Both come before the slab is formed. Inside the city, a floodplain development permit is required in any special flood hazard area, under an ordinance that adopts both the Williamson County flood study of December 20, 2019 and the Travis County study of August 18, 2014, administered by the director of public works. A new or substantially improved commercial or other non-residential building needs its lowest floor at or above base flood level, or a watertight design below it that an engineer or architect certifies.
Trees are the other line item on a business lot. A tree eight inches or more across, measured 4.5 feet up, is protected, except that on developed lots in SF-1, SF-2, SF-3, SF-D, MH, TF and MU-L, and on developed lots under 15,000 square feet elsewhere, only monarch trees are, and on undeveloped lots in those cases the line is 20 inches. Hackberry, chinaberry, Chinese tallow, Osage orange, Texas common cedar and honey mesquite are not protected. Removal takes a permit, and replacement is inch for inch or $150 an inch from eight to 19.99 inches, two to one or $300 an inch up to monarch size, and three to one or $450 an inch beyond. Grading and site development work in or within 500 feet of a residential zone runs only from 7:00 a.m. to 6:00 p.m. Pad work and stormwater acreage: pad, grading and stormwater acreage.
FromCity of Round Rock Code of Ordinances, Part III, Sections 8-160 to 8-162, flood damage prevention (Municode, Supplement 26) (read September 27, 2026).
FromCity of Round Rock Code of Ordinances, Part III, Chapter 8, Article III, tree protection and preservation (Municode, Supplement 26) (read September 27, 2026).
FromCity of Round Rock Code of Ordinances, Part III, Chapter 8, Article X, buildings and building regulations (Municode, Supplement 26) (read September 27, 2026).