Your partner for plumbing and energy efficiency
Licensed Plumbers in Waltham & Greater Boston
Owner-operated since 2022. Our shop is on Felton Street in Waltham — when you call, the truck is coming from your area, not from a dispatch center three towns over.
- Plumbing license
- 1310027098-PL-CMA licensed
- Shop
- 99 Felton StWaltham, MA
- Service call
- Free$89 fee only if you go ahead
- Workmanship
- 5 yearsNo labor charge
- Hours
- 8am–8pmMonday through Friday
What plumbing services do you offer in Waltham?
Residential plumbing across Waltham, Newton, Watertown and twelve more towns. Written pricing before we start — always.
Plumbing Repair
Leaks, running toilets, failed shutoffs, low water pressure, noisy pipes.
Water Heater Installation
Replacement and correct sizing, with code-compliant venting and expansion control.
Water Heater Repair
No hot water, sediment rumble, leaking tanks, thermostat and element faults.
Tankless Water Heaters
Installation, repair and descaling for on-demand systems.
Drain Cleaning
Kitchen, bath and main line, with camera inspection where it's warranted.
Leak Detection
Finding it before opening the wall, not after. Slab, supply and behind-wall leaks.
Repiping
Replacing galvanized supply — whole house or one run at a time.
Boiler Repair
Steam and hot water systems — standard equipment in older two-families.
Sump Pumps
Installation, replacement and battery backup for basements that take water.
Fixture Installation
Faucets, toilets, sinks, tubs, bidets, disposals, laundry hookups and outdoor spigots.
Water Filtration
Softeners and filtration — for the towns that actually need them.
Who is Colt Home Services?
Colt started in 2022 as a Mass Save Home Performance Contractor. That means years of crawling through attics and basements assessing whole houses — not just the fixture that's leaking.
It changes what we notice. A water heater that's failing early is usually telling you something about the rest of the system. We'd rather find that than sell you a tank and leave.
William Colt owns the company and lives in the Boston area. Every job runs under a Massachusetts-licensed master plumber. Nobody here reports to a fund.
Does your town need a water softener?
Half these towns need a softener. Half don't. Waltham, Newton and Watertown run on MWRA water from the Quabbin and Wachusett reservoirs — soft, and no softener required. Natick, Wayland and Dover pull from wells, and that's a different conversation entirely.
We published the whole list, town by town, so you can check before anyone quotes you equipment.
5-Year Workmanship Guarantee
We stand behind how we do the work for five years. If something fails because of our installation or repair, we come back and correct it — no labor charge.
Covers Colt's workmanship. Parts carry the manufacturer's warranty. Excludes pre-existing conditions, customer-supplied fixtures, and freeze or misuse damage. Read the full termsWhat do customers say about Colt?
We had a great experience with Colt Home Services for an energy assessment and wall insulation. The team was thorough, helpful, and did a great job. Thank you all!
Colt Home Services installed a new tankless water heater in our home in Weston, and the whole experience was great. They showed up on time, explained the options clearly, and walked us through how the new system works. The install was clean and professional, and they left the space spotless. We've had endless hot water…
Both Joe and Colt were great doing my energy and insulation audit. They couldn’t have been more professional and knowledgeable. They arrived on time and really explained all the benefits for insulation and heat pumps. I had no idea how much energy was wasted with my current setup. I really benefited from their…
Joe Frasso was amazing! he was extremely knowledgeable and helpful, especially as a first time home buyer with an older house he was able to help even further beyond his services ultimately saving me hundreds. will 100% using him again when needed.
William visited my home, and the entire process went smoothly. He was very professional and didn't use any high-pressure sales tactics. I had heard that prices for things like insulation were often inflated due to MassSave, but this company seems to operate honestly. Highly recommended!
Recent 5-star reviews from Google Maps, newest first. See every review
Our Google reviews so far are for our Mass Save energy work. Plumbing reviews will appear as our plumbing customers leave them.
Local Service Backed by Trusted Industry Partners
Colt Home Services works with established partners and programs to provide plumbing, heating, insulation, and energy efficiency solutions for homeowners in Waltham and across Greater Boston.
What do homeowners ask us most?
Plain explanations of the things we get asked about most.
Common Plumbing Problems in Older Newton MA Homes and How to Fix Them
5 Signs Your Newton MA Home Needs a Water Heater Replacement
Why Newton MA Homeowners Need Professional Drain Cleaning Services
Unclog a Toilet With Baking Soda and Vinegar
Town of Acton Partners with Colt Home Services to Expand Access to Mass Save Energy Savings
Best Energy Saving Upgrades for Older Homes in Weston and Wayland, MA
How Wellesley Homeowners Can Use Mass Save for Insulation and Air Sealing
When Do Newton Homeowners Need New Attic Insulation?
7 Signs Your Home Needs a Home Energy Audit in Newton, MA
Do you still offer Mass Save energy services?
Yes. We're a Mass Save Home Performance Contractor. No-cost home energy assessments, insulation and air sealing, with rebates and HEAT Loan financing through the Mass Save program.
Common questions
How much does a plumber cost?
The service call is free. A licensed plumber comes out, diagnoses the problem and gives you a written price before any work starts. If you go ahead with the repair, there's an $89 service fee on top of that price; if you don't, you pay nothing. Estimates for installations and replacements are free.
Are you open nights or weekends?
Not yet. We're open 8am to 8pm, Monday through Friday, and we'd rather tell you that than promise round-the-clock service and not pick up.
Are you licensed and insured?
Yes. Our plumbing work is performed under Massachusetts Plumbing Business License 1310027098-PL-C, issued by the Massachusetts Board of State Examiners of Plumbers and Gas Fitters. William Colt holds Construction Supervisor License CS-118144. We're insured through Federated Insurance.
Do you still do Mass Save work?
Yes. We're a Mass Save Home Performance Contractor and still run no-cost home energy assessments, insulation and air sealing.
