Last updated October 17, 2026
The items that cost the most are the easiest to miss during a showing. Here are the real cost ranges for St. Louis's most common major repair issues -- what buyers need to know before they offer.
These are also the costs that catch buyers off guard after closing. Understanding them before you make an offer is the difference between a good deal and a regret. See the full breakdown of what buyers regret most after buying a cheap house in St. Louis.
2026 expected costs in St. Louis. You still need quotes from licensed contractors for your house, but a range is a great place to start a budget.
The 2026 expected cost of an asphalt roof replacement is about $8,000 to $20,000, with larger homes and steeper pitches at the top of that range. Major repair cost table ↓ Flag it in the walk-through tool →
The 2026 expected cost of a full system, furnace plus AC condenser, is $7,000 to $15,000. A furnace alone runs about $3,000 to $6,000 and an AC condenser $3,500 to $6,000. At 12 years or older, factor replacement into your offer. Major repair cost table ↓ Flag it in the walk-through tool →
The 2026 expected cost of replacement is typically $4,000 to $12,000, depending on the depth and length of the line, and it can exceed $15,000 in some cases. A camera scope to check it first runs $150 to $300. Major repair cost table ↓ Flag it in the walk-through tool →
The 2026 expected cost of an interior drain and sump pump system is $5,000 to $12,000. Exterior waterproofing, which requires excavation, runs $15,000 to $25,000 or more; St. Louis clay soil is a common driver. Major repair cost table ↓ Flag it in the walk-through tool →
The 2026 expected cost of minor repairs such as crack injection or pier stabilization is $3,000 to $8,000. Major repairs for horizontal cracks or significant lateral movement run $15,000 to $40,000 or more. Major repair cost table ↓ Flag it in the walk-through tool →
You walk into a house. The kitchen was updated. The floors are refinished. My eyes go to the ceiling in the basement, the age of the HVAC unit, the condition of the mortar between the bricks on the exterior. Most buyers' eyes go to the kitchen.
This is not a criticism -- it is how humans process spaces. But it means the most expensive problems in a St. Louis home are systematically overlooked during showings, and buyers discover them after they are under contract -- when the discovery costs them either renegotiation leverage or the repair itself.
| Item | Typical Range | Notes |
|---|---|---|
| Roof replacement (asphalt) | $8,000 -- $20,000 | Larger homes and steeper pitches at top end |
| Full HVAC system | $7,000 -- $15,000 | Furnace + AC condenser. Furnace alone: $3,000--$6,000 |
| AC condenser only | $3,500 -- $6,000 | At 12+ years, factor replacement into offer |
| Basement waterproofing (interior) | $5,000 -- $12,000 | Interior drain + sump pump system |
| Basement waterproofing (exterior) | $15,000 -- $25,000+ | Excavation required; St. Louis clay soil common driver |
| Sewer lateral replacement | $4,000 -- $12,000 | Depth and length determine cost; can exceed $15,000 in some cases; camera scope: $150--$300 |
| Tuckpointing (full house) | $5,000 -- $15,000 | Single facade: $1,500--$4,000 |
| Electrical panel replacement | $2,000 -- $4,000 | Federal Pacific/Zinsco panels require replacement |
| Full rewire (older home) | $8,000 -- $15,000+ | Knob-and-tube or aluminum branch circuit |
| Foundation repair (minor) | $3,000 -- $8,000 | Crack injection, pier stabilization |
| Foundation repair (major) | $15,000 -- $40,000+ | Horizontal cracks, significant lateral movement |
| Water heater replacement | $900 -- $1,800 | Tank unit installed; tankless runs higher |
| Radon mitigation | $800 -- $1,500 | Missouri has elevated radon in many areas |
| Sewer scope (camera inspection) | $150 -- $300 | Add to every home inspection |
In St. Louis, the age of a home is one of the strongest predictors of what you will find. Here is how to think about risk by decade of construction:
Expect original clay tile sewer laterals, knob-and-tube wiring that may still be active in walls or attic, cast iron drain stacks throughout, and plaster walls. Tuckpointing on brick construction is almost certainly needed at some level. These homes are not un-buyable -- many are structurally excellent -- but your inspection budget should be higher and your offer strategy should account for deferred system costs.
This is the Federal Pacific and Zinsco panel era. Galvanized steel supply lines that restrict pressure and corrode internally are common. Aluminum branch circuit wiring appears in homes from the mid-1960s through the 1970s. Sewer laterals are still original clay tile in most cases. HVAC systems installed in these homes -- even if updated once -- are often approaching end of life again.
Generally safer electrical, but sewer laterals are still a concern. Original HVAC systems from this era are well past service life. Roof materials from the 1980s need evaluation. Basement waterproofing systems -- if any were installed -- are aging.
Electrical and plumbing are typically updated. HVAC systems are reaching or past the 20-year mark and should be evaluated carefully. Chinese drywall was used in some construction from this era (2004-2007 specifically) and caused documented corrosion problems -- worth confirming if the home falls in this window.
After 13 years of being present at inspections on hundreds of St. Louis homes, the items that come up most frequently on inspection reports are: deferred tuckpointing on brick homes, aging HVAC equipment, sewer lateral defects (on scope), basement water management issues, and Federal Pacific or Zinsco panels. These are not rare edge cases -- they are the St. Louis baseline.
The difference between a buyer who gets hurt by these findings and one who navigates them well is almost entirely about preparation. Knowing these costs going in means you are negotiating from knowledge, not reacting from surprise.
