Construction inspection & materials testing
Grading observation, compaction testing, and special inspection of soils, concrete, and masonry — documented properly, so your project passes inspection the first time.
What it is
A soils report makes recommendations. Construction inspection confirms the contractor actually built to them. The California Building Code requires many of these observations and tests, and the building inspector at the City of Lancaster, City of Palmdale, or Los Angeles County will ask for the paperwork before signing off.
We provide the field services that tie it together:
- Grading observation — confirming that unsuitable soil is removed, the bottom of the excavation is firm, and fill is placed in proper lifts.
- Compaction testing — field density testing of building pads, utility trench backfill, retaining-wall backfill, and paving subgrade, compared against laboratory maximum density.
- Footing excavation observation — verifying that footings bottom out in the soil the report was based on, at the depth it called for.
- Special inspection — the code-required third-party inspections of soils, concrete (reinforcing placement, sampling, and test cylinders), and masonry (grout, reinforcing, and placement).
At the end of grading we issue a compaction / rough-grading report that the building department needs before it will release the next phase of work.
When you need it
You'll need us on site at these points in construction.
Pad grading
Over-excavation, recompaction, and fill placement for new homes, ADUs, and commercial pads.
Footing excavations
Before you pour — confirming bearing soil and footing dimensions match the approved plans and soils report.
Utility trenches & backfill
Compaction testing of trench and retaining-wall backfill that the inspector will ask about.
Concrete pours
Reinforcing inspection, concrete sampling, and test cylinders when special inspection is required.
Masonry walls
Special inspection of reinforced masonry: grout, reinforcing steel, and placement.
Paving subgrade
Subgrade and base compaction testing for driveways, parking lots, and roads.
What's included
- Field observation by qualified technicians and engineering oversight
- In-place density testing (nuclear gauge or sand cone) against laboratory maximum density
- Laboratory maximum density / optimum moisture tests on the site soils
- Concrete sampling and compressive-strength cylinder testing
- Daily field reports documenting what was observed and tested
- Final compaction and grading report, signed and stamped
- Special inspection reports and final special inspection letter for the building department
- Laboratory testing performed by [NEEDS FROM MOHAMMED: in-house laboratory or name of accredited partner lab]
- Inspector certifications: [NEEDS FROM MOHAMMED: ICC or other special-inspector certifications held]
Typical timeline
- Before work
Pre-construction setup
We review the plans, soils report, and special inspection schedule with your contractor.
- On call
Schedule a visit
Call or text to book a field visit. Notice we need: [NEEDS FROM MOHAMMED: standard scheduling notice, e.g. 24 hours].
- Every visit
Daily field report
Documented observations and test results. Typical delivery: [NEEDS FROM MOHAMMED: daily field report delivery time].
- Completion
Final report
Stamped compaction / grading report and final special inspection letter for sign-off.
Common questions
Can you do compaction testing if someone else wrote the soils report?
Often, yes — but the building department generally expects the engineer who observes grading to take responsibility for the soil recommendations, so we may need to review and accept the original report (or issue a short letter of our own). Call us with the report and we'll tell you what's needed.
Will you work with my architect, engineer, or contractor?
Yes — that's the normal way we work. We'll coordinate directly with your architect, structural or civil engineer, and contractor, send them the report in the format they need, and answer plan-check comments that relate to the soils. You stay in the loop on every email, but you don't have to be the go-between.
What areas do you serve?
We're based in Lancaster and work throughout the Antelope Valley: Lancaster, Palmdale, Rosamond, Quartz Hill, Littlerock, Lake Los Angeles, and the surrounding unincorporated areas of northern Los Angeles County. If your project is outside the valley, call us anyway — we'll tell you if we can serve it well or refer you to someone who can.
Need a technician on site?
Tell us the project address, what's being built, and when you're starting. We'll set up the inspection schedule with your contractor.