A multifamily inspection in San Diego documents the physical condition of an income property before you close: a representative sample of units, all common areas, the roofs, and the major mechanical, electrical and plumbing (MEP) systems. For buildings with three or more units, it also flags SB-721 balcony compliance and helps you budget capital reserves so deferred maintenance does not become your problem on day one.
Why a multifamily building is a different inspection than a house
When you buy a single-family home, the inspector walks one structure, one roof, one electrical panel and one set of plumbing. An apartment building multiplies all of that. A 12-unit complex might have three roof sections of different ages, two or three subpanels, a shared water heater plant, a parking structure, and a dozen kitchens and bathrooms that have each aged at their own pace under different tenants.
That scale is exactly why investors order a property condition assessment (PCA) rather than treating the deal like a house purchase. A PCA is a commercial-grade inspection built around the systems and life-cycle costs that drive an income property’s net operating income. It is the foundation of your due-diligence period, and on larger or older buildings it is often the single most useful number you will get before your contingencies expire. You can see how this works on our commercial building inspections page, and our deeper write-up on the commercial property condition assessment walks through the full report structure.
What a multifamily inspection actually covers
Unit sampling, not every unit
Inspecting all 40 units of a building during a typical due-diligence window is rarely practical or necessary, and access is limited by occupied tenants and California notice requirements. Instead, a multifamily inspection uses a representative sample – commonly a percentage of units across each floor plan type, vacant units, and any units the seller or property manager flags. The goal is to characterize the building’s general condition and catch patterns: if three sampled units all show the same corroded angle-stops or the same failing wall heater, you can reasonably assume the rest are similar.
Ask early how units will be accessed. Coordinating tenant notice through the seller’s property manager is usually the slowest part of the process, so it should be arranged the moment your offer is accepted.
Common areas and site
Common areas are where a lot of multifamily liability lives: stairwells, walkways, handrails and guardrails, laundry rooms, mailbox clusters, pool and spa enclosures, landscaping and drainage. Parking is part of the picture too – asphalt condition, carport structures, and any subterranean or podium garage. Trip hazards and inadequate guardrails are common findings and they matter both for tenant safety and for your insurer.
Roofs
Roofing is one of the largest line items on any apartment building, and multi-section roofs of mixed ages are the norm. The inspection notes membrane or shingle type, apparent age, ponding, flashing condition and visible leaks so you can estimate remaining service life. If the roof is near the end of its life, that is a six-figure reserve item on a large building and a legitimate negotiating point. Our roof inspection service can be folded into the broader assessment.
MEP – mechanical, electrical and plumbing
The MEP systems determine both safety and the size of your future repair budget:
- Electrical: main service capacity, condition of panels and subpanels, and known problem equipment. Older San Diego apartment stock can still have outdated panels or aluminum branch wiring worth investigating.
- Plumbing: supply piping material (galvanized steel is a red flag for age and corrosion), water heater configuration and age, and drain performance. For older buildings, sewer laterals are a hidden risk – a sewer scope on the main line can reveal root intrusion or collapsed clay pipe before you own it.
- Mechanical: heating and any cooling equipment per unit, ventilation, and shared systems.
Thermal imaging is a useful add-on here. In coastal buildings especially, infrared scanning can reveal moisture intrusion behind walls and around windows that a visual-only inspection would miss – see our thermal imaging service for how that pairs with a multifamily walk-through.
SB-721 balcony compliance for buildings with 3+ units
This is the item most likely to surprise a new multifamily buyer in California, so understand it before you write the offer. SB-721 (Health & Safety Code 17973) requires inspection of exterior elevated elements – balconies, decks, stairways, walkways and their railings – on buildings with three or more multifamily dwelling units. The original statute set a January 1, 2025 deadline, but AB 2579 extended the first-inspection deadline to January 1, 2026. After that, these elements must be re-inspected every six years.
What this means in a purchase: if the building you are buying has not had its SB-721 inspection, that obligation transfers to you as the new owner, along with the cost of any repairs the inspection identifies. During due diligence you should ask the seller for proof of a completed SB-721 inspection and any associated repair records. If none exists, factor both the inspection and potential structural repairs into your numbers. Our dedicated SB-721 balcony inspection service handles this, and the SB-721 compliance checklist for San Diego apartments lays out exactly what is required and how to document it.
A quick distinction so you target the right law: SB-721 covers apartment buildings of 3+ units, while SB-326 (Civil Code 5551) covers condominium and HOA-governed properties on a separate schedule. If your deal is a condo conversion or HOA-controlled building, the rules differ – our guide comparing the two laws explains which applies.
Capital reserves: turning the inspection into a budget
A good multifamily inspection does not just produce a punch list – it feeds your capital reserve planning. Every major system has a remaining useful life, and the assessment lets you assign rough timelines and costs to the big-ticket items: roofs, water heaters, repiping, electrical upgrades, parking-lot resurfacing, and balcony repairs under SB-721.
From there you can build a reserve schedule that spreads those costs over the years you expect to hold the building, rather than getting hit with an unbudgeted roof replacement in year two. Lenders on commercial multifamily loans frequently require a reserve study or PCA anyway, so this work often does double duty for your financing. The practical move is to treat the inspector’s remaining-life estimates as the skeleton of a 10- or 20-year reserve plan, then refine the dollar figures with contractor bids on the items closest to failure.
A few San Diego-specific realities
Coastal corrosion is real here. Buildings in Oceanside, Carlsbad, Encinitas and the beach communities show accelerated rusting on railings, fasteners, electrical equipment and balcony framing – which intersects directly with SB-721 findings. Inland in Escondido, El Cajon and Santee, expansive clay soils and summer heat stress foundations, slabs and HVAC instead. Older multifamily stock across the county is more likely to carry galvanized plumbing, dated electrical and original roofs. If your building is in a coastal city, our Oceanside inspection page describes the corrosion patterns we look for.
Before you remove your inspection contingency
Order the assessment early in your due-diligence period, push for unit access through the property manager immediately, demand SB-721 documentation for any 3+ unit building, and turn the remaining-life findings into a real reserve budget before you waive contingencies. Done right, a multifamily inspection is not a hurdle – it is the clearest picture you will get of what you are actually buying and what it will cost to own.
Buying or evaluating an apartment building in San Diego County? Joseph Romeo, InterNACHI Certified Professional Inspector and CSLB-licensed General Contractor (#1113143), handles commercial and multifamily assessments across the county. Call (619) 752-4399 or contact us to scope your inspection. Pricing depends on unit count, building age and access – see our fee schedule for how we quote.
