Banging pipes when the dishwasher stops
A hammer in the wall when the dishwasher or washer cuts off is the old pipe taking a jolt. In a 1960s house, it may mean the pressure is above the 80 psi line, or that the house never had a valve to damp it.
Annandale, Virginia
Water pressure and pressure reducing valve replacement in Annandale.
In Annandale, a pressure reducing valve replaced is $500 to $1,000. Call SwiftPro, rated 5.0 stars across 1,130 reviews, at (703) 997-9757, 24 hours a day, 7 days a week.
SwiftPro’s plumbers in Annandale are rated 5.0 stars across 1,130 reviews and work under Virginia Class A contractor license 2705192276. Water pressure and PRV replacement in Annandale, Wakefield and Canterbury Woods, where many 1960s ranches have an old valve, a gate valve or nothing at the main. If the pressure is fine and the trouble is a hidden leak, finding it is $200 to $500. A main shutoff valve is priced at your house, once we’ve seen the pipe it’s on.
- A gauge reading before the price
- Our own licensed plumbers
- Set and tested before we leave
5.0 stars across 1,130 reviews
New copper supply piping with red-handled shutoff valves, installed and tagged by one of our plumbers.
Get your price in writing
Send this and the office calls or texts you back to set a time.
We’ll call or text this number about your request. By sending it you agree to our terms and privacy policy.
Rather talk now? (703) 997-9757
Licensed and insuredVirginia Class A contractor #2705192276
24/7 emergency serviceWe answer day or night, and we will tell you honestly when we can get there.
Our own plumbers, our own trucksNobody here is a subcontractor with a magnet on the door
The price is settled before the workYou see the number in writing before anything is taken apart
What it costs
What a pressure reducing valve costs in Annandale.
From the same price book as our plumbing price list: the valve, the fittings, setting it with a gauge and checking the house afterward. More on what causes it in our low water pressure guide.
Pressure reducing valve replacement
$500 to $1,000
Leak detection
$200 to $500
Prices checked .
Where you land in the range is mostly where the valve sits and what it’s attached to: a valve right at the main shutoff in an open basement is the easy end, one behind a finished wall or on corroded pipe is the other.
When a new valve brings the pressure down, the water heater can no longer push its expansion back into the street, so we check for an expansion tank on the same visit and tell you if the house needs one.
What’s different in Annandale
In Annandale, the first question is whether the 1960s house ever had a valve.
Eight in ten Annandale homes predate 1980, and the median owner home is from 1967. In a house that old the water line can enter three ways: with a reducing valve, with only a plain shutoff, or with a valve somebody put in once and nobody has touched since. All three look different from the outside, and a quick look at the pipe past the meter tells us which.
The plain shutoff is the one that fools people. An old gate valve at the wall, round handle and all, only turns the water on and off. It does nothing about pressure. The regulator is the bell-shaped brass body with a bolt or screw on top, and Fairfax Water leaves it to the owner. The utility promises 20 psi at the main and no steady upper figure, so in a house with no regulator, your fixtures see whatever the street is sending.
That’s why it pays to check in the Wakefield Chapel sector and Canterbury Woods, mostly detached ranches and split levels, where the furnace and water heater sit in a basement the previous owners finished. A regulator that was added in the 1990s may be behind a paneled wall, with a small access door or none. If the faucets thump and you can’t find a bell anywhere, it’s worth tracing the main before assuming the house has one.
Three in ten Annandale homes are rented, and Woodburn and the streets around Little River Turnpike and Columbia Pike have garden apartments and condos. A tenant who hears banging pipes can ask the owner to have a plumber read the pressure; that’s the owner’s repair. In a condo building, a valve at the base of the riser is the association’s, and the one after your unit’s shutoff is yours.
Neighborhood by neighborhood
What a pressure problem looks like across Annandale.
Census figures for the owner-occupied homes in each place, and what usually sits at the main shutoff in houses like them.
| Place | Median home built | Most homes are | Heated with | What’s usually at the main shutoff |
|---|---|---|---|---|
| Annandale | 1967 | single-family houses, about 5 in 10 | gas, about 7 in 10 | An old gate valve, often no reducing valve. |
| Wakefield | 1968 | single-family houses, nearly all | gas, about 8 in 10 | An old gate valve, often no reducing valve. |
| Woodburn | 1968 | single-family houses, about 4 in 10 | gas, about 6 in 10 | An old gate valve, often no reducing valve. |
By the numbers
Annandale houses, by the numbers
From the Census Bureau’s 2020 to 2024 survey. Median year built and heat count owner-occupied homes only.
