Should I hire a plumber to replace my kitchen sink?
Not always. Swapping a drop-in sink for one the same size, with the drain in the same place, is a job many homeowners handle. Hire a plumber when the drain or supply has to move, the old trap is an S-trap or corroded metal, the sink is undermount or farmhouse, or the countertop needs cutting. Anyone you hire to do the plumbing must hold a Virginia plumbing licence.
Free to ask. Local shops send quotes, and you pay only when you book one.
By Kasra Taheri, Founder, LoclisPublished
Researched and drafted with AI, then checked claim by claim against the sources listed below before it was published. Prices and rules change; the dates beside each source say when it was last checked.
Step by step
Read when to stop and call a pro, further down this page, before you start.
Step 1: Identify the mounting
Check whether your sink sits on top of the counter with a visible rim (drop-in) or is fixed under it (undermount).
Step 2: Measure the sink and cutout
Measure the old sink's width and front-to-back length and compare them with the new sink, because the countertop hole has to match.[1]
Step 3: Compare the drain position
Check whether the new sink's drain sits in the same spot as the old one; a different position can mean new trap parts or moving the drain.
Step 4: Look at the trap
Note whether the drain under the sink is a P-trap into the wall or an S-trap through the floor, and whether it is plastic or old metal.
Step 5: Test the shutoffs
Close and reopen both shutoff valves under the sink to make sure they stop the water before anyone starts work.
Step 6: Decide what you will do
Keep the job yourself only if it is a same-size, same-drain swap; otherwise list what needs a plumber, countertop fabricator or electrician.
Step 7: Get written quotes
Ask for at least three written bids for the same work so you can compare prices and contractors.[9]
Step 8: Verify the licence
Check each plumbing business on DPOR's License Lookup or call (804) 367-8511 before you accept a quote.[9]
You do not always need a plumber to replace a kitchen sink. If the new sink drops into the same countertop hole and its drain lands in the same place, the job is mostly lifting, sealing and reconnecting, and many homeowners do it themselves. A plumber earns the fee when the drain or water supply has to move, when what is under the sink is old, corroded or not to code, or when the sink type changes. Countertop cutting is a separate trade again.
When a homeowner can handle it
A drop-in sink replaced with one the same size. Drop-in sinks, also called overmount or self-rimming sinks, sit in a pre-cut hole in the countertop with a visible lip over the edge, and Moen describes them as designed for an easy installation.[1] Matching the size is what keeps it easy. Standard kitchen sink sizes are 25" X 22" for a single bowl kitchen sink and 33" X 22" for a double bowl kitchen sink.[1] When you shop, consider the length, width, depth and shape of the existing hole.[1]
The drain stays put. Moen sells sinks with center and rear drain positions to suit a garbage disposal, the plumbing or simple preference.[1] A new sink with the drain in the same spot usually reconnects to the same trap. If the position changes, the trap pieces under it often need replacing too. That part is manageable: Oatey says "Most DIYers can install or replace a P-trap in about 30–45 minutes using a standard slip-joint P-trap kit and basic hand tools."[2] For sizing, most kitchen sinks use a 1-1/2 inch trap.[2]
The new strainer is sealed properly. The basket strainer that sits in the sink's drain hole needs a seal. "Plumber's putty is used to form a water tight seal between the sink and the faucet and between the sink and the drain."[3] Some strainers come with a gasket instead; follow the one that comes in the box.
The shutoffs work. You will disconnect the faucet supply lines to lift the old sink out, so the valves under the sink have to close fully.
In a house you own and live in, Virginia's contractor licensing law lets you do this work yourself. The chapter does not apply to "Any person who performs or supervises the construction, removal, repair, or improvement of no more than one primary residence owned by him and for his own use during any 24-month period".[5] The same section says an owner working under that exemption must still comply with the Uniform Statewide Building Code.[5]
When to hire a plumber
The sink moves, or the piping changes. The building code's permit exemption covers "Replacement of plumbing fixtures and well pumps in all groups without alteration of the water supply and distribution systems, sanitary drainage systems, or vent systems."[4] Move the sink, extend the drain or add a water line, and a permit is required for installations or alterations involving the water supply and distribution system, sanitary drainage system, or vent system.[4] A plumber can pull that permit and get it inspected. Even a straight swap has one exception in the same section: "Application for a permit may be required by the building official for any items exempted in this section that are located in a special flood hazard area."[4] If your home is in a mapped flood zone, ask the local building department first.
The trap goes through the floor. An S-trap drops through the floor and can siphon dry, allowing sewer gas into the home, so it is often not code-compliant.[2] Converting it to a P-trap can mean changing the drain and venting behind the cabinet, which counts as altering the drainage system, so it needs a permit[4] and is usually work for a plumber rather than part of a sink swap.
The drain or supply pipe is old metal. On older chrome or galvanized drains, if old metal fittings are severely corroded, replacement may be the safest option.[2] Corroded pipe in the wall can break when it is disturbed, and a plumber is the person to have there when it does.
