Several things could lead your insurance company to charge higher home insurance rates for an older home.

Outdated electrical wiring

Building standards have changed over the years, and some older homes have features that don't meet modern building codes. According to the Electrical Safety Foundation International (ESFI), some homes may have a 60-amp electrical system rather than the 100- or 200-amp service common today. Other older homes may feature knob-and-tube wiring, which is more exposed than today's style.

These factors increase fire risk which could lead to higher home insurance rates or even denial of coverage. Knob-and-tube wiring is considered so risky that many insurance companies won't cover a home with this type of wiring.

Outdated plumbing

Galvanized steel pipes are common in older homes. These plumbing systems tend to rust which can inhibit water flow and lead to water damage. Most insurers will take this into consideration when calculating your rate.

Storm-sensitive roof

It's important to know what kind of roofing material your older home has. Old materials could put your home at extra risk for wind, hail or other damage. It could also be more expensive to repair or replace older roofs, a factor your insurance company will consider.

Rare materials (replacement cost)

Reclaimed wood, antique doors and hand-painted windows can be difficult to replace. If older homes are seriously damaged, their hard-to-find materials and architectural flairs can make reconstruction a costly challenge. You'll want to ensure you have adequate replacement cost coverage to help cover the expenses.