A failed pad certification costs a builder $3,200 in re-grading and another $12,000 in closing delay carrying costs. On a 200-lot subdivision, even a 5% failure rate is a six-figure problem. Sitemark is pad certification software built specifically for grading contractors: lot-by-lot elevation logging, automatic pass/fail against tolerance, drainage slope verification, and PE-ready pad cert letters generated from field data in one click.
Most building departments in residential development jurisdictions require a grading certification — commonly called a pad certification or pad cert — as a condition of issuing a building permit. The requirement exists to protect future homeowners and the public from buildings constructed on improperly graded lots that do not drain correctly or that have structural fill placed without adequate compaction documentation.
The pad certification requirement is typically found in the local grading ordinance, the municipal building code, or as a note on the approved grading plan. In California, the requirement flows from the California Building Code (CBC) and the local jurisdiction's grading ordinance. In Texas, it is driven by city or county development standards. In Arizona, Maricopa County and most municipalities with active subdivision development have pad cert requirements codified in their grading plan approval conditions.
What building departments require on the pad certification document varies by jurisdiction, but the common elements are: the lot number; the design pad elevation from the approved grading plan; the as-graded actual elevation from field measurement; the deviation between design and actual; a pass/fail statement against the specified tolerance (typically ±0.10 ft); the drainage slope direction and percentage from the building pad; and the signature, license number, and date of the responsible contractor or licensed professional engineer.
The tolerance of ±0.10 ft (1.2 inches) is standard across most jurisdictions and grading specifications. Some more demanding projects — particularly those with tight drainage constraints or flood zone requirements — specify ±0.05 ft. Always read the approved grading plan notes before certifying. Submitting a pad cert for a lot that is outside tolerance is a professional liability exposure for the PE and a potential warranty claim for the builder.
Elevation measurements must be taken at the building pad corners and center points, not averaged across the lot. A lot where one corner reads +0.05 ft and the opposite corner reads -0.15 ft has a problem that a lot-averaged reading would obscure. Building departments that require lot-by-lot corner documentation catch this; building departments that accept a single center-point reading do not. Sitemark captures multiple elevation points per lot so the documentation is defensible regardless of the jurisdiction's review requirements.
The consequence of a rejected pad certification is not merely administrative — it is a direct financial loss for the builder. Every day that a building permit is delayed after a home sale is in escrow adds carrying costs. On a 200-lot subdivision with a builder producing 15–20 closings per month, a systematic documentation problem that causes week-long permit delays on each lot is a six-figure annual cost that shows up in the builder's margin, not the grading contractor's invoice.
Pad elevation documentation is a systematic field workflow that begins at benchmark setup and ends when the signed pad cert is submitted to the building department. Each step has documentation implications that affect whether the cert will be accepted.
Establish a benchmark elevation tied to the approved grading plan control — typically a monument or control point shown on the grading plan. Verify the benchmark by closing a level loop before beginning lot surveys. All lot elevations are referenced back to this benchmark, so benchmark integrity determines certification accuracy.
For each lot, record elevations at the four pad corners (front-left, front-right, rear-left, rear-right) and the pad center point. Record readings to 0.01 ft precision. GPS rovers with RTK correction provide ±0.05 ft accuracy in open areas; total stations achieve ±0.01 ft and work in areas with tree canopy that blocks satellite signal.
Pull the design pad elevation for each lot from the approved grading plan. Calculate the deviation (actual minus design) for each measurement point. Flag any lot where any point exceeds the specified tolerance. The tolerance check must be per-point, not per-lot average.
Measure the slope from the building pad toward the drainage outlet — typically the street, a drainage easement, or a retention basin. IRC Section R401.3 requires a minimum 2% slope for the first 10 feet from the foundation on landscaped areas. Document the drainage direction and slope percentage for each lot. Flat or negative-draining lots must be re-graded before certification.
Lots outside tolerance or without positive drainage must be re-graded and re-surveyed before a pad cert can be issued. Document the re-grade date and the corrected elevation. The original out-of-tolerance reading and the corrected reading both remain in the project record — this documents that the problem was identified and corrected, which protects the contractor if a warranty issue arises later.
From the verified field data, generate the pad certification letter with the complete lot elevation table, drainage verification, and certification statement. The letter is signed by the QC Manager or licensed PE, includes the contractor license number, and is submitted to the building department as part of the building permit application package.
On an active subdivision, multiple crews may be grading different sections of the project simultaneously. Sitemark allows multiple field crews to log elevation data concurrently to the same project, with each lot's data immediately visible to the QC Manager and project PE. When a lot is logged as passing, the system flags it as ready for pad cert generation. When it fails, the system flags it for re-grade and re-survey.
