John C. Flood has been serving Maryland homeowners for more than 120 years. Our licensed technicians handle everything from a tripped breaker in Bethesda to a burst pipe in Rockville to an AC that quits in the middle of a Silver Spring summer. Whatever brings you to this page, we’re here to help with clear communication, honest pricing, and a team that has earned its reputation one job at a time.
Plenty of contractors serve Maryland. Not many have been doing it for over a century. Here is what has kept customers calling us back across generations:
Maryland summers are humid and winters are cold enough to put real pressure on your heating and cooling system. John C. Flood’s certified HVAC technicians know these conditions well. Every service call starts with an in-home assessment and a clear estimate.
When your AC stops keeping up, we diagnose the problem honestly and fix it on the same day when we can. If a replacement makes more sense than a repair, we will tell you that too and help you find the right system for your home and budget.
Whether your heating system is making a noise it shouldn’t or has stopped working entirely, we identify the problem quickly and walk you through your repair and replacement options before any work begins.
Heat pumps are an increasingly popular choice for Maryland homes. We service, maintain, and install all major heat pump types, including cold-climate models built for this region’s winters.
A furnace that short-cycles, runs constantly, or makes banging noises is telling you something. Our technicians track down the cause and give you honest guidance on whether a repair or a replacement is the smarter move.
Maryland’s humidity and seasonal pollen make indoor air quality a real concern for a lot of families. We install and service whole-home air purifiers, UV filtration systems, and ventilation solutions that make a noticeable difference.
There is too much moisture in a Maryland summer and too little in winter. We install whole-home humidity control systems that keep things balanced year-round and protect your home from moisture damage.
A smart thermostat pays for itself quickly when it’s set up correctly. We help you choose the right model and install it so it communicates properly with your existing system from the first day.
Our maintenance plans include seasonal tune-ups and priority scheduling, so you catch small problems before they turn into expensive ones.
Explore our complete list of HVAC services.
Nobody calls a plumber because things are going well. When something goes wrong, you want someone who shows up on time, tells you what’s actually happening, and fixes it without selling you on work you don’t need. That’s what John C. Flood’s licensed Maryland plumbers have been doing for over a century. Financing options are available for larger jobs.
We install and test backflow prevention devices to protect your home’s water supply and keep you compliant with local codes.
We service and replace all water heater types. We will help you figure out what makes sense for your household’s hot water demand and your energy goals.
Maryland’s heavy rain seasons make a working sump pump non-negotiable for many homes. We repair and replace pumps quickly and can install battery backup systems so you stay protected even when the power goes out.
Slow drains and recurring clogs usually point to a deeper issue. We clear blockages and inspect your lines so the problem doesn’t keep coming back.
We handle garbage disposal repairs and replacements cleanly and quickly, with honest recommendations on models built to last in daily use.
Camera inspection lets us pinpoint sewer problems accurately before we dig anything up. We offer trenchless repair wherever possible to protect your yard and landscaping.
A water main break can cut off your supply and damage your foundation fast. Our plumbers use advanced equipment to locate the break and restore your water service as quickly as the job allows.
A drip that seems minor today can turn into a much bigger problem tomorrow. We assess your pipes honestly and repair or replace what needs attention before it causes real damage.
From a leaking faucet to a full fixture replacement, our plumbers handle jobs throughout your home with care and efficiency.
Gas line work is not a place to cut corners. Our licensed plumbers handle repairs, new installations, and safety inspections to code, every time.
Explore our full list of plumbing services.
Cannot be combined with any other offer or discounts. Limited time offer. Coupon must be presented at the time of the initial call. Discounts/promotions cannot be applied.
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Any Plumbing Service
Minimum of $500.00 job to be applicable. Cannot be combined with any other offer or discounts. Limited time offer. Coupon must be presented at the time of the initial call. Discounts/promotions cannot be applied.
Expires: 09/30/2024
John C. Flood’s certified electricians have been working in Maryland homes for decades. We handle everything from panel upgrades to EV charger installations, and every job starts with an in-home inspection and a clear estimate.
Older Maryland homes are frequently underequipped for today’s electrical loads. We inspect your panel, explain what needs to change, and upgrade or replace it to bring your home safely up to current code.
Aluminum wiring, knob-and-tube systems, and other aging electrical infrastructure are common in the region’s older housing stock. Our electricians assess the situation fully and complete rewiring with minimal disruption to your home.
We install Level 2 home EV chargers for all major vehicle brands, handling the dedicated circuit, the installation, and post-install testing so everything works correctly from the start.
Maryland storms can knock out power for hours or days. A standby generator from John C. Flood turns on automatically the moment the grid goes down, keeping your lights, HVAC, and essential systems running.
Whether you’re buying a home, renovating, or just want peace of mind, our electricians give you an honest, thorough picture of your electrical system.
We add outlets in areas of your home where power is hard to reach and install GFCI protection in kitchens, bathrooms, and garages. Small jobs get the same attention as larger ones.
Recessed lighting, exterior fixtures, under-cabinet lighting, and more. We wire and install everything correctly the first time so it looks the way you pictured and works safely for years.
One voltage spike can damage thousands of dollars worth of appliances and electronics. A whole-home surge protector is an affordable safeguard that protects everything connected to your system.
From a leaking faucet to a full fixture replacement, our plumbers handle jobs throughout your home with care and efficiency.
Gas line work is not a place to cut corners. Our licensed plumbers handle repairs, new installations, and safety inspections to code, every time.
Explore our complete list of electrical services.
John C. Flood has served homeowners across Maryland for more than a century. Our service area includes:
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We serve communities throughout Maryland, including Bethesda, Silver Spring, Rockville, Chevy Chase, Gaithersburg, Germantown, Potomac, and many of the surrounding areas. Check the list above or give us a call. We can confirm your location in about thirty seconds.
Our call center is available 24 hours a day, 7 days a week. For urgent plumbing needs, we do our best to get a technician out the same day during business hours. Anything reported overnight gets noted and scheduled for first-call availability the next morning. For non-emergency work, we offer flexible scheduling seven days a week at flat rates.
We have been in these neighborhoods for over 120 years, long enough that some of the homeowners we work with today grew up watching us fix their parents’ homes. That kind of history keeps us honest. We give you a straight answer, price the work upfront, and back everything we do. We are also active in the Maryland and DMV community because we are not just working here, we live here too.