Beyond the big-ticket items, these smaller repairs come up frequently on St. Louis home inspections and can accumulate into a significant total:
| Item | Typical Range |
|---|---|
| Sewer scope (camera inspection) | $150 -- $300 |
| Radon mitigation system | $800 -- $1,500 |
| Chimney inspection and cleaning | $200 -- $400 |
| Water heater replacement | $900 -- $1,800 |
| Grading and drainage correction | $500 -- $3,000 |
| Gutter repair / replacement | $400 -- $1,500 |
| Sump pump replacement | $600 -- $1,200 |
| Window seal failures (fogged glass) | $150 -- $300 per window |
| Attic insulation upgrade | $1,500 -- $3,500 |
| GFCI outlet updates | $200 -- $600 |
Individual repair items that seem manageable add up quickly. A home with a 14-year-old HVAC ($10,000 replacement budget), a sewer lateral with root intrusion ($6,000 repair), failed tuckpointing on the south facade ($3,500), and a 19-year-old water heater ($1,200) has $20,700 in near-term costs -- even though none of these is a catastrophic finding. Understanding the cumulative picture is how you build a legitimate negotiation position rather than reacting to a single line item in the inspection report.
What to look for room by room during a showing -- before you are under contract. Walkthrough Checklist: What to Look For When Buying a House in St. Louis → →During every showing I walk, I evaluate the approximate remaining life of the major systems and flag visible deferred maintenance. That information goes into your offer strategy -- not as a reason to walk away, but as a basis for accurate pricing.
A home that needs a new roof and HVAC in the near term is not worth the same as one with systems replaced two years ago, regardless of list price. The math is simple: identify what needs to be addressed, get realistic cost estimates, and reflect that in what you offer.
How to turn repair estimates into a defensible offer number. How Repair Costs Should Affect Your Offer Price in St. Louis → → Real case study: $30K off before inspections even started. The $30K Case Study → →Touring before you make an offer? Flag issues as you walk with my walk-through tool and watch the 2026 expected repair costs add up. Save or email your results to compare houses and bring real numbers to the offer.
Older homes
The 2026 expected cost of full-house tuckpointing is $5,000 to $15,000. A single facade runs about $1,500 to $4,000. Major repair cost table ↓ Flag it in the walk-through tool →
The 2026 expected cost of a panel replacement is $2,000 to $4,000; Federal Pacific and Zinsco panels need replacement. A full rewire of an older home with knob-and-tube or aluminum branch circuits runs $8,000 to $15,000 or more. Major repair cost table ↓ Flag it in the walk-through tool →
The 2026 expected cost of an installed tank water heater is $900 to $1,800; tankless units run higher. Smaller common repairs ↓ Flag it in the walk-through tool →
The 2026 expected cost of a radon mitigation system is $800 to $1,500. Missouri has elevated radon in many areas. Smaller common repairs ↓
Deferred tuckpointing on brick homes, aging HVAC equipment, sewer lateral defects found on a scope, basement water management issues, and Federal Pacific or Zinsco panels. They aren’t rare edge cases; they’re the St. Louis baseline. What inspectors flag ↓
Original clay tile sewer laterals, knob-and-tube wiring that may still be active, cast iron drain stacks and plaster walls, and tuckpointing is almost certainly needed at some level. Many are structurally excellent, but budget more for the inspection and deferred systems. Risk by age of home ↓
This is the Federal Pacific and Zinsco panel era. Expect galvanized supply lines, aluminum branch wiring from the mid-1960s, original clay tile sewer laterals and HVAC systems that are often nearing the end of their life again. Risk by age of home ↓
Quickly. A 14-year-old HVAC system ($10,000 budget), a sewer lateral with root intrusion ($6,000), failed tuckpointing on one facade ($3,500) and a 19-year-old water heater ($1,200) total $20,700 in near-term costs, and none of them is catastrophic. The cumulative effect ↓
Inspections and offers
About $600 to $1,050 for all three: a standard home inspection runs $350 to $600, a sewer scope $150 to $300 and a radon test $100 to $150. Budget for all three on every St. Louis home.
Federal Pacific Electric Stab-Lok panels were installed in millions of homes between the 1950s and 1980s. Their breakers have been shown to fail to trip under overload conditions, creating fire risk. They appear frequently in St. Louis homes from that era. Replacement typically runs $2,000 to $4,000 and is required by most insurance carriers. Identify the panel brand before you make an offer. Flag it in the walk-through tool →
Yes, without question. Get one on every St. Louis home, whatever its age, as part of your due diligence. Clay tile sewer laterals are standard in St. Louis homes built before 1980, and lateral failure is one of the most common post-closing surprises. A camera scope runs $150 to $300. If the lateral shows cracks, offsets, or root intrusion, replacement typically runs $4,000 to $12,000 and can exceed $15,000 in some cases -- a significant negotiating point or reason to walk. Flag it in the walk-through tool →
Focus your inspection objection on the material items -- the expensive, the safety-related, and the systemic. A seller presented with a 40-item list covering every maintenance note will react defensively. A seller presented with three items supported by contractor estimates has a much harder time refusing. Get estimates, calculate the midpoint, and ask for either the repair or a price reduction that reflects the cost.
This is one piece of the St. Louis home buying process. See how it all fits together:
📚 Complete St. Louis Buyer Guide →
Grew up in South St. Louis, lived in Dogtown for 6 years, now in South County. You'll find us at Wellspring on Lindbergh on Sundays. I'm not selling you a house — I'm showing you how to think about buying or selling a house.