and we will confirm the local threshold and what the application must include.
Can I use a stock garage plan from a catalog?
You can use it as a starting point, but stock plans usually lack a site plan, local wind, snow and seismic design, and foundation details for your soil and frost depth. We adapt stock plans into permit-ready sets for your address and add the engineering your jurisdiction expects.
Do garage plans need to be stamped by an engineer?
Many simple detached garages can be built from prescriptive code provisions without a seal. A seal is commonly required for wide openings, high wind or seismic areas, living space above, steel frames or when the reviewer asks for engineering. We tell you which applies before you order.
How thick does a garage slab need to be?
Residential garage slabs are commonly 4 inches thick over a compacted base, with thickened edges at the perimeter. Heavier vehicles, vehicle lifts, expansive soil or poor fill may call for a thicker reinforced slab, which we design for your intended use and site conditions.
Can you design a garage with an apartment above it?
Yes. We design the floor framing over the vehicle bays, the fire separation between garage and living space, the stair, egress windows and the plumbing and mechanical layout. Where the apartment is an ADU under local rules, we prepare it as a full ADU permit set.
How long do garage plans take?
Most residential garage sets are delivered within a few business days once we have the site information, your preferred size and layout, and any truss or door details you have selected. Rush service is available when your builder has a start date to hold.
Get your free garage plans proposal
Tell us where the project is and what you need. Attach any drawings, photos or plan-check comments. A licensed engineer reviews every request.
- Upload your filesPlans, sketches, photos or comments
- Get a fixed-fee proposalUsually the same day
- Receive stamped drawingsSealed by a PE licensed in your state