Homeowner with a 1939 bathroom needs to replace a cracked commercial flushometer toilet with an 8-inch rough-in, but modern toilets don't support that rough-in, risking damage to original tile work.

No modern toilet manufacturer offers an 8-inch rough-in bowl, and plumber says adapter solutions won't work, leaving only demolition or rare used parts.

Opp. Score

Severity

4High

Willingness to Pay

explicit

Added

May 8, 2026

Workarounds Described

searching Facebook Marketplace for a unicorn toilet
hiring a plumber who says demolition is needed

Implied Software Gaps

A platform that connects homeowners with rare toilet parts and retrofit specialists without requiring demolition

App Concept

RoughIn Retrofit

RoughIn Retrofit is a specialized marketplace and compatibility engine that helps homeowners and plumbers find and purchase rare rough-in toilets, adapters, and custom flanges. It matches users with vintage toilets, 3D-printed adapters, or retrofit kits, preventing tile destruction. Users list their rough-in measurements and get matched with available solutions nationwide.

Key Features

Measurement input for rough-in, bowl shape, and flush type
Marketplace for vintage and NOS toilets
Custom adapter design service (3D-printed or metal)
Step-by-step retrofit guides with plumber referrals

Target Users: Homeowners and plumbers dealing with non-standard rough-in toilets in historic homes (pre-1950) across the US.

Revenue Model: Freemium with $9.99 per listing fee for sellers, 10% commission on adapter sales, and $49/year premium subscription for priority matching and plumber directory access.

Existing Solutions Mentioned

plumber consultationFacebook Marketplace

Part of App Idea

Homeowner with a 1939 bathroom needs to replace a cracked commercial flushometer toilet with an 8-inch rough-in, but modern toilets don't support that rough-in, risking damage to original tile work.

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