Plumbing in Fairfax County

Permits, current fees, inspections, and what you need to know when the water heater fails or the basement drain backs up.

We've dated every figure we gathered. A published fee may differ from your final permit bill. Where we could not settle something, we say so.

Do you actually need a permit?

You need a permit to add or move plumbing. Fairfax's residential guidance covers sinks, showers, toilets, hose bibs, wet bars, water heaters and sewer or water connections. Moving your toilet during a bathroom renovation differs from replacing it without changing the plumbing systems.

Virginia exempts replacement plumbing fixtures from permits when you do not alter the water supply, drainage or vent systems. Replacing a fixture does not automatically mean you need a remodel permit. Calling a remodel a replacement does not exempt its new piping.

You need a permit to replace a gas water heater, even like-for-like. For appliance installations without new gas piping, Fairfax directs you to its Household Appliance record, abbreviated HAPL. If you're adding gas piping, use the Residential Plumbing record, PLBR, instead.

The electric-appliance wording needs care. The county's general permit guidance broadly lists direct appliance replacements as needing permits. Its more specific appliance guidance acknowledges a state exemption in the specified residential occupancies. That exemption covers replacement mechanical appliances not fuelled by gas or oil. We follow that specific exemption. We cannot say an electric water-heater job is exempt if you change piping or wiring. Confirm your scope with LDS at 703-222-0801.

In an emergency, Virginia lets you start construction or replace equipment before applying for a permit. You must apply by the end of the next working day. You get extra time to file, not a permanent waiver.

Source: Fairfax County Land Development Services (LDS), Does My Project Require a Permit? and Household Appliance (HAPL) — Residential, undated guidance; Virginia Board of Housing and Community Development, 13VAC5-63-80, sections 108.1 and 108.2, current text, latest listed amendment effective 2024-01-18. Gathered 2026-09-22.

What the permit costs

The adopted Appendix Q effective July 1, 2026 lists these charges. These are scheduled fees before surcharges. They are not prices for installed plumbing.

The fixture bands set your total scheduled plumbing installation fee. You do not pay that amount for each fixture.

We cannot give you a confirmed total. Appendix Q describes technology charges by transaction. It describes the academy levy by building-development fee. It gives no worked example showing whether the technology charge applies to the levy. We can only report the published components separately. You can confirm the final calculation with LDS at 703-222-0801. Your fee assessment in PLUS is the bill for your job.

The county says the revised fees apply to applications submitted after the July deadline. If you applied earlier, the fees from your filing date still apply.

Source: Fairfax County Board of Supervisors, adopted Appendix Q, Land Development Services Fee Schedule, sections I-A, I-E, I-F and III, adopted 2026-05-05, effective 2026-07-01; Fairfax County LDS, Zoning and Land Development Fees Increase on July 1, issued 2026-05-28. Gathered 2026-09-22.

How long the permit actually takes

For an eligible HAPL application, supply the required information. Pay the fees. The permit is then issued automatically. Fairfax says it does not review these applications. That does not promise you an installation appointment. You still need the inspection.

A PLBR application can take a different route. Fairfax may review it through the Permit Application Center and Wastewater. For property on well or septic, the Health Department may also review it. If your plumbing appears on approved building plans, reference the parent building permit in your application. Otherwise, you may need drawings. You need a supporting letter for an ejector or grinder pump serving a home on county public sewer.

The county's metrics guidance describes checking applications for completeness within one business day. It generally routes them to technical review within another business day. Those are processing stages. They do not promise when you'll get your permit. Review queues, corrections and work by outside agencies can add to your wait.

We could not verify a county-specific median wait for residential plumbing repair permits, from application to issue. We cannot give you a reliable estimate. The published building-review metrics expressly exclude some time spent on reviews by outside agencies. They do not show your whole wait.

For an existing application, check the PLUS Workflow Routing Slip for its review history and assigned staff. It tells you more than assuming a stalled permit is waiting for a plumber's licence check.

Source: Fairfax County LDS, HAPL permit guide, PLBR permit guide, and Land Development Metrics, undated live guidance. Gathered 2026-09-22; queue conditions can change.

The inspections

Fairfax's residential plumbing inspection report lists concealment, groundworks, water service, sanitary sewer connections, shower-pan testing and final plumbing. It also lists gas and sewer-documentation checks. Your repair may not need every inspection. A HAPL job has one inspection.

For a bathroom project, find out which inspections you need before you close walls or cover the shower assembly. The county's report lists the shower-pan test separately from final plumbing. A finished bathroom does not replace records of work you've covered up.

Request inspections through PLUS before 11:59 p.m. if you want the next business day. Availability still matters. Fairfax emails the applicant and site contacts on inspection morning. The email gives a two-hour arrival window, plus the inspector's name and phone number. The county sends the result afterwards.

Book related concealment or final inspections together for the same day under the county's combination-inspection process. If you do not coordinate the trades, the inspection can fail. You can also face a reinspection charge. To change a booking, cancel it first. Make a new request.

