How to Write a Plumbing Scope of Work: Template & Examples

What Is a Plumbing Scope of Work — and Why It Matters

A plumbing scope of work is the written foundation of any plumbing contract. It defines exactly what the plumber will do, where they'll do it, what materials they'll use, what they won't do, and how success will be measured. Without one, both homeowners and contractors are left open to miscommunication, unexpected costs, and failed inspections.

Think of the scope of work as the rulebook for your project. Instead of simply writing "replace water heater," a proper scope of work says:

"Remove existing 40-gallon gas water heater. Install new 40-gallon gas water heater with expansion tank. Reconnect existing hot/cold supply lines using Type L copper or approved PEX. Install new gas flex connector per code. Test all connections for leaks. Obtain required permit and schedule final inspection."

That level of clarity eliminates nearly every common dispute before work even begins.

Why Both Parties Benefit

Essential Elements Every Plumbing Scope Must Include

A complete plumbing scope of work should answer seven core questions: What is being done? Where? With what materials? Who handles permits? What is excluded? What is the timeline? And what happens if something unexpected is found?

1. Project Information

Start every scope with basic identifiers:

• Property address and project description
• Homeowner and contractor names, license numbers, and contacts
• Applicable local plumbing codes (e.g., IPC, UPC, or state/local amendments)
• Reference drawings or plans (include dates/revision numbers)

2. Systems and Work Covered

List every system included, with specific task descriptions:

3. Materials Specification

Specify the pipe material type you require — the plumber can select the brand:

• Domestic water supply: PEX-A, Type L copper, or CPVC (pick one)
• DWV: PVC, ABS, or cast iron (specify if noise control is a priority)
• Shut-off valves: Full-port ball valves at all fixture stops and main shutoffs
• Fittings: No push-fit (SharkBite-style) fittings in concealed wall locations

4. What's Explicitly Excluded

Never leave exclusions to assumption. Always list them:

• Structural concrete work or slab repairs beyond direct plumbing access
• Painting or finish restoration beyond basic patching
• Fire sprinkler systems (separate trade)
• Asbestos or hazardous material handling
• Landscaping or paving restoration after exterior work

5. Timeline and Milestones

Include start date, estimated completion, and key phases:

• Day 1–2: Demolition and rough-in
• Day 3: Rough-in inspection
• Day 4–5: Fixture set and finish work
• Day 6: Final inspection and cleanup

Plumbing Scope Templates for Common Projects

Use these sample scopes as starting points. Always tailor them to your specific property, local codes, and fixture selections.

Template 1: Bathroom Remodel

Scope of Work – Bathroom Plumbing Remodel Contractor shall remove and dispose of existing sink, toilet, and tub/shower unit. Install owner-supplied toilet (model TBD), undermount sink, and faucet in existing rough-in locations. Replace supply stops and supply lines at all fixtures. Install new 1½" PVC P-trap and drain connection at lavatory. Replace tub/shower valve body with pressure-balancing valve (Moen Posi-Temp or equal). All DWV connections to remain in existing locations. Contractor to obtain plumbing permit, schedule rough-in and final inspections. Includes cleanup of plumbing debris. Excludes tile work, drywall repair, and painting.

Template 2: Water Heater Replacement

Scope of Work – Water Heater Replacement Contractor shall disconnect and remove existing 40-gallon gas water heater for disposal. Furnish and install new 40-gallon gas water heater (Bradford White or equal), including new thermal expansion tank, gas flex connector, pressure-relief valve with proper discharge piping, and isolation ball valves on hot and cold supply lines. All connections to be tested for leaks. Obtain required permit; schedule and pass final inspection. Excludes gas line upgrades beyond existing connection point.

Template 3: Kitchen Sink & Dishwasher

Scope of Work – Kitchen Plumbing Remove existing kitchen faucet and drop-in sink. Install owner-supplied undermount sink and pull-down faucet. Install new 1½" PVC drain assembly with dishwasher drain connection and disposal wiring knockout. Connect new dishwasher supply line to existing shut-off valve. Test all connections under pressure. Exclude: countertop cutout modification (by carpenter), electrical connections for dishwasher.

