Aging Infrastructure in Older Cabo Developments: What 15-to-20-Year-Old Buildings Really Cost Buyers

The Aging Wave Is Here

Between 2005 and 2012, Los Cabos experienced its first major construction boom. Thousands of condos, villas, and hotel-condo units were built across Cabo San Lucas, the Corridor, and San Jose del Cabo. Many of these buildings are now 15–20 years old — the age when infrastructure problems stop being theoretical and start being expensive.

I am not writing this to scare anyone away from resale property. Some of the best values in Los Cabos right now are well-maintained buildings from this era — they are in established communities with mature landscaping, proven HOAs, and no construction-phase uncertainty. But "well-maintained" is the operative phrase. A 17-year-old building where the HOA skimped on preventive maintenance for a decade is a very different proposition from one where the reserve fund is healthy and the systems have been properly serviced.

The difference between these two scenarios can be $30,000–$80,000 in unexpected costs within the first five years of ownership. Here is how to tell them apart before you buy.

Key Takeaways

• Critical age range: Buildings from 2005–2012 are now hitting the 15–20 year infrastructure replacement window — expect plumbing, electrical, and waterproofing issues
• Plumbing: Galvanized steel pipes (common in pre-2010 construction) corrode internally in Cabo's mineralized water; re-piping a condo unit costs $8,000–$25,000
• Electrical: Panel upgrades, corroded connections from salt air, and undersized wiring for modern loads cost $5,000–$15,000 per unit
• Waterproofing: Roof membranes and exterior waterproofing in Cabo's climate need replacement every 8–12 years; failure causes structural damage that costs $15,000–$50,000
• HOA reserves: Ask for the reserve fund study before you buy — a healthy reserve fund is the single best indicator that a building has been maintained properly

Plumbing: The Silent Corroder

The most common infrastructure problem in older Cabo buildings is plumbing corrosion. Cabo's water is highly mineralized — whether it comes from wells, the municipal system, or even desalination plants (which produce clean water, but the distribution pipes still carry mineral deposits). This mineralization accelerates corrosion in metal pipes.

Galvanized Steel Pipes

Buildings constructed before 2010 frequently used galvanized steel for supply lines. These pipes have an effective lifespan of 15–25 years in Cabo's water conditions. At year 15, internal corrosion begins to restrict water flow — you will notice reduced pressure, rust-colored water when a faucet first opens, and eventually pinhole leaks.

Re-piping a two-bedroom condo unit from galvanized to CPVC or PEX typically costs $8,000–$15,000. A three-bedroom villa: $15,000–$25,000. If the building's common risers (vertical supply lines) also need replacement, the HOA faces a major capital expense — $50,000–$200,000 depending on the building's size.

Drain Lines and Sewer

Cast iron drain lines, common in pre-2008 construction, corrode from the inside out in humid environments. Symptoms include slow drains, gurgling sounds, and sewage odors. Camera inspection of drain lines costs $300–$500 and should be part of every resale inspection for buildings older than 12 years.

Electrical Systems

Cabo's salt air environment is brutal on electrical connections. Copper wire itself holds up well, but connection points — panel breakers, junction boxes, outlets, and especially exterior fixtures — corrode over time. The symptoms are intermittent: tripped breakers, flickering lights, outlets that work sometimes.

Panel Upgrades

Many buildings from this era were wired for the electrical loads of 2008 — before every home had multiple air conditioning zones running simultaneously, electric vehicle chargers, and a home full of electronics. Panel upgrades from 100-amp to 200-amp service cost $3,000–$5,000 per unit. If the building's main electrical service needs upgrading, the HOA and CFE (the federal electricity commission) face a coordination challenge that can take 6–18 months.

Salt Air Damage

Beachfront and near-beach properties experience the worst electrical corrosion. I have seen electrical panels in oceanfront condos where every breaker connection showed green corrosion — the panel was functioning but was a fire risk. A full electrical inspection by a licensed electrician (ingeniería eléctrica) costs $500–$800 and is essential for any oceanfront building older than 10 years.

Waterproofing and Structural Envelope

Waterproofing failure is the most expensive infrastructure problem because it causes cascading damage — water intrusion leads to rebar corrosion in concrete, which leads to spalling, which leads to structural concerns. In Cabo's climate (intense sun, concentrated rainy season, salt air), waterproofing membranes have a lifespan of 8–12 years on flat roofs and terraces.

Roof Membranes

Flat concrete roofs — the standard construction in Cabo — require waterproofing membranes that deteriorate under UV exposure. A building that was waterproofed once at construction and never re-coated is guaranteed to have leaks by year 12. Re-waterproofing a roof costs $8–$15 per square foot. For a 1,500-square-foot condo roof, that is $12,000–$22,500.

Concrete Spalling

When waterproofing fails and water reaches the reinforcing steel (rebar) inside concrete, the rebar corrodes and expands, cracking the concrete from inside — a process called spalling. You can see it: chunks of concrete falling away from balcony edges, exposed rusty rebar on building facades, cracks following the grid pattern of the internal reinforcement.

Spalling repair is expensive — $15,000–$50,000 depending on the extent. It requires removing deteriorated concrete, treating or replacing corroded rebar, and patching with structural repair materials. If multiple units in a building show spalling, the HOA faces a major assessment.

The HOA Reserve Fund: Your Crystal Ball

The single best predictor of a building's true condition is the health of its HOA reserve fund. A well-run HOA with a funded reserve study has been saving for these infrastructure replacements for years. When the plumbing needs re-piping, the money is there. When the roof needs re-waterproofing, the money is there. No special assessment. No surprise.

A poorly run HOA — one that kept monthly fees low by not funding reserves — will hit owners with special assessments of $10,000–$30,000 per unit when infrastructure fails. And it will fail. The question is not if but when.

What to Ask Before Buying in an Older Building

• Does the HOA have a current reserve fund study? (Not just a bank balance — a study by an engineer that identifies future capital needs and their estimated costs)
• What is the current reserve fund balance, and what percentage of the study's recommended balance does it represent? (80%+ is healthy; under 50% is a warning)
• Have there been any special assessments in the last five years? For what?
• When were the roofs last waterproofed? What about common-area plumbing and electrical?
• Is there a scheduled maintenance calendar for major building systems?

If the HOA cannot answer these questions, that is your answer. Walk.

When Older Buildings Are Actually Better

I do not want to leave the impression that older buildings are always risky. Some of the best-value purchases I have brokered in Los Cabos have been in 15–20-year-old buildings with excellent maintenance histories. These buildings offer:

• Established communities with mature landscaping, proven HOA governance, and known neighbor dynamics
• No construction-phase risk — the building exists, the finishes are visible, and you can inspect every system before buying
• Price discounts of 15–30% below comparable new construction, because buyers irrationally prefer shiny over proven
• Location advantages — many older buildings occupy prime locations that are no longer available for new development

The key is due diligence. A $2,000 comprehensive inspection by an engineer who knows Cabo construction is the best money you will spend in any resale transaction. I can recommend several.