You need specific records for trenchless sewer work. Pipe bursting requires a sewer video. Approved cured-in-place lining requires videos before and after installation. Upload them to the plumbing record. They must be approved before you can pass final inspection. Put who will submit them in your repair scope.

Source: Fairfax County LDS, Residential Plumbing Inspection Report, third-party program form; Building and Trade Inspections; and HAPL permit guide, undated guidance. Gathered 2026-09-22.

What the inspector is actually going to check

You can discuss these requirements before installation. They are not a complete inspection checklist. We are not claiming these are Fairfax's most frequent failures.

The old chimney still matters when you replace a gas water heater. Fairfax's Vent/Chimney Certification requires confirmation that the vent is properly sized and built. It must be unobstructed, free of defects or deterioration, and working. The form identifies the certifier, company and Virginia contractor licence. For a household-appliance permit issued in PLUS, upload the certification to the record. A new tank does not prove the existing exhaust path is acceptable.

You need a suitable pan where a tank leak could cause damage. Virginia's residential amendment requires one wherever a storage-type heater could cause damage by leaking. It specifically prohibits a plastic pan beneath a gas-fired water heater. Your replacement's location matters, even if the old tank sat there without a pan.

You must be able to locate a buried plastic water service. The residential amendment requires insulated copper tracer wire of at least 18 AWG, or an equivalent product. It must be suitable for burial. Put it in the same trench, within 12 inches of the pipe. Its end must be accessible above ground. Settle this before you backfill.

Quick-closing valves need water-hammer protection unless otherwise approved. Virginia's amendment requires an arrestor fitted to its manufacturer's specifications. If your pipes bang, have the installation checked. Do not assume you have to live with the noise because your house is older.

Backflow assemblies need testing throughout their life. Fairfax requires certified testing when you install, repair or move an assembly. You also need it tested annually. If an assembly fails, complete these steps within 10 business days. Have it repaired or replaced. Get it retested. Your property's tax-map grid determines when annual testing is due. This applies to backflow prevention assemblies. It does not mean every household tap needs an annual inspection.

Source: Fairfax County LDS, Vent/Chimney Certification, revised 2022-01-26; Virginia Board of Housing and Community Development, 13VAC5-63-210, residential amendments P2602.3, P2801.6 and P2903.5, 2021 code cycle effective 2024-01-18; Fairfax County LDS, Requirements and Responsibilities for Installation and Testing, undated. Gathered 2026-09-22.

Who is allowed to do the work

Check the business's licence separately from the individual's trade credentials. Fairfax explains that contractor licences carry classifications and specialities. Individual tradesman credentials are separate. A licence for an unrelated type of construction does not authorise plumbing work.

Virginia's DPOR regulates plumbing and gas-fitting trades. Since April 1, 2025, it has also offered a Residential Plumbing license restricted to residential structures. Check what the credential covers. Check that it is current. Do not assume every legitimate licence must have the same title.

Fairfax recommends that you have the licensed contractor get the permit. The county says it is harder to enforce rules against a contractor when you hold the permit yourself. If you're doing work exempt from licensing, use the county's License Exemption Affidavit when appropriate. An owner permit does not prove that a business you've hired is properly licensed.

The county also requires a local Home Improvement Contractor license for Class C contractors and contractors below the state licensing threshold. You can ask the county's permit staff which local requirements apply to a firm's work. A state licence lookup does not complete your local registration checks.

Before you accept a quote, match the business name on the contract to its licence record. Settle who will get the permit. Agree who will arrange inspections. Decide who will deal with corrections. Put those responsibilities in writing.

Source: Fairfax County LDS, Hiring a Contractor, HIC license guide, and License Exemption Affidavit information sheet, information sheet dated 2022-01-31; Virginia DPOR, Tradesmen Program, residential-license change effective 2025-04-01. Other guidance undated. Gathered 2026-09-22.

Which code your job is held to

The published code family that applies is the 2021 Virginia Uniform Statewide Building Code, effective January 18, 2024. Fairfax's adoption bulletin explains the change from the previous edition. The transition period ended in January 2025.

For house plumbing, the Virginia Residential Code and its plumbing provisions matter. Other residential buildings can fall under the Virginia Construction Code and referenced Plumbing Code. Gas appliances bring fuel-gas provisions into your job. Alterations to existing buildings can involve the Existing Building Code. Which rules apply depends on your building's classification and the work you're doing.

An outdated county introduction is still online. Fairfax's Codes and Standards page still says the statewide codes reference the 2018 International Codes. Its specific adoption bulletin and Virginia DHCD's code publications identify the 2021 edition. We follow those specific adoption sources. You can check the state documents in the DHCD regulations archive.

An old installation may be assessed differently from new replacement work. Ask which requirement calls for a proposed change. This matters particularly if your quote includes vent work, a drain pan or changes to buried service piping.

