Buying a 1900s Home in Portland:
What to Watch For
The 1900s marked the beginning of the Craftsman era in Portland, with homes built with extraordinary materials but without any of the systems we take for granted today. Here’s what buyers need to know.
Portland’s Craftsman bungalows are some of the most coveted homes in the city. Walk through Sellwood, Irvington, Ladd’s Addition, or Woodstock on any weekend and you’ll see buyers falling in love with wide front porches, built-in bookshelves, and old-growth fir floors that glow under the right light.
The homes deserve that attention. But they also deserve an inspection that understands what 120-plus years of Pacific Northwest weather, multiple owners, and evolving building codes have done to the structure, systems, and materials.
This is part two of a 13-part series on buying homes in Portland by decade. Part one covered 1890s homes. This one covers the 1900s, a decade when Portland was growing fast, the Craftsman style was taking hold, and residential construction methods were beginning to standardize.
How the 1900s Differ From the 1890s
The 1900s brought a few meaningful changes from the prior decade, though the homes remain closely related in terms of what buyers face today.
Poured concrete became more common as a foundation material in the 1900s, though it was rarely reinforced with steel rebar until much later. This is a step forward from the stone and rubble masonry of the 1890s, but it still means unreinforced concrete that can crack, settle, and show seismic vulnerability.
Electrical service was expanding rapidly in this decade. More homes were wired from the start (not retrofitted later), which means more homes from this era have had a complete and original knob-and-tube system that has then been modified over 120 years.
The Craftsman style that dominates the 1900s housing stock in Portland brought with it specific construction details: wide overhanging eaves, built-up rafters, decorative brackets, and large front porch structures. These are beautiful features. They’re also features that collect moisture, require ongoing paint maintenance, and can deteriorate if not kept up.
Functionally, a 1900s Portland home and an 1890s Portland home share most of the same inspection concerns. The materials, foundation types, electrical systems, and plumbing constraints are closely parallel. The difference is often one of degree and the specific architectural style.
Foundations: Unreinforced Concrete and What It Means
Most 1900s Portland homes sit on unreinforced poured concrete or masonry foundations. Some older examples still have stone or brick. The word “unreinforced” is key.
Reinforced concrete (concrete with steel rebar embedded to give it tensile strength) became more common in residential construction in the 1920s and 1930s and was standard by the post-war era. A 1900s foundation without reinforcement relies entirely on the concrete itself to resist movement. It can handle compression well. It handles tension and lateral movement poorly.
Cracks in these foundations tell a story. Hairline cracks from normal concrete curing are common and generally not structural. Horizontal cracks in a basement or crawlspace wall can indicate lateral soil pressure and are more serious. Diagonal cracks at corners often indicate settlement. Stair-step cracks in masonry indicate differential movement between units.
The inspector documents crack patterns, width, and any evidence of active movement. A structural engineer is recommended when cracks suggest structural concerns rather than cosmetic settlement.
Seismic vulnerability is the other consideration. Portland is in the Cascadia subduction zone. A 1900s home with an unreinforced concrete or masonry foundation and cripple wall framing (the short stud wall that sits on top of the foundation in crawlspace homes) is more vulnerable to seismic damage than a retrofitted home. Seismic retrofitting involves adding plywood shear panels to the cripple walls and anchor bolts through the mudsill to the foundation. It’s a defined scope of work with known costs, and it meaningfully improves earthquake performance.
Electrical: 120 Years of Modifications
Homes from the 1900s were wired with knob-and-tube (KT) wiring: single copper conductors run through ceramic knobs that hold wires away from framing and ceramic tubes that protect wires where they pass through wood. There is no ground wire in a KT system.
A 120-year-old home’s electrical system has been touched many times since original installation. Panels have been updated (or not). Circuits have been added. Outlets have been changed. In some homes, portions of the KT wiring have been replaced during remodels. In others, original KT remains throughout.
The inspector evaluates the electrical system as found. That includes the main panel, visible wiring in the attic and crawlspace, outlet function and grounding, and any conditions that warrant licensed electrician review.
Specific concerns with KT wiring that has been modified:
Splices. KT wiring was meant to run as continuous conductors. Splicing (connecting new wire to old) is not acceptable inside walls or ceiling spaces. Splices should be made in accessible junction boxes. Improper splices in concealed spaces are a safety concern.
Insulation coverage. Knob-and-tube wiring was designed to be run in open air, in the space between the framing and the plaster or drywall. When insulation is blown in around or directly on KT wiring, it traps heat that the open-air system was designed to dissipate. This is a documented fire hazard. Many homes from this era have had insulation added without accounting for this problem.
Overloaded circuits. KT circuits were sized for the electrical loads of the early 1900s. Modern uses like air conditioners, electric dryers, large refrigerators, and multiple electronics can exceed what those circuits were designed to carry.
Any home from the 1900s with active KT wiring should have a licensed electrician review the system. The real question is what the electrician finds and what it will cost to address.
