Addison's 1970s Belt Line townhome belt is a great starter market — smaller footprints, older-neighborhood charm, and prices below single-family. But at 50 years old, the plumbing is at end-of-life on most of these units.
Before you close, work through this checklist with your inspector — or hire us for a pre-purchase plumbing walk-through.
Water supply material
- Original copper (typical) — check for green corrosion at joints and any prior spot repairs. Pinholes are the failure mode. A home over 40 years old on original copper has 5–10 years before the first pinhole is likely.
- Polybutylene — the gray plastic pipe (recalled in a class action). If present, budget for full repipe immediately.
- Galvanized — rare in 1970s builds but possible. Failure mode is interior scale that eventually chokes flow.
Cast-iron drain lines
Most 1970s Addison townhomes have cast-iron drain lines under slab. Life expectancy is 50–75 years — you are inside that window. Ask for a camera inspection before close. Look for:
- Bellies (sections that hold standing water)
- Root intrusion at joints
- Interior scaling reducing diameter
- Any collapsed sections
Water heater
If the existing water heater is original or 10+ years old, budget for replacement in year 1. On Dallas hard water without a softener, tanks rarely make 12 years.
Slab age + slab leaks
Ask the seller (in writing) about any prior slab leaks. Multiple leaks = repipe candidate. Also check for foundation cracks that align with plumbing chases.
Gas system
If the townhome has natural gas, verify the meter, the shutoff, and the appliance connections. If a range or dryer was moved during a remodel, the gas line may not be up to current code.
Sewer camera — the one inspection to add
Standard home inspections do NOT camera the sewer line. In a 50-year-old townhome, this is the single most valuable add-on. A camera costs a small fee; a bad line costs $10K+. Do it before close.
HOA plumbing details
Ask the HOA:
- What is HOA vs. unit responsibility for plumbing?
- Any prior stack backups in the building?
- Master shutoff protocol and after-hours contact?
- Is a sewer / water backup endorsement in the master policy?
Pre-purchase inspection — what we do
For a flat rate, we visit the townhome with you or your inspector and:
- Test water pressure at multiple fixtures
- Inspect the water heater and note age + condition
- Look at exposed supply lines (water heater area, under-sinks)
- Camera the main sewer line
- Test all shutoffs
- Check the meter for a passive leak
- Provide a written report you can attach to your close file
Many buyers negotiate a repipe credit or seller-paid repair based on this report. Worth every dollar for peace of mind on a 50-year-old townhome.
Belt Line Plumbing expert insight
This guide reflects what our licensed Texas RMP plumbers see on real local-specific calls across Addison, Farmers Branch, Carrollton, and the greater Dallas North Tollway corridor. Belt Line Plumbing Co. has served the Addison area since 2007, with 412+ five-star reviews from north Dallas homeowners, property managers, and Belt Line Restaurant Row operators.
Local factors that affect the advice above: North Texas expansive clay soil drives most residential slab and sewer failures; Dallas Water Utilities supply water at 8–11 grains of hardness per gallon shortens every water heater and tankless system without a softener; and the February 2021 Winter Storm Uri freeze exposed attic supply lines across almost every 1970s–2000s Addison home. If your situation includes any of these local realities, factor them in before deciding between repair, replacement, or a preventive upgrade.