Sitemark's pad certification module is built around the lot-as-the-unit-of-work framework that grading contractors actually use. Rather than adapting a general-purpose construction management tool to pad certification, Sitemark's data model starts with the lot number and builds upward: multiple elevation points per lot, multiple grading phases per lot (rough grade, finish grade), drainage slope per lot, and pass/fail status per lot.
Log design elevation, actual elevation, and drainage slope per lot. Multiple points per lot. Pass/fail auto-calculated against your specified tolerance. Rough and finish grade tracked separately.
One click generates a PE-ready pad cert letter with complete lot elevation table, drainage verification summary, certification statement, and signature block in print-ready format.
Log drainage direction and slope percentage per lot. Auto-flag lots below the 2% minimum per IRC R401.3. Drainage verification is included in the generated pad cert letter.
Track rough grade and finish grade per lot. Each phase has its own elevation log and pass/fail status. Pad cert is generated from finish grade entries; rough grade remains in the project record.
Failed lots are flagged automatically. Re-survey entries are linked to the original failure record. The complete history of original measurement, failure, re-grade, and correction is maintained.
Clean, professional pad cert format accepted by building departments. Includes contractor license number, certification date, project address, grading plan reference, and PE stamp block.
For large subdivision projects, Sitemark generates both individual lot pad cert letters and a summary certification table for the entire phase or project. Most building departments accept the summary table format for large subdivisions, reducing the submittal package from hundreds of individual letters to a single organized report. The individual lot records remain in Sitemark for warranty period reference.
The grading contractor benefits beyond certification: when a warranty claim arises about drainage or foundation settlement two years after project completion, the complete as-graded elevation records are available in Sitemark with the original field crew, date, equipment, and measurement values. This documentation record has protected grading contractors from unwarranted warranty claims and demonstrated corrective action on legitimate ones.
IRC Section R401.3 requires that lots be graded so that all surface drainage flows away from the building foundation. The minimum slope is 6 inches of fall over the first 10 feet from the foundation (equivalent to 5% slope) for swales and 2% for other surfaces adjacent to the structure — though many jurisdictions and grading plans specify the 2% minimum as the controlling standard for lot certification. Negative drainage — where water drains toward the foundation — is the leading cause of residential foundation failures and one of the most frequent post-construction warranty claims.
Documenting drainage slopes per lot at the time of grading certification is critical because slopes can be compliant at pad cert time but fail after landscape grading, concrete flatwork, and final site work. Sitemark records the drainage slope at the time of grading certification. If a drainage complaint arises after construction, the builder and grading contractor can demonstrate whether the pad cert condition was compliant — and whether subsequent work by others changed the drainage condition.
Use Sitemark's Drainage Slope Minimum Calculator to verify lot drainage slopes before field measurement and flag lots that need additional grading attention before the survey crew arrives.
A pad certification letter is a written statement certifying that a building pad has been graded to within the specified tolerance of design elevation with adequate drainage. Building departments in most active residential development jurisdictions require a pad cert before issuing a building permit on each lot. It includes lot number, design elevation, actual elevation, deviation, drainage verification, and the contractor or PE signature and license number.
The standard tolerance is ±0.10 ft (±1.2 inches) of design pad elevation. Drainage slope must be at least 2% for the first 10 feet from the foundation per IRC R401.3. Some projects specify tighter tolerances — always verify on the grading plan notes. Elevation checks must be per-measurement-point, not a lot average, to catch corner-to-corner grade problems.
Field crews log design elevation, actual elevation, and drainage slope per lot in Sitemark's mobile app. The system auto-calculates deviation and pass/fail. From those entries, the QCM or PE generates a formatted pad cert letter with the complete lot elevation table, certification statement, and signature block — no manual data entry from field notes.
Direct costs: re-grading ($1,200–$4,500), re-survey ($400–$800), PE re-cert ($300–$600). Indirect costs: closing delay at $500–$1,500/day per lot in financing carrying costs. On a 200-lot subdivision with a 5% failure rate, that is 10 failed lots × $4,000 average direct costs + delay costs = $40,000–$90,000 exposure that pad elevation documentation software eliminates.
Yes. Sitemark allows multiple elevation entries per lot — rough grade and finish grade tracked separately with their own dates, field crew, and pass/fail status. The pad cert is generated from finish grade entries. Rough grade entries remain in the project record as documentation of the full grading process.
Lot-by-lot elevation logging, drainage slope verification, and PE-ready pad cert letters generated from field data — built for residential subdivision grading contractors.