Plumbing: The Sewer Line Question
Original supply lines from the 1900s have almost certainly been replaced by now, at least partially. Galvanized steel pipe, which was common through the mid-20th century, corrodes internally and restricts flow over decades. A home from the 1900s with all-original supply plumbing would be unusual at this point.
What is more likely to remain is the drain system, specifically the main sewer line from the house to the street. These lines were typically installed in clay tile sections, and they can last a very long time. They can also develop root intrusion at the joints, cracks from soil movement, and belly sections where settling has caused the line to sag and hold water.
A sewer scope inspection runs a camera from the cleanout (typically near the foundation) through the line to the street. It shows what the line looks like at the time of the scope: root intrusion, cracks, belly, and any other conditions. For a home with a 100-plus-year-old sewer line, this is not optional due diligence. It’s essential.
Drain line replacement from the house to the street is a significant cost, often $5,000 to $15,000 or more depending on depth, length, access, and whether the line runs under a structure or paving. Knowing the condition before closing can help avoid a major surprise.
Common findings and concerns on a home from this era, organized by how the inspector documents them.
- Foundation type (poured concrete, brick, or stone): document all visible cracks with location and width
- Diagonal cracks at foundation corners suggesting differential settlement
- Horizontal cracks in basement or crawlspace walls, potential lateral pressure
- Cripple wall framing without seismic blocking or shear panels
- Knob-and-tube wiring present: document extent, locations, and visible condition
- Insulation in direct contact with knob-and-tube wiring
- KT wiring splices made outside of accessible junction boxes
- Galvanized supply lines: flow, pressure, and discoloration at fixtures
- Crawlspace moisture, vapor barrier condition, and wood deterioration
- Roof covering age and condition: document approximate age
Craftsman Details: The Inspection Concerns You Might Not Expect
Craftsman homes have distinctive exterior details that deserve specific attention.
Wide overhanging eaves. Craftsman eaves typically project 18 to 24 inches or more. They provide good protection for the siding below but also create large horizontal surfaces that hold debris and moisture. Fascia boards, soffits, and exposed rafter tails need to be evaluated for paint condition, moisture damage, and rot.
Front porch structures. The covered front porch with tapered columns on brick or stone piers is a defining feature of the Craftsman style. Porch decking can deteriorate. Posts can be moisture-compromised at the base. Pier foundations for porch columns can settle independently from the main foundation, which is why you sometimes see porches that have dropped away from the house slightly over time.
Decorative brackets and exposed wood details. These are high-maintenance elements. Paint failure on any exposed wood element leads to moisture infiltration and eventual rot. Walk around the home and look at every piece of exterior wood (end grain surfaces, bracket bottoms, column bases) and evaluate the paint condition. These are the areas where deferred maintenance shows up first.
Built-ins and original woodwork. Interior Craftsman details like built-in bookshelves, window seats, china cabinets, and coffered ceilings are valuable features and one reason these homes sell at a premium. They’re also things that have been modified, damaged, and repaired over 120 years. Settlement cracks in plaster around built-ins can indicate movement history. Check that built-in cabinetry still functions as intended.
Heating and Insulation: Built for a Different Era
Homes from the 1900s were not designed for energy efficiency. Insulation was minimal or absent. Windows were single-pane wood sash. Heating was typically a central furnace burning wood or coal with gravity-fed air distribution, a system that has almost certainly been replaced, sometimes multiple times.
What exists today depends entirely on what has been updated. Some 1900s Portland homes have been extensively renovated with updated windows, added wall insulation, and modern HVAC systems. Others have had minimal updates and retain much of their original thermal envelope performance, which is to say very poor.
The inspector evaluates the installed heating and cooling systems for condition and function. Thermal imaging, included on every Trusted Home Inspections inspection, can show temperature patterns that may point to insulation gaps and heat loss in the building envelope. Attic insulation levels in homes from this era are often below current code minimums even where insulation has been added.
This matters for buyers because it affects utility costs and comfort. An un-insulated or poorly insulated 1900s Portland home will be expensive to heat and cool. Improving the envelope is possible but in many cases involves working around original construction details that were not designed to be insulated.
A 1900s Portland home rewards buyers who understand what they’re buying. The old-growth framing, the Craftsman details, the character of the era: these are real. So are the foundation, electrical, and sewer line considerations. Get the inspection, get the sewer scope, and go in with a clear picture.
Scheduling Your Inspection
Trusted Home Inspections serves the full Portland metro and SW Washington, including the inner-city neighborhoods (Sellwood, Irvington, Woodstock, Ladd’s Addition, Alberta Arts District) where 1900s Craftsman homes are concentrated.
Russ Motyko is Oregon City’s only Certified Master Inspector®, dual-licensed in Oregon (OCHI #1898) and Washington (DOL #1856), and a licensed general contractor, with 3,000+ inspections completed. Thermal imaging is included at no additional charge on every inspection.
Book at the online scheduler or see the buyer’s home inspection page.
Previous in this series: Buying an 1890s Home in Portland: What to Watch For.
1900s Portland Home Inspection FAQ
