Case Study: Lindon — Basement Mother-in-Law Apartment Toilet Supply Failure

Property: 1998 two-story home with basement mother-in-law apartment, north Lindon, Utah County
Square Footage: Primary residence 2,680 sq ft; basement MIL apartment 1,150 sq ft (separate entrance, kitchen, bath, bedroom, living area)
Loss Date: February 12, 2024 — 3:15 PM (MIL apartment tenant home; discovered within 10 minutes)
Loss Category: IICRC S500 Category 1 (clean water)
Loss Class: Class 2 (contained to MIL apartment with modest primary residence involvement)
Response Time: 43 minutes from dispatch confirmation to on-site arrival
Total Restoration Timeline: 23 days from initial response to full occupancy
Insurance Carriers: Farmers HO-3 (homeowner primary policy covering entire structure); no renters policy for MIL tenant
Final Xactimate Scope: $28,940

The Loss Event

The homeowners rented their basement mother-in-law apartment to a family member (elderly parent) as an ongoing arrangement. Rental included utilities but no separate lease agreement — a common family arrangement in Utah County. Insurance was through the homeowner’s standard HO-3 policy without specific rental endorsement (the family relationship and the informal nature of the arrangement placed the MIL apartment under the homeowner’s own coverage rather than requiring a landlord-specific policy).

The MIL apartment’s bathroom toilet supply line — a braided stainless flex hose connecting the wall shutoff to the toilet fill valve — failed at the wall shutoff connection at approximately 3:15 PM on February 12, 2024. The failure produced full open flow at approximately 3 GPM. The tenant (elderly parent) was in the apartment at the time and heard the water, but her mobility limitations meant it took approximately 8 minutes to reach the bathroom and additional time to identify the shutoff. She called the homeowners upstairs, who came down and closed the main water shutoff at the mechanical closet within 12 minutes total elapsed time.

Total water release: approximately 40 gallons over the 12-minute duration. The bathroom floor was fully wet; water had migrated into the adjacent hallway and edge of the living area. Standing water depth in the affected areas ranged from 1/4 inch (hallway) to 3/4 inch (bathroom immediately around toilet).

Emergency call to our line at 3:34 PM.

Diagnostic Sequence

Arrival at 4:17 PM (43 minutes after dispatch). MIL apartment assessment:

Bathroom (source area)

Vinyl floor with subfloor wet across full 55 sq ft. Wall base plates wet on three walls (approximately 22 linear feet total). Vanity cabinet base wet.

Hallway (adjacent)

Carpet fully saturated across 85 sq ft. Pad beneath saturated.

Living area edge

Carpet wet across approximately 40 sq ft at the hallway transition. Diminishing moisture toward the interior of the room.

Ceiling above bathroom (primary residence bathroom above)

Primary residence bathroom is directly above MIL bathroom; the source event was in the lower unit, so no ceiling damage in the primary residence from this event.

Failed supply hose

10-year-old braided stainless flex hose documented and retained for insurance reference. Standard installation-age failure.

Family Rental Coverage Framework

The homeowner’s HO-3 policy covered the entire structure (primary residence and basement MIL apartment) as a single insured property. The MIL tenant (family member) did not carry separate renters insurance — a common gap in family rental arrangements. Practical implications:

• Structural damage across both areas: covered under homeowner’s HO-3
• Homeowner’s personal property (in primary residence upstairs): covered under homeowner’s HO-3 personal property coverage
• MIL tenant’s personal property (in basement apartment): NOT covered by homeowner’s HO-3 (that’s tenant contents, not owner contents), NOT covered by renters policy (didn’t have one)

The MIL tenant faced modest out-of-pocket loss for personal property affected — some clothing, a rug, some bathroom items. The homeowners voluntarily covered these tenant contents costs as part of family accommodation ($1,200 estimated). This is not a restoration scope element but noted here for the broader context.

Equipment Deployment

Truck-mounted extraction unit

Removed approximately 35 gallons of standing water from bathroom, hallway, and living area edge over 90 minutes.