Annandale
- Built before 1980about 8 in 10 Census
- Built since 2000about 1 in 10 Census
- Most homes aresingle-family houses, about 5 in 10 Census
- Heated withgas, about 7 in 10 Census
- Rentedabout 3 in 10 Census
- Houses from before 1980 often have no reducing valve at all, or one that was added later, and the main shutoff is often an old gate valve that won’t fully close.
- Most homes here are detached houses, each with its own meter and its own valve, usually in the basement or crawlspace where the line comes in.
The signs
When a Annandale house has a pressure problem.
Pipes bang when a faucet shuts
A thud in the wall when the washer or a faucet closes is water hammer, and high pressure makes it worse. So does a toilet that keeps refilling, or faucets that drip no matter how many washers go in.
The pressure dropped and stayed low
When every faucet in the house went weak at once, the valve at the main is the first suspect. They wear out and can fail closed, and a stuck valve feels exactly like the water company turned you down.
Need water pressure and pressure reducing valves in Annandale?
A person answers day and night. See this month’s deals before you call.
Choosing who fixes it
How to pick who fixes water pressure in Annandale.
Questions to ask anybody who quotes you a valve, us included.
Will they tell the gate valve from the reducing valve?
In an Annandale ranch, a plumber who points to the right brass body, and says if it’s missing, is reading the house correctly. One who sells a replacement without finding it first isn’t.
Did they put a gauge on it before the price?
A valve quoted without a pressure reading is a guess. Ask what the house reads now, static and with water running, and what they’ll set it to.
Did they ask about the water heater?
A new valve changes how the water heater handles expansion. The plumber who checks for an expansion tank is the one who saves you a dripping relief valve next month.
Two of our crew going over a work order before the day's calls.
From our Google reviews
What our customers say.
5.0 stars across 1,130 reviews. Read them on our reviews page.
Polite, courteous, professional, and without any hard sell pressures.
- 5.0stars across 1,130 reviewsHow we count them
- ABBB Accredited, A ratingCheck it on bbb.org
- 2026Voted a Nextdoor Neighborhood Faves winner two years running: 2026 in 30 Northern Virginia neighborhoods, 2025 in Emerald Chase (Herndon) and Hunters Run (Chantilly)See it on Nextdoor
- #1BusinessRate Best of 2026: the top-ranked heating contractor in Fairfax, VirginiaSee our BusinessRate score
- Class AVirginia contractor, license #2705192276Look it up with DPOR
Where we work
Water pressure and pressure reducing valves in every Northern Virginia town we serve
Next door to Annandale: Falls Church, Springfield, Burke, Oakton and McLean.
Fairfax County
Arlington County
Loudoun County
Prince William County
Fauquier County
Stafford County
Every town on one page
Questions
Water pressure questions from Annandale.
Does my Annandale house need a pressure reducing valve?
If a gauge on the hose bib reads over 80 psi, the Virginia Residential Code calls for one. Under that, the valve is your choice, but anything toward the top of the 50 to 70 range is hard on a 1960s house.
I rent in Annandale and my pipes bang. Who pays for the valve?
The owner does. The valve is part of the house’s plumbing. Send your landlord the reading from a hose bib gauge and a short note, and they have what they need to book the repair.
How much is a pressure reducing valve replacement in Annandale?
$500 to $1,000, with the valve, the fittings and setting it with a gauge in that number. Where you land depends on where the valve sits and the pipe it’s on.
What should my water pressure be?
Most houses run well somewhere around 50 to 70 psi. The Virginia Residential Code calls for a reducing valve once the street pressure tops 80 psi. We read it with a gauge on a hose bib so you know your own number.
Ready when you are
Find out what the pressure really is.
Call, or send the form at the top. We put a gauge on the house, show you the number, and you get the price in writing before any valve comes out.
SwiftPro Heating, Cooling & Plumbing
4230 Lafayette Center Dr N, Chantilly, VA 20151
44679 Endicott Dr, Suite 211, Ashburn, VA 20147
SwiftPro Plumber & Water Heaters
4200 Lafayette Center Dr, Suite N, Chantilly, VA 20151
Virginia Class A contractor license #2705192276
SwiftPro Heating, Cooling & Plumbing is a licensed, BBB Accredited (A rating), independently owned heating, cooling and plumbing company in Chantilly, serving Annandale and the rest of Northern Virginia. Virginia contractor license #2705192276. 5.0 stars across 1,130 reviews on Google, Angi, Yelp, the BBB and Facebook. SwiftPro maintains a dedicated HVAC team and a dedicated plumbing team.
From SwiftPro Heating, Cooling & Plumbing in Chantilly. Housing figures are the Census Bureau’s American Community Survey, 2020 to 2024, for each place named; permit, water and sewer facts link to each office’s own page and were checked in September and October 2026.