The sink type changes. Undermount sinks are mounted to the underside of the countertop.[1] Farmhouse, or apron, sinks are large sinks with an exposed front, installed as undermount, drop-in or flush with the countertop.[1] Both usually mean changing the countertop cutout, and a farmhouse sink often means altering the cabinet. On stone or quartz, that work belongs to the countertop fabricator; the plumber reconnects afterwards.
The disposal is hard-wired. A plug-in disposal is simple to reconnect. One wired into a junction box is electrical work.
Choosing the sink
If you are replacing a stainless sink, the gauge matters for how it wears: the lower the gauge number, the thicker the steel, and thicker steel is less prone to denting, bowing and noise.[1] Check the number of faucet holes too, so your faucet fits or you know you are buying a new one at the same time. For that part of the job, see how to replace a kitchen faucet.
When you hire someone
Two kinds of licence matter when you hire. Anyone you hire to do the plumbing needs a licence of their own: DPOR's Board for Contractors regulates individual tradesmen in plumbing, electrical, HVAC and gas fitting, and says that state certification of these trades is mandatory, not optional.[8] The business may need a contractor licence as well. The Code's general rule is: "No person shall engage in, or offer to engage in, contracting work in the Commonwealth unless he has been licensed under the provisions of this chapter."[7] Under its definitions, a Class C contractor licence covers a single contract or project over $1,000 but less than $30,000.[6] Ask each business for its contractor licence number and the plumber's own tradesman licence number, and check both.
Get it in writing. "Virginia law requires all licensed contractors to provide a written contract for residential work."[9] Sink jobs often split between trades, so the Board's advice applies directly: "If you intend to do some of the work yourself or hire another contractor to do it, this also should be written into the contract."[9] Keep the deposit to an initial deposit of no more than 10% of the total price or $1,000, whichever is less.[9]
Stop and call a pro if
- A shutoff valve will not close, or the only way to stop the water is the main valve.
- The drain pipe in the wall moves, cracks or crumbles when you loosen the trap.
- You find rot or soft wood in the cabinet floor or under the countertop edge.
- The new sink does not fit the hole, or the countertop would have to be cut.
- The disposal is hard-wired, or there is any wiring under the sink beyond a plug-in cord. Disconnecting or reconnecting a junction box is electrical work.
- Water keeps appearing after the new sink is in. See why water leaks under a kitchen sink to find the joint.
Hiring on Loclis
Loclis accepts plumbing quotes only from licensed businesses, and its directory shows each one's DPOR licence number and class. Find plumbers in Blacksburg, browse faucet and sink pros, or read more plumbing answers.
If the sink swap is more than you want to take on, describe the sink job once and licensed local plumbers quote it.
Common questions
- Do I need a permit to replace a kitchen sink in Virginia?
- Usually not for a straight replacement. The Uniform Statewide Building Code exempts replacing plumbing fixtures when the water supply, drainage and vent piping are not altered, though the building official may require a permit for exempted work in a special flood hazard area. Moving the sink, or changing the drain or supply piping, needs a permit.
- Can I replace a kitchen sink myself in a house I own?
- Usually yes. Virginia's contractor licensing law exempts an owner working on one primary residence they own and live in, within a 24-month period, but the work must still meet the Uniform Statewide Building Code.
- Who installs an undermount sink in a granite or quartz counter?
- Usually the countertop fabricator or installer, because the sink is fixed to the underside of the stone and the cutout is part of the countertop. A plumber then connects the faucet, drain and disposal. Ask who is responsible for each part in writing.
- What does a plumber do on a sink replacement that I cannot?
- Mostly the work that changes the piping: moving the drain, converting an S-trap, or replacing corroded drain or supply pipe. Altering the water supply, drainage or vent system needs a permit under the building code. An owner may do that work on a home they own and live in, with the permit, but this is usually where a sink swap becomes a job for a plumber, who can also pull the permit.
- Does the garbage disposal complicate the job?
- It can. The disposal has to come off the old sink and mount to the new one, and its wiring is electrical work if it is hard-wired rather than plugged in. A sink with a different drain position may also need new drain parts to reach the disposal.
Sources
- [1] Sinks: Material, Styles and Mounting, Moen. Checked October 26, 2026.
- [2] How to Install a P-Trap, Oatey. Checked October 26, 2026.
- [3] When do I need to use thread seal tape, pipe dome or plumber's putty?, Moen. Checked October 26, 2026.
- [4] 13VAC5-63-80. Section 108 Application for permit (Virginia Uniform Statewide Building Code), Virginia Administrative Code, Virginia General Assembly. Checked October 26, 2026.
- [5] Code of Virginia § 54.1-1101. Exemptions; failure to obtain certificate of occupancy; penalties, Code of Virginia, Virginia General Assembly. Checked October 26, 2026.
- [6] Code of Virginia § 54.1-1100. Definitions, Code of Virginia, Virginia General Assembly. Checked October 26, 2026.
- [7] Code of Virginia § 54.1-1103. Necessity for license, Code of Virginia, Virginia General Assembly. Checked October 26, 2026.
- [8] Tradesmen Program, Virginia Department of Professional and Occupational Regulation. Checked October 26, 2026.
- [9] What You Should Know Before You Hire a Contractor, Virginia Board for Contractors, DPOR. Checked October 26, 2026.
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