Underpinning Inspections in PhiladelphiaStrucTech Structural Engineers
Adjacent excavation. Stamped & signed.
StrucTech is a Philadelphia structural engineering firm led by Jim Clancy, PE #42340. Underpinning inspections for basement deepening, party-wall protection, and adjacent excavation. We coordinate with your GC, the adjacent owner, and L&I to keep work moving.
Scope of work
Digging next to somebody else's building is the highest-risk thing most Philadelphia projects do. New foundations go deeper than the neighbor's, party walls sit on rubble stone with almost no footing, and the excavation removes the soil that has been holding everything in place for a century. Underpinning is how that gets handled, and it only works if the sequence is followed and the work is observed while it is open.
We start before excavation. A pre-construction survey documents the adjacent property with photographs and notes on existing cracks, settlement, and prior repairs. That record protects everyone. Without it, every crack in the neighbor's plaster becomes your crack. We review the underpinning design and the pin sequence with the contractor so nobody improvises in the field.
During the work we inspect each pit before it is poured. Bearing material gets checked, depth and width get verified against the design, the excavation gets confirmed as within the approved sequence, and dry-packing at the top of each pin gets observed. Skipped or over-wide pits are the common failure, and they are the reason walls move. We stop those on the spot rather than writing them up later.
Adjacent conditions get monitored as the job progresses. If movement shows up, you hear about it while there is still time to respond. At completion we issue a signed and sealed letter confirming the underpinning was installed and inspected in accordance with the approved drawings, which is what L&I, the adjacent owner, and your insurer all want to see.
Have an excavation coming up next to an occupied building? Call (267) 310-1172 or send the foundation plans through the contact form and we will get the pre-construction survey scheduled before the machine shows up.
- Pre-pour pin checks
- Sequence verification
- Adjacent property monitoring
- Party-wall conditions
- Stamped sign-off letters
Underpinning Inspections across Philadelphia neighborhoods
How It Works
Simple, fast, on-record.
Call or Request
Reach a real engineer — same day for emergencies.
Site Assessment
On-site inspection, photos, and condition documentation.
Stamped Report
PE-sealed letter or report formatted for L&I submission.
Permit Cleared
We support the permit through pickup and re-inspection.
Underpinning Inspections questions
When does a Philadelphia project need an underpinning inspection?
Any time excavation goes below or right next to an adjacent foundation. Basement deepening, new footings on the property line, and rear additions beside a party wall are the usual triggers. On the homepage this is the Underpinning Sign-Off card.
Why should the neighbor's building be surveyed before digging starts?
A pre-construction survey records existing cracks, settlement, and old repairs with dated photos. If the neighbor later claims damage, that record shows what was already there. Skip it and every crack in their plaster becomes your problem.
Does each underpinning pin need to be inspected before it is poured?
Yes. We observe the bearing soil and pit dimensions at each pin and confirm the pour sequence matches the approved design. Once a pit is filled, there is nothing left to inspect.
What paperwork does L&I get for underpinning work?
A stamped Structural Engineering Report that summarizes the survey, the pin-by-pin inspections, and our conclusion on whether the work followed the approved plan. Where the design itself is missing or needs revision, we can prepare Structural Plans/Drawings too.
Permit on hold? Structure unsafe? Don't wait.
Get In Touch
Request an Engineer
Tell us about the project. We'll reach back fast — same day for active permits and emergencies.
Or call us directly: (267) 310-1172