In-Law Suites in Villanova, PA
Room for family without anyone giving up independence. MAG Development designs and builds in-law suites and accessory dwellings in Villanova — attached suites, garage conversions and detached cottages, built to be permitted properly and lived in comfortably.
Villanova has the lots for this
Multi-generational living has become one of the most common reasons homeowners here call us. A parent is ready to stop maintaining a house of their own, or an adult child is back for a few years, and nobody wants the arrangement to mean shared bathrooms and no privacy.
Villanova is unusually well suited to solving it. Lot sizes are generous by Main Line standards, which keeps options open that are simply not available in denser towns — including a detached cottage, the version that gives both households the most privacy and tends to hold its value best.
For current costs across every route, see the in-law suite and ADU cost guide.
Four ways to add a suite in Villanova
Attached suite
A private bedroom, full bath and sitting area off the main house, usually with its own entrance. The most flexible option and the easiest to integrate day to day.
Garage conversion
The lowest-cost route to a full suite, because the foundation, walls and roof already exist. The work is insulation, egress, ceiling height and a proper floor assembly.
Basement suite
Viable where the basement is dry and tall, especially with a walkout. Legal egress and moisture control decide whether it is straightforward or expensive.
Detached cottage
Maximum privacy for both households and the strongest long-term value — and the option Villanova lot sizes most often allow.
Designing for someone who may become less mobile
The best in-law suites are designed for the person a decade from now, not just the person moving in. Zero-step entry, wider doorways, a curbless shower with blocking already in the walls for future grab bars, lever handles, and lighting and outlets at reachable heights all cost very little during construction and are expensive and disruptive to retrofit.
The other decision that shapes both cost and permitting is the kitchen. A kitchenette serves most households and adds far less than a full kitchen, which brings gas or a dedicated circuit, full venting and cabinetry — and in some municipalities changes how the space is classified. We settle that at design, with Radnor Township’s requirements in front of us rather than behind us.
How a in-law suites project runs in Villanova
Consultation
We look at the property, talk about who the suite is really for, and lay out which routes your lot and the township allow.
Design & engineering
A layout built around privacy, accessibility and how the two households will actually share the property.
Permits
We prepare and submit the package and manage review — including how the space is classified, which matters later.
Build
One accountable crew through to final inspection, with a properly permitted suite at the end.
In-law suites across Villanova and the Main Line
We build suites and additions throughout the Main Line and South Jersey:
Villanova in-law suite FAQ
How much does an in-law suite cost in Villanova?
Attached suites typically run $150,000–$320,000 depending on whether a full kitchen is included, garage conversions $100,000–$200,000, and detached cottages $250,000–$350,000+. Roughly $300–$450 per square foot for attached construction.
Can I build a detached ADU in Villanova?
Often yes, and lot sizes here make it more feasible than in most Main Line towns — but it depends on Radnor Township zoning, lot coverage and setbacks for your specific parcel. We establish that before design goes far.
Does the suite need its own kitchen?
Not always. A kitchenette covers most multi-generational households at a fraction of the cost. A full kitchen adds $30,000 or more and can change how the township classifies the space, so it is a decision worth making deliberately.
What accessibility features should we build in?
Zero-step entry, 36-inch doorways, a curbless shower with blocking for future grab bars, lever handles, and reachable switches and outlets. Inexpensive now, costly later.
How long does an in-law suite take?
Two to four months of design, engineering and approvals, longer for a detached cottage, then three to eight months of construction depending on the route. If the move-in is tied to a real date, we work backward from it.
Will it add value to the property?
Yes — multi-generational demand on the Main Line is strong, and a properly permitted suite widens the buyer pool considerably. An unpermitted conversion does the opposite, which is why classification matters.