Carpet pad removal

Saturated carpet pad removed from hallway (85 sq ft) and living area edge (40 sq ft). Pad disposal as Category 1 material.

Phoenix R150 LGR dehumidifier

Deployed in MIL apartment. Single unit adequate for contained scope.

Phoenix Focus air movers (4 units)

Distributed across affected areas.

Novatek NA-1500 HEPA scrubber

Deployed for particulate management during drywall demolition.

Tenant relocation coordination

MIL tenant temporarily relocated to primary residence guest bedroom during 7 days of active restoration. Not required for occupancy safety but improved comfort during the process. Homeowner coordinated directly with family member.

Drying and Reconstruction Timeline

Extraction and drying phase: 7 days. Reconstruction phase: 16 additional days.

Bathroom scope

Wall drywall replacement (bottom 12 inches, 22 linear feet). Vinyl floor retained after subfloor drying. Vanity cabinet base drying was successful; cabinet retained. Complete repaint of bathroom.

Hallway and living area scope

New carpet pad installation (125 sq ft affected combined). Existing carpet salvageable and cleaned; reinstalled after pad replacement.

Toilet supply-line replacement

New braided stainless supply hose installed by licensed plumber. Coordinating with plumber for inspection of other MIL apartment plumbing supply-lines (identified 2 additional aged hoses that were preventively replaced during the same visit).

Complete repaint

MIL apartment repaint of affected areas.

Insurance Coordination

Farmers HO-3 policy, $1,500 deductible. The claim was submitted under the homeowner’s standard policy without complication — the family rental arrangement did not trigger any policy exclusions since the MIL apartment was covered under the primary policy as part of the insured structure.

Documentation submitted:

• Photo series (147 photos through the loss and restoration)
• Failed supply hose documentation
• Xactimate scope with detailed line-item breakdown
• Tenant relocation documentation for ALE consideration (though ALE wasn’t triggered given the short displacement duration)

Initial Xactimate scope: $28,940. Farmers approved without modification. Homeowner responsibility limited to $1,500 deductible. Preventive supply-line replacement for the two other aged hoses in the MIL apartment was homeowner out-of-pocket (approximately $60 for materials).

Outcome

Full restoration completed 23 days after initial loss response. MIL apartment returned to fully functional condition. Family member (MIL tenant) returned to normal apartment use on March 6, 2024. Modest personal property replacement handled voluntarily by homeowner outside insurance scope.

Key Learnings

• Family rental arrangements (mother-in-law suites, adult-child rentals) typically fall under homeowner’s HO-3 coverage when the arrangement is informal and non-commercial. Formal rental arrangements (arm’s-length tenants, market-rate rent, standard lease) may trigger different coverage requirements. Reviewing your specific policy language is worth the time.
• Tenant personal property is not covered under the homeowner’s policy regardless of family relationship. Renters insurance ($15 to $25 monthly) protects tenant contents; even family tenants should consider carrying it. Family arrangements may include the homeowner voluntarily covering tenant contents losses, but this is generosity rather than insurance coverage.
• Braided stainless supply hoses at 10 years of age are approaching end-of-service life. Preventive replacement of all supply hoses throughout a home costs $60 to $150 in materials and prevents this specific failure mode. Multi-family and rental situations amplify this consideration — more toilets and fixtures means more failure points.
• Mobility limitations of elderly or disabled tenants extend response time and increase potential damage. Automatic water shutoff systems (Flo by Moen, Phyn) that shut off the main automatically on flow anomaly detection are worth serious consideration in households with mobility-limited occupants.
• Basement MIL apartment configurations are common in Utah County (multi-generational households are widespread). These arrangements produce specific insurance and restoration considerations worth understanding before any loss occurs rather than discovering during one.

Contact Vault Mold Removal

Phone: (385) 250-2825
Address: 1169 S 760 W, Provo, UT 84601
Hours: Monday–Saturday, 9:00 AM – 5:00 PM
Service Area: Lindon, all Utah County communities from our Provo dispatch.