What 'Home Age' Actually Predicts
Older homes have character. New construction has warranties. Here's what the home age factor in Custom RAAM is actually measuring—and how to weight it.
The home age factor in Custom RAAM isn't just a preference for new vs. old. It's a proxy for a cluster of risks and opportunities that correlate strongly with when a home was built.
What home age correlates with: Homes built before 1978 may have lead paint and asbestos. Homes built before the 1990s often have knob-and-tube wiring or galvanized steel plumbing that's past its service life. Homes from the 1950s–1970s frequently have original HVAC systems—charming, in need of replacement. Conversely, newer construction (post-2000) generally comes with modern electrical, plumbing, insulation, and building code compliance.
It's not about aesthetics. The age factor doesn't care whether you love Victorian architecture or prefer clean-lined modern homes. It's tracking the likelihood of deferred maintenance costs, code compliance gaps, and material safety concerns that a casual walkthrough won't surface.
The 1978 dividing line. Lead-based paint was federally banned for residential use in 1978. Any home built before that date carries non-trivial lead abatement exposure—especially relevant for families with young children. The RAAM score accounts for this.
When old is fine: A 1960s home that's been fully renovated—new roof, new HVAC, updated electrical and plumbing—is a different product from a 1960s home that's been cosmetically updated but never had mechanical work done. The RAAM home age factor scores from available data; your inspection fills in the gap.
New construction trade-offs: Post-2010 homes generally score well on age, but new construction in some markets has quality control issues that show up in the first 5–10 years. It's not automatic—it just shifts the risk profile.
How to weight it: For families with young children, weight home age at 10–20% to ensure older, potentially hazardous properties get flagged. For buyers who are experienced renovators and comfortable with older homes, or who specifically want pre-war character, you can weight it lower—5–10%—knowing you'll verify conditions at inspection.
Home age isn't destiny. But it's a strong predictor of what you're likely to encounter after you move in.
Ready to run your analysis?
Found this helpful?
More on Read the score
Watch a town or ZIP.
Every Monday: median price, days on market, inventory, and the RAAM-score shifts for the area you care about. Free, unsubscribe anytime.
Try it on a real Zillow listing.
Paste a Zillow URL — we'll prep it in the builder so you can set your weights and see the seven-factor score in under a minute.
Related reads
More on reading your raam score →What a 75 RAAM Score Actually Means
A 75 isn't good or bad on its own. Here's how to read a Custom RAAM score the right way—and what to do when two houses are both in the 70s.
What a Low Factor Score Is Trying to Tell You
A weak factor score is not just a number. It's a clue about future regret. Here's how buyers should read low-scoring categories.
Why a 'Perfect' House Can Still Be the Wrong Buy
A home can check every emotional box and still be a poor decision. Here's how to separate 'perfect' from 'right.'
Ready to Build Your Custom Analyzer?
Set your priorities and get personalized property scores in under a minute.