In-Law Suites Are Surging: Here’s Why (and What You Need to Know Before You Build)

Why Families Are Reconsidering Elder Care

Sticker shock is often what starts the conversation. In Pennsylvania today, assisted living averages about $6,100 per month. Nursing homes run $11,800 to $13,000 per month. Even part-time in-home care averages around $6,300 per month. Add that up, and many families are staring at $72,000–$156,000 per year in elder care expenses.

That’s why more families across Lancaster County and surrounding areas are rethinking their options. Instead of spending six figures year after year, they’re investing those dollars into their own property by building an in-law suite (sometimes called an accessory dwelling unit or accessory apartment).

It’s not just about the money. These suites allow loved ones to age with dignity, stay close to family, and maintain independence, while controlling long-term costs.

The Growing Trend of Multigenerational Living

The numbers back it up: multigenerational living in the U.S. has more than doubled since the 1970s, and it keeps rising. What used to be rare is now becoming normal again.

Here in Lancaster County, we’re seeing more requests than ever for in-law suites, whether it’s parents moving in with adult children, or families planning for future care needs. The emotional benefit is clear: families want to stay together, but they also want privacy and safety. A well-designed in-law suite provides both.

The Homework Checklist: What to Do Before You Build

Before you call a builder, there’s legwork that needs to be done. Every township and borough in Pennsylvania has its own rules, and skipping this homework can lead to costly delays.

1.  Zoning & Ordinances

• Look for terms like “Accessory Dwelling Unit (ADU),” “In-Law Suite,” or “Accessory Family Apartment.”
• Some municipalities allow them by right. Others require a special exception, conditional use approval, or even a variance.
• Some ordinances require that the property owner live on-site, either in the main home or the suite.
• Expect limits on square footage, setbacks, parking, and lot coverage.

Homework: Visit your township or borough website, pull the zoning ordinance, and search for the terms above. Don’t assume all municipalities handle this the same way.

2.  Building Code & Inspections

Pennsylvania enforces the Uniform Construction Code (UCC). As of today, we’re still under the 2018 version, even though the 2021 codes are waiting in the wings. That means:

• Fire separation between units (usually a 1-hour wall or floor assembly).
• Proper egress windows in bedrooms.
• Smoke and CO alarms, often interconnected between units.
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