Foundation inspection / engineer reports

Two very different things are called a foundation inspection here, and the price tells you which is which. A licensed professional engineer's evaluation is a paid engagement ending in a sealed written report. A contractor's "free inspection" is a sales visit ending in a proposal. Both can be useful. Only one involves a party with no financial interest in the answer.

The regulatory asymmetry is worth stating plainly: Texas licenses professional engineers, and it does not license foundation repair as a trade. That is why several local cities route the technical judgment to an engineer rather than to the contractor. North Richland Hills states that "a Texas Licensed Engineer sealed design and inspection letter is required for all foundation repair projects" (City of North Richland Hills). Arlington has required a permit for residential foundation repair since November 1, 2011, with two engineer-sealed plan sets at submittal and an engineer's letter at final inspection (City of Arlington). Denton requires a permit with an engineer-sealed letter or plan for all foundation repairs, at a $100 fee (City of Denton). In much of the Metroplex an engineer is not optional; the only question is whether the engineer works for you or for the contractor.

What a real inspection consists of

An engineer walks the exterior looking at brick joints, lintels, and crack direction and width, then the interior for door and window operation, drywall separation and floor slope. The measurement that matters is an elevation survey: readings on a grid across the floor with a manometer or laser level, recorded as a contour of relative elevations. That gives total differential movement and its shape — dished, domed, or tilted — which distinguishes settlement from heave. A thorough evaluation also covers drainage, grading, downspouts, trees, and plumbing, since a leaking supply or sewer line under a slab in this clay produces localized movement no pier will fix.

The tolerance question the free visit rarely mentions

An out-of-level floor is not automatically a damaged foundation. Reviewing residential foundation performance criteria, one engineer notes that "an overall foundation levelness tolerance of 1.5" (i.e., + or – 0.75"), which ACI 117 specifies, is widely considered to be an acceptable construction tolerance for Slab-on-ground foundations," and that "when there is a difference in floor elevation and there is no accompanying distress ... the out-of-level condition is most likely due to original construction and not foundation movement" (Brumley, Post-Tensioning Institute). That paper also records that Texas criteria using 1 percent tilt and L/360 deflection require associated distress to accompany the out-of-tolerance condition. An engineer applies that framework. A salesperson holding a level has no reason to.

Local soil context is part of a competent report as well. In Blackland Prairie clay, series such as Houston Black, Heiden and Ferris test plasticity indexes of 28 to 42 in the very high shrink-swell class (USDA Soil Survey of Tarrant County), and Texas practice treats a weighted plasticity index above 15 as expansive, with sites capable of over 1.0 inch of movement warranting special design consideration (Texas Section ASCE). Seasonal movement of a fraction of an inch is normal in this soil, and a report that does not acknowledge that is not describing North Texas.

Prices

Texas engineer inspection pricing is published at $350–$1,000, with a detailed evaluation including laser-level elevation mapping at $500–$750, and by foundation type at $350–$700 for slab-on-grade and $500–$1,000 for pier and beam; engineer hourly rates run $150–$300 (Texas Foundation Compass). A DFW guide puts a structural engineer evaluation at $400–$1,000 (The North Texas Home Guide). One local firm publishes a flat $1,100 inspection including an elevation survey, credited toward repairs if hired, alongside $600–$900 for a standalone elevation survey by a professional surveyor in North Texas and $1,200–$1,800 for an independent engineer's written report (Tri-County Foundation Repair). Permit-related engineering is priced separately: an engineering report at $300–$800 initially and a final certification letter at $200–$500 (Stratum Foundation Repair).

Whether an elevation survey is bundled into a given fee varies by firm; confirm it in writing rather than assuming, because the survey is the part you are actually paying for.

Questions and warning signs

Ask for the engineer's Texas license number and whether the report will carry a seal. Ask whether an elevation survey is included, on what grid spacing, and whether you receive the readings and not just conclusions. Ask whether the engineer does repair work or is paid by a repair company. Ask whether a plumbing test is recommended before any structural conclusion.

Treat these as warning signs: a free inspection that produces a pier count and a price the same afternoon with no elevation readings; a report that recommends a specific contractor; a same-day discount attached to an inspection finding; a claim that any measured out-of-level condition proves damage; and a proposal to underpin a house where nothing is cracked, nothing is sticking, and the only evidence is a marble rolling across a floor built to a 1.5-inch tolerance.