The wall you want to open is doing more than you think
If you're standing in a kitchen or living room in one of Trappe's older homes, maybe a twin near Main Street or a farmhouse-style place off Gravel Pike, looking at a wall and picturing it gone, you're not alone. Open floor plans are the most requested change in this area, and the wall between the kitchen and dining room is almost always the first target. The trouble is that in a lot of these houses, built anywhere from the 1950s through the 1980s with some genuinely old farmhouses mixed in, that wall is often holding up something you can't see from where you're standing.
You probably noticed a slight sag in the floor above, or a door upstairs that's started sticking. Maybe you're just tired of a choppy layout. Either way, before anyone picks up a sledgehammer, the question that matters is whether that wall is load bearing, and that question is not always obvious from looking at drywall.
What you can check yourself before calling anyone
Head down to the basement or crawlspace if you have one. Load bearing walls usually line up with a beam, a steel I-beam or a wood girder, running underneath them, or they sit above a foundation wall. If you can see a support beam directly below the wall you want to remove, that's a strong sign it's carrying weight from above.
Check your attic too, if you can get up there safely. Look at which direction the roof rafters or trusses run. Walls that run perpendicular to the joists above them are more likely to be structural than walls running parallel. None of this gives you a certain answer, but it narrows things down and helps you ask better questions when you do bring someone in.
Exterior walls are almost always load bearing. That surprises people who assume only interior walls carry weight. In homes around here with additions tacked on over the decades, sometimes an old exterior wall got absorbed into the interior during a previous remodel and nobody updated the framing to reflect it. That's a common surprise in this region's housing stock.
More on this from general contractor.
What changes once a load bearing wall is involved
Once you know a wall is carrying weight, the whole scope of the project shifts. You're no longer just removing drywall and studs. You need a way to transfer that load somewhere else, usually a new beam sized correctly and support posts at each end that carry the load down to the foundation. That means opening up the floor or ceiling in more places than you planned, and it often means work in the basement to make sure the foundation under the new posts can actually take the added point load.
This is also where Montgomery County's permitting comes into play. Structural changes need a permit and typically a stamped plan from a structural engineer showing the new beam size, the post locations, and how the load gets down to the footing. Skipping this step is the kind of thing that causes real problems later, especially if you ever sell the house and a buyer's inspector asks for documentation that doesn't exist.
Why this region adds its own wrinkles
Trappe sits in a part of Pennsylvania that gets real freeze-thaw cycles every winter, and that matters more than people expect when you're changing how a house carries its loads. Foundations here can shift slightly over decades as the ground heaves and settles, and older fieldstone or block foundations common in the area don't always have uniform bearing capacity across their length. A spot that looks solid might not be rated for a new concentrated load from a support post without some reinforcement.
Older homes in this area, especially anything built before the 1960s, may also have balloon framing or full dimension lumber that doesn't match today's engineering tables. A 2x8 from 1948 is not the same as a 2x8 today. That difference matters when an engineer is calculating what a new beam needs to span and hold.
Where this stops being a homeowner project
Checking the basement, looking at joist direction, getting a general sense of the layout: that's all reasonable to do on your own. But sizing a beam, calculating post loads, and figuring out whether a foundation needs a new footing poured underneath it is engineering work, not guesswork. This is also where a general contractor earns their keep, because they coordinate the structural engineer, the permit application, and the sequence of work so the house stays safe and standing while the wall comes down and the new support goes in.
Temporary shoring during construction matters too. A wall doesn't get removed and replaced with a beam in the same afternoon. There's a period where the load has to be carried by temporary posts, and getting that wrong, even for a day, is how ceilings crack or worse. If you're looking at a wall and thinking about opening it up, that's the point to bring in someone who does this regularly, not after the first stud comes out.