Interior Painting across Framingham, Massachusetts.

Census figures put the median construction year of Framingham's housing at 1966, and that one number says a lot about the walls you are likely living with. A room in a house that age has probably been repainted by several owners, so latex over old oil-based enamel, patched nail pops, and ceilings yellowed by cooking are all things to check for before choosing a color.

Good interior work in a house like that is mostly preparation. The color goes on quickly; getting the surface ready to hold it is what takes the time, and it is where a written scope protects you.

Postwar rooms: drywall, early plaster board and tired trim

Roughly half of owner-occupied homes in the city were built between 1950 and 1969, a stretch that includes the big Cape and Ranch subdivisions north of Route 9. Interiors from that era usually mix gypsum board with some plaster-veneer walls, flat or lightly textured ceilings, and painted pine or fir casings that were originally finished in oil.

Those trim pieces are the trap. Latex brushed straight over old alkyd enamel tends to peel off in sheets the first time someone bumps a door casing. We test glossy trim, scuff-sand it, and use a bonding primer where the old coat is oil before any topcoat goes on.

• Dent and nail-pop repair on drywall, then spot priming so patches don't flash through the finish
• Bonding primer on previously oil-painted doors, casings and baseboards
• Stain-blocking primer on ceilings with water marks or smoke and cooking residue
• Caulk renewal where 60-year-old trim has pulled away from the wall

Older plaster houses in the Centre, South Framingham and Saxonville

About 17% of housing units in the city date to 1939 or earlier. That includes 19th-century Greek Revival, Italianate and Second Empire houses, mill-era worker cottages, and the early-1900s Colonial Revival, Dutch Colonial and bungalow blocks around Waverly Street. Inside, that usually means lime plaster on wood lath, deep window casings and a lot of original millwork.

Plaster walls show hairline cracks at corners and over doors as the framing moves with the seasons. We cut those out, fill with a setting compound rather than premixed spackle, and tape the ones that keep coming back. Where plaster has let go of the lath, we will tell you plainly whether it can be re-secured or needs a plasterer before painting makes sense.

If your house sits in Framingham Centre or the older blocks of South Framingham, it is worth knowing that the local historic district rules cover exteriors only. The city's own guidelines say interior colors are not regulated, so you can choose freely inside.

Lead dust is an interior problem first

Census data shows 72.6% of the city's housing units were built before 1980, which is the closest bracket to the 1978 federal lead-paint cutoff. Lead in a pre-1978 interior usually sits in the bottom layers on windowsills, sashes, door edges and stair parts, the places friction turns old paint to dust.

When we disturb painted surfaces in a pre-1978 home, we follow lead-safe work practices: plastic containment, misting instead of dry sanding where possible, HEPA vacuuming and a careful cleanup before the room goes back into use. Our lead-safe painting page explains what that looks like day to day, which matters most if you have young children or are expecting.

Rentals, move-outs and occupied homes

Census figures show 45.2% of occupied homes in the city are rented. If you own one of them, a repaint between tenants or before a sale rewards speed and a neutral palette, but they still need the same prep, because a landlord who repaints over grease and scuffs is back to square one after the next lease.

For families who are living in the house during the work, we plan room by room, keep one bathroom and the kitchen usable, and cover floors and furniture every day rather than just at the start.