Exterior Painting across Bedford, Massachusetts.

The outside of a house is where its age shows most plainly. Here the range runs from an early-18th-century saltbox on North Road, the Job Lane House, through the Colonial and Federal buildings of the town center, to a large stock of postwar homes and three decades of newer construction. Each has its own failure points, and on some streets there is also a town review to clear before changing color.

Housing from the 1950s and 1960s makes up 32.7% of units, more than any other twenty-year span in the census table. From 1990 through 2019, another 37.9% of units went up. Where a newer house is clad in a material that is not meant to be painted, the job may shrink to trim, doors and garage doors; where it has wood or fiber-cement siding, it is a full repaint like any other.

When a paint color needs a hearing

The town's Historic District and its Historic District Commission were set up by Town Meeting in 1964 under a special act. Inside that local district, an owner applies for a public hearing before making external changes, and the commission's list of covered items includes paint color, with white as the stated exception. Applications go through the Code Enforcement Department, and the town publishes Bedford Historic Guidelines for applicants.

Being on the National Register is a separate matter. The Bedford Center Historic District, listed in 1977 and enlarged in 2014, runs along Great Road between Bacon and Concord Roads with adjoining side streets, but the commission's web page does not publish the local district's boundaries, so do not assume one equals the other. If you are unsure whether ordinary repainting of your house needs a hearing, the town's advice is to contact a commission member, and it is worth doing that before choosing a color rather than after.

Lead-safe scraping outdoors

More than half the local housing, 54.1%, predates 1980, and federal lead rules reach every house built before 1978. Outdoors, EPA's renovation rule applies once paid work disturbs more than 20 square feet of paint. On a full repaint of an older clapboard house, scraping one wall can be enough to pass that threshold.

That means ground covering extended out from the foundation, warning signs, no open-flame burning, and collecting debris every day so paint chips do not end up in garden beds. The lead-safe painting page has the full procedure.

Prep decides how long it lasts

The common exterior paint failures guide explains why blistering, alligatoring and peeling each point to a different cause.

• Loose and peeling paint scraped back to a sound edge, then feathered so the next coat does not show ridges
• Bare wood spot-primed the same day it is exposed, before it can take on moisture
• Failed caulk at corner boards, window casings and trim joints cut out and replaced
• Soft wood at sills and the bottom courses of siding probed and repaired or replaced before painting
• Mildew washed and treated rather than painted over

Picking the season

Exterior latex needs surface and air temperatures above the label minimum, which for most products is around 35 to 50 degrees, plus dry conditions while it cures. In eastern Massachusetts that leaves a working window from spring into fall, with cold nights and early dew narrowing it at both ends. Whether late-season work is still possible is covered in painting a house exterior in November.

If the deck needs attention too, the deck staining page for Bedford explains why the house usually goes first.