10 Most Expensive Home Repairs

1. 01

   Foundation issues

   The foundation is what everything else sits on, so when it moves, the whole house gets involved. Repairs usually begin with an engineered assessment, then excavation, underpinning or piers, and they can touch the entire perimeter of the home. In Las Vegas, many homes sit on slab-on-grade foundations over expansive clay soils that swell and shrink with moisture, which is why drainage and watering near the foundation get so much attention here. Even a localized repair involves heavy equipment, specialized contractors, engineering reports and permits, and the problem underground is often bigger than it looks on the surface. A few hairline cracks can be cosmetic. Diagonal or stair-step cracks, doors that stick, and floors that slope are the kinds of signs an inspector and an appraiser both take seriously.

2. 02

   Roof replacement

   The roof is a large surface with many layers, and replacement means removing what is there, repairing or replacing the decking underneath, installing underlayment, flashing and new material, and doing it all to current code. In the Las Vegas Valley, building codes include wind ratings for this region, so materials and installation methods are often specified more strictly than in other parts of the country. And the desert sun is hard on roofing: years of heat and UV degrade materials in ways buyers from milder climates do not expect. Add roof pitch, a two-story home and disposal of the old layers, and it is easy to see why the labor and material bill climbs. The reassuring part: a roof shows its age, and a careful inspector can usually tell you how much is genuinely left in it.

3. 03

   Structural or bearing-wall problems

   The structure is the house's skeleton, and repairing or removing a bearing wall, one that carries the load of the floor or roof above it, is not a drywall job. It means engineering, temporary support, a properly sized beam, permits and inspections. The cost runs high because you cannot see a home's load path just by looking at it. When a previous owner opened up a wall without the right structure behind it, the problem stays hidden until something settles, cracks or sags. That is why a history of unpermitted remodels can turn into expensive corrections later. This is also where an experienced inspector, and a healthy amount of curiosity about a home's past, earn their keep before you commit.

4. 04

   Water heaters, including tankless

   A water heater is a hardworking appliance, and replacing one properly costs more than the sticker on the tank. You pay for the unit, the labor, the plumbing connections, often new venting, gas line or electrical work when the type changes, a permit, and hauling the old unit away. Tankless models are efficient, but they usually cost more up front than a tank, and they need correct sizing and adequate fuel supply to actually deliver. Where the unit lives matters too: some Las Vegas homes put them in attics or garages, where access, strapping, ventilation and drainage all add to the job. An inspection typically reports the age of the unit, and age is the most honest predictor of when replacement is coming.

5. 05

   HVAC: heating and cooling

   Air conditioning in Las Vegas is not a comfort feature. It is what makes a home livable, and the system runs for much of the year, which means it works harder and ages faster here than in most markets. Replacement involves the indoor unit, the outdoor condenser, the refrigerant line set, often ductwork improvements, permits and installation by licensed professionals. Older systems may also run on refrigerants that are being phased out, which makes repairs costlier over time and can push replacement sooner. Because the stakes are so high, I always ask about the age and condition of the HVAC before a buyer makes an offer. A unit near the end of its life is not a dealbreaker, but it is a number that belongs in the negotiation.

6. 06

   Electrical panel and wiring

   The electrical system is governed by code for a reason, and the panel is its most important piece. Older panels, fuses or wiring types that are no longer standard can be unsafe, can fail an inspection, and can be expensive to bring up to current requirements. Upgrading a panel means coordinating with the utility and having a licensed electrician rework the service, which is specialized, permitted work. And wiring is hidden: replacing obsolete wiring inside finished walls means opening up the house, which multiplies the bill. It is also a resale issue, because buyers, insurers and appraisers all notice an electrical system that looks dated or visibly overloaded. A qualified inspector can flag these concerns during the inspection period, which is exactly when you want to know about them.

7. 07

   Plumbing, especially slab issues

   Las Vegas is a slab-on-grade town, and when a supply line under the slab leaks, the fix is not a simple pipe repair. It takes locating the leak, cutting into the slab, rerouting or replacing the line, patching the concrete, and often repairing the floors, drywall and cabinets that the water damaged along the way. Older homes may have piping materials that are no longer used, which means the prudent fix is often replacing a whole run instead of patching one spot. Water damage spreads quietly, behind walls and under floors, so the visible repair cost is only part of the bill. The clues, such as a water heater that cycles constantly, unexplained damp spots, or a water bill that climbs for no clear reason, are things a good inspector looks for and a smart buyer asks about.

8. 08

   Sewer line and drainage

   The sewer line carries waste from the house to the street or the community system, and almost all of it is buried, under the yard or the driveway. Roots, shifting soil, blockages and age all take a toll, and the repair usually means trenching out part of the yard or lining the pipe from the inside, a specialized job with its own equipment and permits. Unlike most repairs, you generally cannot see the problem until it announces itself, which is why I like a camera inspection of the sewer line as part of due diligence on older homes. Drainage matters just as much above ground: how water moves away from the structure and the lot determines how much of it ends up testing the foundation, the slab and the landscaping.

9. 09

   Mold and water damage remediation

   Mold remediation is expensive for a simple reason: it is not just removing what you can see. It is finding and fixing the moisture source, removing the affected materials properly, drying the whole assembly, and preventing recurrence. Roof leaks, plumbing leaks, poor ventilation and the occasional monsoon rain in Las Vegas can all create the conditions. The work is specialized, containment and testing add cost, and if moisture caused structural or finish damage, you pay for that repair on top of the remediation. Insurance language around mold and water varies from policy to policy, so never assume coverage; read the policy and ask. The defensive play is prevention and early detection, which is what inspections, steady maintenance and knowing a home's weak points are for.

10. 10

    Major appliances and exterior upgrades: windows and siding

    Windows and siding are big-surface items, and big surface means big material and labor bills. Replacing windows means removing and reinstalling the full perimeter, with custom sizing, weatherproofing and energy performance that matters in a desert climate. Siding replacement covers the whole exterior, often includes repairing the sheathing underneath, and means matching or updating the look of the facade. Major appliances such as a range, dishwasher or water heater can also cost more than their sticker price once installation, venting and hookups are included. None of these are emergencies the way a slab leak is, but they are large, predictable costs, and a home's age and condition tell you they are coming.

Notice what all ten have in common: the cost comes from labor, materials and hidden damage, rarely from the part itself, and the price is different for every home. That is why you will not find dollar figures here. What you will find is a map: the systems to ask about, the signs to look for, and the questions to bring to the inspection.