The site plan first, then the building. A site plan, a site plan correction or a site plan exemption has to be in place before a commercial building permit application, and the two are reviewed together only with an approved concurrent review request. Under Land Development Code 25-5-2(D), as codified through Ordinance 20260521-050 effective June 1, 2026, a site plan is not required for construction up to 1,000 square feet with limits of construction up to 3,000 square feet, provided no tree over eight inches is removed, the work is outside the 100-year floodplain and it is not a new drive-in lane. An approved site plan expires three years after approval unless active building permits exist for all proposed structures, or ongoing construction activity that needs no building permit keeps it alive; a one-time one-year administrative extension is available, and anything past that goes to the Land Use Commission.
Then the plan review. From July 15, 2026 the target review times are seven business days for new construction up to 10,000 square feet, 10 business days from 10,001 to 25,000 and 20 business days over 25,000, with five for small projects and minor revisions. Plans for work in a building or portion of a building over 5,000 square feet have to be sealed by a professional engineer under Building Criteria Manual 1.8.0, new construction lists structural plans with a site-specific geotechnical report, a statement of special inspections is required on every project, and the TDLR registration confirmation is part of the application. The FY 2025-26 commercial plan review fee schedule starts at a base of $2,949.82 up to 1,500 square feet and steps up by square footage, plus a $176.76 application processing fee and a $250 fire building permit review; the plan review fee is paid at submittal and is non-refundable, and trade permit fees are paid at issuance.
What Austin does not exempt matters for a shop. On commercial property, among the exempt structures are a one-story detached tool or storage shed, playhouse or shade cloth structure of no more than 120 square feet outside a flood hazard area, a shade cloth structure for nursery or agricultural purposes without service systems and no size cap, fences up to seven feet, retaining walls up to four feet that support no surcharge, and water tanks up to 5,000 gallons. The list names no detached garage, workshop or carport exemption. A shop or garage on a house lot inside the city goes to the Residential Plan Review Division under the 2024 International Residential Code, with a 10 business day target for new construction from July 1, 2026 and a plan review fee starting at an $896.50 base plus a $106.72 application processing fee; a residential detached accessory structure is exempt only at one story, 200 square feet or less and 15 feet or less in height, with no plumbing and outside a flood hazard area. Read that 10-day target with care: no row on the residential timeline page is written for a detached garage, workshop or carport. What each building brings to the review is on the commercial metal buildings and metal shops and workshops pages.
SourcesCity of Austin Development Services, site plans, exemptions and corrections, and Land Development Code 25-5-2 on Municode (Supp. No. 174), read 2026-09-20; City of Austin Development Services, commercial plan review, read 2026-09-20; City of Austin Development Services, commercial building plan review and inspection permit fees (FY 2025-26) and the commercial building application checklist, read 2026-09-20; City of Austin Development Services, building technical codes, read 2026-09-20; City of Austin Development Services, work exempt from building permits, read 2026-09-20; City of Austin Development Services, residential plan review, and the residential building plan review and inspection permit fees (FY 2025-26), read 2026-09-20.