What we see on Arnold homes
Arnold's median house dates from 1977, which puts most of the town in the build-out between 1970 and 1990. 9,202 housing units, 79.6% of the occupied ones owner-occupied. Mostly owners, then, which usually means the decision turns on how long you plan to stay rather than on what it does to a rent roll. Only 0.8% predates 1940. Most bathrooms here have been done once already, and the question is usually whether whoever did it moved the plumbing or worked around it.
Seventies and eighties bathrooms mean fiberglass one-piece units and molded surrounds. Those do not rot, but they go soft underfoot, stain in a way that will not scrub out, and crack at the drain. Replacing one is usually a clean job, because the supply lines are copper or early PVC and generally fine, so this is more often a straight tub or shower replacement than a full remodel, and we will say so when that is what it is. On a shower specifically the real question is usually whether the tub stays at all, because the conversion is much the same job either way.
Housing-age and tenure figures: U.S. Census Bureau, American Community Survey 5-year estimates (tables B25034 and B25003), retrieved 2026-08-18.
What the water does here
Missouri American Water, northern Jefferson County publishes a total hardness of 4 to 13 grains per gallon for Arnold, which is hard at the top of the range.
Hardness that swings across the year is harder on a bathroom than a steady number, because the scale builds fastest at the top of the range and then stays. Grout takes it worst, because it is porous, so the calcium goes into the joint rather than onto it. High Performance Polymer Acrylic has no joint, which is the practical difference between resealing a shower every couple of years and leaving it alone.
Water hardness: Missouri American Water, northern Jefferson County, published water quality information (PWSID MO6010716), retrieved 2026-08-18.
Permits and paperwork in Arnold
Permits for work like this in Arnold come from City of Arnold Community Development Department. You will know at the consultation whether yours needs one, which is the point at which it is still useful to know. We pull the permit and we meet the inspector.
We are licensed and insured. The certificate comes with the paperwork, which saves you having to ask for it.
Where we work from, and what is nearby
Arnold, MO sits in Jefferson County, and we serve it from our Greater St. Louis office at 2424 Hwy 94 S. Outer Rd., St. Charles, MO 63303.
In Arnold that covers 63010. A ZIP missing from that list is worth a phone call rather than an assumption, and you will get a yes or a no on the spot.
What we can put on an Arnold house
BCI Bathrooms wall systems and surrounds in High Performance Polymer Acrylic or stone-look finishes, from a space-saving enclosure to a full walk-in. Shelving, seating and grab bars go into the wall while it is open, which is the only time they are easy. Low-threshold and barrier-free entries are a design decision, not a retrofit.
There is a showroom at 2424 Hwy 94 S. Outer Rd., St. Charles, MO 63303, with full-size units rather than swatches. Daylight changes a color more than most people expect it to.
Free consultation
Book a free consultation in Arnold
Choose a day and our Greater St. Louis office calls to confirm the time.
- A free consultation at your home
- A quote with no obligation
- Our office calls to confirm the time
Two things people in Arnold ask
Do I need a permit for this in Arnold?
It depends on the scope, and City of Arnold Community Development Department is the office that decides. We check before the crew is booked and we pull the permit when one is needed, so it is never something you find out about halfway through.
How far are you from Arnold?
Our Greater St. Louis office is at 2424 Hwy 94 S. Outer Rd., St. Charles, MO 63303, about 45 minutes away, up I‑270 and MO‑364. That is a drive time and nothing more: we do not publish arrival windows, so ask for a date and you will get a real one.

