The Merrimack Valley mixes historic mill cities with fast-growing suburbs. Lowell, Lawrence and Haverhill have many older multi-family homes and Victorians, while towns like Chelmsford, Andover, Tewksbury and Westford are full of colonials, capes, ranches and split-levels built in the decades after the war and since. Plenty of those houses are now on their second set of windows, or still on their first. The valley’s weather swings hard: cold northern winters, nor’easters that roll in from the coast, and hot, humid summer stretches. Windows that rattle in the wind or let in drafts make every season tougher. Vinyl replacement windows offer a clean, low-maintenance look, smooth operation, and a tighter seal, with ENERGY STAR certified options available depending on the package you choose. Because most of our Merrimack Valley projects are insert installs, we avoid tearing into exterior and interior walls, and most homes are finished in a single day.
Towns We Serve in Merrimack Valley (23)
- Amesbury
- Andover
- Billerica
- Boxford
- Chelmsford
- Dracut
- Dunstable
- Georgetown
- Groveland
- Haverhill
- Lawrence
- Lowell
- Merrimac
- Methuen
- Newbury
- North Andover
- North Reading
- Salisbury
- Tewksbury
- Tyngsborough
- West Newbury
- Westford
- Wilmington
Why Castle
- Vinyl windows only, in styles that fit your home.
- Doors too: entry, patio sliding and storm doors.
- Mostly insert installs: less mess, and most jobs finished in one day.
- ENERGY STAR certified options available depending on the package you choose.
- Castle Lifetime Guarantee on every project.
Get Your Free Estimate
Ready for new windows or doors in Merrimack Valley? Call Castle “The Window People” at (508) 425-4977 to schedule your free in-home estimate.
Frequently Asked Questions
Do you serve every town in Merrimack Valley?
Yes. Castle serves every city and town listed on this page. If you are not sure whether your home is in our area, call (508) 425-4977.
How long does a window replacement take?
Most of our projects are insert installations, and most jobs are finished in one day. Larger homes or full-frame replacements can take longer, and we will tell you up front.
Are your windows energy efficient?
We install vinyl windows only, and ENERGY STAR certified options are available depending on the package you choose.
What doors do you replace?
We replace entry doors, patio sliding doors and storm doors. Every project is backed by the Castle Lifetime Guarantee.