Source: Fairfax County LDS, Technical Bulletin 23-07, Adoption of the 2021 Virginia USBC, code effective 2024-01-18; Codes and Standards, undated; Virginia DHCD, 2021 Code Development Cycle and Virginia Building and Fire Regulations. Gathered 2026-09-22.

What Fairfax County houses are, and what goes wrong in them

Where your meter sits can change how you investigate a leak in an older house. Fairfax Water says most houses built between 1971 and 1980 have an inside meter connected to an outside remote register. For those installations, the utility maintains the meter and remote reader. An outside register does not prove your actual meter is outside. Nor does it prove that every pipe that looks upstream belongs to the utility.

Fairfax Water says household service laterals can be copper, plastic or a combination. Find out what your pipe is made of. Check where your responsibility ends. The date your house was built does not prove what pipe is in the ground now.

If your bill jumps unexpectedly, toilets are the utility's first suspect. Fairfax Water identifies leaking toilets as its most common source of leaks. For its dye test, flush first. Wait five minutes. Add dye to the tank. Wait 15 minutes without flushing. Colour reaching the bowl shows a leak. The utility lists flappers, lift mechanisms, excess tank level and deteriorated float components as possible causes.

If your meter is outside, the utility suggests this test for an underground service leak. Close your house's main valve. Check that water stops flowing at a tap. Check whether the meter still registers water. If it keeps moving, that points to a leak between the valve and meter. This test assumes your meter is outside. That matters if yours is indoors.

Unused basement fixtures can explain sewer odours. County Wastewater guidance says evaporated trap water can cause them. Blocked roof vents are another possible cause. An odour alone does not prove you need to replace the buried lateral. If clogs or backups keep returning, have the line's condition checked.

We could not find a verified countywide count of homes with Orangeburg, polybutylene or failing copper plumbing in the primary sources reviewed. We could not verify how homes were distributed by age, either. We cannot assign a pipe problem to a whole subdivision on that evidence. A utility's observation is not a census statistic.

Source: Fairfax Water, Your Plumbing and Detecting Leaks; Fairfax County Department of Public Works and Environmental Services (DPWES), Residential Wastewater Management, all undated guidance. The meter-era statement concerns Fairfax Water's service area, not a count of all county homes. Gathered 2026-09-22.

A sewer backup: whose pipe, whose repair?

Sewage rising when nobody in your house is using water can point to a public-main problem. Fairfax's wastewater office distinguishes this from a backup when you use household fixtures. That may point to a private-line blockage. Neither tells you the cause for certain.

If you suspect a county-main backup, the county's emergency number is 703-323-1211. It is staffed 24 hours. The response staff check the public sewer. Avoid sending more water down your drains until the blockage is cleared.

You are responsible for the entire private lateral to the public sewer connection. That includes sections beneath public easements or roads. A break beyond your property line does not automatically become the county's repair. Fairfax requires a plumbing permit for lateral repairs. You also need a VDOT permit for work in the public right of way.

Make sure your repair estimate reflects that boundary. Identify the failed section. Agree how workers will reach it. Specify how they will excavate or line the pipe. Settle who gets the permits. Agree what will be put back afterwards. For trenchless work, include who submits the county's videos. Include the county's requirements for final approval too.

If your house is on septic, different maintenance rules apply. Fairfax requires qualifying onsite-system tanks to be pumped at least once every five years. Its guidance specifies systems that do not need a Virginia Pollutant Discharge Elimination System permit. Contractors record pump-outs in PLUS. The Health Department oversees onsite-system permits and inspections. You can check your property's requirements with them at 703-246-2201. Clearing an indoor blockage does not prove your tank and disposal field work properly.

Source: Fairfax County DPWES, Wastewater Construction and Maintenance and Residential Wastewater Management; Fairfax County Health Department, Onsite Sewage Disposal and Private Well Water Systems, citing County Code Chapter 68.1. Undated guidance; no effective date stated for the pump-out provision on the guidance page. Gathered 2026-09-22.

What the work is worth

We could not find verified county-specific installed-price data for water-heater replacements, bathroom repiping or sewer-lateral repairs. The primary sources we reviewed do not support a reliable local price range.

Compare what each written quote covers: equipment, piping changes, vent certification, permits, inspection corrections, access and restoration. A permit schedule tells you the government's charge. It does not tell you the plumber's labour rate or your finished repair price. Do not price a sewer connection problem and a leaking toilet from the same generic “plumbing repair” average.

For a replacement heater, compare how the proposals cover vent certification. For a lateral, compare where the repair starts and ends. Check how each quote covers the video requirements. You cannot directly compare a low total that leaves these responsibilities out with a proposal that includes them.

Source: Fairfax County LDS, Vent/Chimney Certification, revised 2022-01-26, and Building and Trade Inspections, undated; DPWES, Residential Wastewater Management, undated. These establish scope requirements, not market prices. Gathered 2026-09-22.