Buying an Older Home: How to Tell If a House Has Good Bones

An older home has good bones when its structure, layout, drainage and major systems are fundamentally sound, even if the finishes are tired. In Northern Virginia, that often describes a 1940s to 1970s colonial, Cape Cod, rambler or split-level with a solid foundation and dry basement, where the real work is cosmetic. The trick is telling those homes apart from ones where the surface looks fine but the expensive problems are hiding behind the walls.

What counts as good bones

When I walk an older house with buyers, I sort everything we see into two piles: things you can change with a weekend, a budget and a contractor, and things that are expensive or impossible to change. Good bones live in the second pile.

Usually good bones (hard to change)	Usually cosmetic (easier to change)
Solid foundation with no active movement	Paint, wallpaper and trim
Straight rooflines and sound framing	Light fixtures and hardware
Positive drainage away from the house	Carpet and most flooring
A layout that works or can be opened up without moving major beams	Kitchen cabinets and counters
Ceiling heights and window placement	Bathroom vanities and tile
Lot size, orientation and location	Landscaping and fencing

A room-by-room checklist for older Northern Virginia homes

Foundation and basement

• Look for horizontal cracks, bowing block walls, or stair-step cracks in masonry. Hairline vertical cracks in poured concrete are common; wide or growing cracks deserve an engineer.
• Check for efflorescence (white mineral deposits), water stains, a musty smell or fresh paint on just the lower part of a wall.
• Find the sump pump, if any, and ask when it was last replaced.
• Walk the exterior: downspouts should discharge well away from the foundation, and soil should slope away from the house.

Roof and attic

• Note the roof age on the seller disclosure and look for sagging ridgelines.
• In the attic, look for daylight, water stains on the sheathing, and insulation depth.

Electrical

• Many homes from this era still have original or early replacement panels. Some older panel brands and models are known to insurers and inspectors as concerns.
• Ungrounded two-prong outlets, knob-and-tube wiring and aluminum branch wiring may all show up in pre-1975 homes and can affect insurance.
• Count outlets in kitchens and bathrooms, and check for GFCI protection near water.

Plumbing and sewer

• Galvanized steel supply pipes corrode from the inside and can reduce water pressure over time.
• Cast iron and clay sewer lines can crack or let in tree roots. A sewer scope camera inspection is one of the best few-hundred-dollar investments on an older home.
• Look under sinks for old repairs and check water pressure with two fixtures running.

Heating, cooling and fuel

• Many older homes in Arlington and Fairfax were originally heated with oil. Ask whether there is or was an oil tank, and whether an underground tank was removed or abandoned in place with documentation.
• Check the age of the furnace, heat pump, air conditioner and water heater. Most have a predictable lifespan.

Environmental and legal checks

• Lead paint: For homes built before 1978, federal rules require the seller to give a lead disclosure and EPA pamphlet, and buyers get a 10-day opportunity to test unless they agree to change or waive it. The EPA’s real estate disclosure page explains the rule.
• Radon: Radon shows up across Northern Virginia regardless of a home’s age. My guide to radon testing covers how to test and mitigate.
• Asbestos: Some older floor tiles, pipe wrap and siding may contain asbestos. It’s usually only a concern if disturbed during renovation, so test before demolition.
• Historic districts: Parts of Arlington, Alexandria and some Fairfax County areas have local historic district rules that require approval for exterior changes. Ask before you plan an addition.
• Underground tanks: The Virginia Department of Environmental Quality oversees petroleum storage tank issues, and a closure document is worth requesting.

The inspection plan I recommend

1. General home inspection. Start here. My home inspection guide covers what to expect.
2. Sewer scope. Especially for homes with mature trees and original drain lines.
3. Structural engineer. If the inspector flags foundation movement or framing concerns.
4. Licensed electrician. For older panels, aluminum wiring or a large number of ungrounded outlets.
5. Chimney inspection. Older masonry chimneys often need liner or crown repairs.
6. Oil tank sweep. If records are unclear about an old tank.

Keep these inside your inspection contingency window. If you need more time for a specialist, negotiate that up front.

A worked example: two older homes, same price

Illustrative scenario with hypothetical costs. Imagine two 1950s ramblers in Fairfax County listed at the same price.

Item	House A	House B
Kitchen and baths	Original, very dated	Freshly renovated
Basement	Dry, solid poured walls	Fresh paint, musty smell, efflorescence
Electrical	Panel replaced, grounded outlets	Older panel, two-prong outlets
Sewer line	Replaced with PVC	Original cast iron, roots visible on scope
Likely surprise costs (illustrative)	Low	Waterproofing, panel upgrade, sewer repair

House A looks worse in photos but has better bones. House B looks move-in ready but may need costly work in the parts of the house that are hardest to fix. With House A, a buyer could renovate the kitchen on their own timeline. With House B, the most urgent costs are invisible and not optional. Ask contractors for written estimates before deciding.

Common mistakes

• Falling for a flip’s finishes without asking what was done behind the walls, and whether permits were pulled.
• Skipping a sewer scope on a home with large trees near the line.
• Assuming an oil tank is gone because the home now has gas heat.
• Waiving the lead paint testing window without understanding the trade-off.
• Underestimating how much an outdated electrical system can affect insurance quotes.
• Planning a big addition without checking historic district or zoning rules.

If the house itself has more problems than value, the land may still be the prize. My notes on buying a teardown or lot in Arlington cover that path, and the trusted vendors list can help you line up inspectors and contractors.

Frequently asked questions

What does it mean when a house has good bones?

It means the structure, layout, roof framing, drainage and major systems are sound, so most of the needed work is cosmetic. Those are the features that are expensive or impossible to change later.

Should I buy a house built before 1978?

Many great homes in Northern Virginia were built before 1978. Plan for the federal lead disclosure, consider testing, and use lead-safe practices if you renovate.

What inspections should I get on an older home?

Start with a general home inspection and add a sewer scope, plus a structural engineer, electrician or chimney inspection if the inspector recommends them. Schedule them early so they fit inside your contingency period.

Are old homes more expensive to insure?

They can be, especially with older electrical panels, aluminum or knob-and-tube wiring, or an aging roof. Get insurance quotes during your inspection period so there are no surprises.