Travis County
Sealed Engineering Letters in Austin, Texas
Austin has the most demanding residential plan review of any large Texas city and the geology to match: limestone and karst west of the escarpment, expansive clay east of it, often within the same subdivision.
Opening soon
Sealed Engineering is not yet accepting orders. Firm registration is pending with the Texas Board of Professional Engineers and Land Surveyors, and no engineering services are being offered or performed under this brand until it is granted. Founding customers on the waitlist are contacted first when ordering opens.
What governs engineering work in Austin
- County
- Travis County
- Region
- Central Texas
- Design wind speed
- roughly 105 to 110 mph basic wind speed
- Low mapped wind speed. Exposure moves to C quickly outside the urban core, particularly on the ridgelines west of the city.
- Soil
- Edwards limestone and karst west of the Balcones Escarpment, Blackland clay east
- West Austin sits on rock with thin, variable soil cover and occasional voids. East Austin sits on deep expansive clay. The transition is abrupt.
- Residential plan review
- the City of Austin Development Services Department
- Travis County reviews unincorporated areas, and Austin's extraterritorial jurisdiction adds a layer that catches people out.
- TDI windstorm area
- No, WPI-8 does not apply here
Wind speeds are the ASCE 7 band for the area and are given as planning context. Every sealed document uses the value looked up for the specific site address, along with the exposure category that actually applies to that site.
Engineering in Austin, in practice
Austin's residential plan review is thorough and slow relative to the rest of the state, and the practical consequence for a contractor is that a rejected letter is far more expensive here than the letter itself. A comment answered precisely, in the reviewer's own terms, citing the code edition the city has actually adopted, is worth more in Austin than anywhere else in Texas.
The geology splits at the Balcones Escarpment, which runs through the city. West of it, in Westlake, Lakeway, and up through the hills, foundations bear on limestone with shallow and highly variable soil cover, and the classic problem is differential bearing between rock and engineered fill rather than shrink and swell. East of I-35 the soil is Blackland clay and the problems look like Waco's.
The renovation market drives an unusual share of the structural letter work here. Central Austin housing stock from the 1930s through the 1960s is being opened up, added onto, and converted at high volume, and wall removals and framing modifications on pier and beam bungalows are the most common single request in this market.
Austin's extraterritorial jurisdiction catches a surprising number of projects. An address outside city limits can still fall under city review for some items while the county reviews others, and establishing which office owns the comment is the first thing the intake does rather than the last.
What Austin orders most
Ordered by local weight rather than alphabetically. Every deliverable in the catalog is available for a Austin address; these are the ones this market actually asks for.
- Documents or site visitBeam and Header Sizing LettersTaking a wall out, or opening one up. The beam gets sized against the real loads, the bearing gets checked, and the load path gets followed all the way down instead of stopping at the ceiling.What it contains
- Documents or site visitStructural Letters for PermitsPlan review asked for a sealed letter and the project stopped. This is the deliverable that restarts it: a specific structural question answered, sealed, and addressed to the reviewer who asked.What it contains
- Site visit requiredFoundation Inspection ReportsAn independent engineering opinion on what a foundation is actually doing: a relative elevation survey, documented distress, and a conclusion that is not written by anyone selling piers.What it contains
- Document reviewSolar Structural LettersThe stamped letter your plan reviewer asks for before a rooftop array goes on: existing framing capacity, wind uplift at the actual site, and attachment spacing that resists it.What it contains
- Document reviewCarport and Patio Cover PlansA small plan set that passes plan review: footing schedule, post and beam sizes, and the uplift connections that matter more than anything else on a structure this light.What it contains
Austin questions
Why does Austin plan review reject letters other cities accept?
Austin reviews residential structural submittals more closely than most Texas jurisdictions and holds them to the code edition the city has adopted with its own amendments. The letters that get rejected here usually cite the wrong edition, answer a general version of the comment instead of the specific one, or state a conclusion without the values the reviewer needs to check it.
Is a house in West Austin on rock safe from foundation problems?
It has different problems rather than no problems. Building on limestone often means part of the foundation bears on rock and part bears on fill placed to level the site, and differential bearing between those two is a real source of distress. Karst features and shallow voids are also a West Austin issue that simply does not exist east of the escarpment.
I am opening up a 1940s bungalow. What does the city want?
Typically a sealed letter covering the beam replacing the removed wall, its bearing, and the load path down through a pier and beam foundation that was not designed for a point load. Attic photographs showing the framing above the wall are the single most useful thing to send at intake, because they establish what the wall is actually carrying.
Nearby Texas markets
Sealed documents for Austin property
Tell us the address and the document you have been asked for. Austin sits in Travis County, and both the wind values and the reviewing office follow from that.
Opening soon. Founding customers get first turnaround slots.