Concrete Slab Survey

What Is a Concrete Slab Survey?

A concrete slab survey in San Diego is a focused evaluation of your home's foundation slab and floor-level condition, designed to tell you whether the cracks, sticking doors, or sloping floors you're seeing point to normal settlement or to active foundation movement. Most homes across San Diego County sit on a slab-on-grade foundation, and that slab is the single most expensive component to repair if something goes wrong. A slab survey combines a documented visual assessment of the foundation, walls, and flooring with floor-elevation measurements, so you get hard numbers rather than guesswork before you buy, sell, or commit to repairs.

Unlike a quick glance during a general home inspection, a dedicated slab survey produces a measured floor-level map that can be compared against future readings, giving you a baseline to monitor change over time. It's performed by Joseph Romeo, an InterNACHI Certified Professional Inspector who also holds a California General Contractor license (CSLB #1113143) — so the findings come with real construction context, not just a checklist.

What's Included

• Floor-level (relative elevation) measurements taken throughout the accessible living area to map high and low points
• Visual assessment of the slab surface where exposed — garage, patio, and unfinished areas
• Inspection of interior and exterior walls for diagonal "stair-step" cracking, separation, and drywall stress
• Evaluation of doors and windows for racking, sticking, or out-of-square frames
• Review of foundation perimeter, stem walls, and visible cracks for width, pattern, and direction
• Assessment of site drainage, grading, and downspout discharge that drive soil moisture change
• Notes on indicators of post-tension vs. conventional (rebar) slab construction where determinable
• Identification of trip hazards, separated flooring, and cracked tile linked to slab movement
• Photo documentation of every significant finding with locations referenced to the floor-level map
• A clear, same-day digital report (typical) summarizing observations and recommended next steps

Our Process

1. Walkthrough & Visual Assessment

We start by walking the home and the perimeter, documenting crack patterns, separations, and any cosmetic clues that hint at movement. The location and direction of a crack often matters more than its width — hairline shrinkage cracks are common and benign, while diagonal cracks radiating from corners can signal differential movement worth measuring.

2. Floor-Level Measurement

Next we take relative elevation readings across the accessible floor area using leveling instruments, building a map of how much the floor rises or falls from one point to another. This is where opinions become data: a measured slope tells us whether the floor is meaningfully out of level and where the low or heaved areas are concentrated.

3. Correlation & Cause Analysis

We then connect the measurements to the visual evidence and to the site conditions — soil type, drainage, slab style, and the home's age — to form a reasoned picture of what's likely happening. Because the inspection is performed by a licensed general contractor, this step distinguishes cosmetic concerns from structural ones.

4. Reporting & Recommendations

Finally you receive a documented report with the floor-level map, annotated photos, and plain-English findings. Where movement appears active or significant, we recommend the appropriate next step, which may be evaluation by a structural or geotechnical engineer for a repair design.

Who Needs a Concrete Slab Survey?

Buyers who notice cracked tile, sloping floors, or doors that won't latch want to know what they're inheriting before closing — a slab survey turns a vague worry into a measured fact that supports negotiation or a confident purchase. Sellers use a pre-listing survey to get ahead of foundation questions and avoid last-minute renegotiation when a buyer's inspector flags movement. Real estate agents rely on the measured documentation to keep deals on track when a "the floor feels off" comment threatens to derail escrow. And current owners who've watched a crack grow, or who want a baseline before and after repair work, get the objective elevation data needed to monitor whether movement is stable or ongoing.

Concrete Slab Survey in San Diego County

San Diego's geology is the reason slab surveys matter so much here. Inland communities like Santee, El Cajon, Escondido, and parts of Poway sit on expansive clay soils that swell when wet and shrink when dry. With our Mediterranean climate — long dry stretches broken by concentrated winter rain — that soil cycles between extremes, lifting and dropping slabs and producing the classic stair-step cracks and out-of-square doors we measure for. Heaving from expansive clay can look identical to settlement to an untrained eye, which is exactly why measured data matters.

Construction style varies too. Many newer San Diego homes are built on post-tension slabs, where steel cables hold the slab in compression; these behave differently than older conventional rebar slabs and require specific care — you never cut or core a post-tension slab casually, and that distinction shapes our recommendations. Older homes from the mid-century era are more likely to have conventional slabs and aging plumbing beneath them.

Coastal areas add their own wrinkle. In La Jolla, Del Mar, Coronado, and Ocean Beach, salt-laden marine air accelerates corrosion of embedded steel and exposed fasteners, while the persistent marine layer keeps slab edges and crawl-adjacent areas damp. We factor these local realities — soil, climate, slab type, and proximity to the coast — into every survey across Carlsbad, Encinitas, Oceanside, Vista, San Marcos, Chula Vista, La Mesa, and Santee.

Pricing & Scheduling

Pricing for a concrete slab survey depends on the home's square footage, layout, and access to the slab and floor areas — see our fee schedule for current rates, or request a quote tailored to your property. Same-day digital reports are typical, so you're not left waiting during a time-sensitive escrow. To book a survey or ask a question, call (619) 752-4399 or email joe@sandiegohomeinspection.com, and you can review our sample reports to see exactly what you'll receive.

Frequently Asked Questions

Is a concrete slab survey the same as a structural engineering report?

No. A slab survey is a measured inspection that documents floor level and the condition of the foundation, flooring, and walls, and tells you whether further evaluation is warranted. If we find evidence of significant or active movement, we'll recommend a licensed structural or geotechnical engineer to design any repair — the survey is the fact-finding step that comes first.

How much floor slope is considered a problem?

There's no single magic number, because the cause and pattern matter as much as the amount. A gradual, uniform tilt is interpreted very differently than a sharp localized dip or heave. Our report gives you the actual measurements and our reasoned interpretation so you can make an informed decision rather than relying on a rule of thumb.

Are foundation cracks always serious?

Not at all. Many cracks are cosmetic shrinkage that occurs as concrete cures and is extremely common in San Diego. What we look for is the combination — crack direction and location paired with measured floor slope and door/window distortion — that distinguishes harmless cracking from movement worth addressing.

Can you tell if my home has a post-tension slab?

Often, yes. Post-tension slabs usually carry warning placards at the garage or perimeter, and there are other construction clues we look for. Knowing the slab type is important because post-tension slabs must never be cut or drilled without locating the cables first, and that affects any repair or remodel recommendation we make.

Schedule Your San Diego Concrete Slab Survey