Template 4: Whole-House Repipe

Scope of Work – Whole-House PEX Repipe Remove all existing galvanized steel water supply piping throughout the home. Install new PEX-A water distribution system from main shut-off to all fixtures and appliances, including kitchen, (3) bathrooms, laundry, and exterior hose bibbs. All shut-off valves to be full-port ball valves. Install new pressure-reducing valve (PRV) at main. Patch drywall access holes with appropriate backing (drywall taping and painting excluded). Flush system and test to 100 PSI for minimum 15 minutes. Pull required permit; schedule and pass all inspections. Excludes DWV piping unless noted.

Handling Change Orders, Permits, and Warranties

Change Orders: Protect Yourself Before Work Starts

Change orders are written amendments that modify the original scope, price, or timeline. The most important rule: no extra work without a signed change order first. Include this language in every plumbing contract:

"Any work not specifically described in the Scope of Work is considered extra work and is not included in the contract price. Changes must be documented in a written change order signed by both parties before any additional work begins."

Common triggers for plumbing change orders:

• Hidden damage found behind walls (rotted framing, old galvanized lines, non-code venting)
• Owner-requested changes mid-project (moving a toilet, adding a hose bibb)
• Code upgrade requirements discovered during inspection
• Owner-supplied fixtures that are incompatible or missing parts

For concealed conditions specifically, include a hidden conditions clause:

"If conditions are discovered that differ materially from those reasonably anticipated — including deteriorated piping, non-compliant venting, or buried shut-offs — Contractor shall notify Owner promptly. No additional work will proceed without a signed change order covering the scope, cost, and time impact."

Understanding your plumbing warranty coverage before a project starts also helps you know what change-order repairs may be covered versus what falls under workmanship guarantees.

Permit and Inspection Language

Every scope of work should include a clear compliance statement. Use language like this:

• "All work to be performed by a licensed plumbing contractor."
• "Contractor shall obtain all required plumbing permits prior to commencement of work."
• "All work shall comply with applicable state and local plumbing codes."
• "All required rough-in and final inspections shall be scheduled and passed."

Most jurisdictions require permits for: new plumbing installation, fixture relocation, water heater replacement, gas line work, and any additions or remodels that alter supply, drain, or vent piping.

Warranty and Cleanup Language

Always include warranty and site condition terms in the scope:

"Contractor warrants all labor and materials against defects for a period of one (1) year from the date of final inspection. Manufacturer warranties on fixtures and equipment are passed through to the Owner. Contractor shall remove all plumbing-related debris and leave work areas broom-clean upon project completion."

For owner-supplied fixtures, add this protective clause: "Contractor warrants installation labor only. No warranty is provided on owner-supplied fixtures, materials, or equipment." Review what's typically covered in your plumbing warranty so you can set the right expectations in your contract.

Frequently Asked Questions

What is the difference between a plumbing scope of work and a plumbing estimate?

A plumbing estimate is a cost projection for proposed work. A scope of work is the legal description of exactly what that work entails — materials, tasks, locations, exclusions, and timelines. An estimate without a scope is just a number; it doesn't protect either party. Every estimate should be accompanied by a written scope before any contract is signed.

Do I need a scope of work for small plumbing repairs?

For repairs under $500 — like replacing a faucet or fixing a leaky trap — a brief written description in the invoice is usually sufficient. However, for any project involving permit work, fixture relocation, pipe replacement, or work costing $500 or more, a formal scope of work is strongly recommended. It protects the homeowner from scope creep and the contractor from unpaid change orders.

Can a homeowner write the scope of work, or does the contractor do it?

Either party can write it, and the best scopes are often a collaboration. Homeowners should specify visible fixtures (toilets, faucets, tub types, finishes) and material types (PEX vs. copper). Contractors should detail the technical execution — pipe routing, venting design, valve placements, and testing procedures. Both parties should review and sign the final scope before work begins.

What happens if work is needed beyond the original scope?

Any additional work must be handled through a written change order before it begins. The change order should describe the additional work, state the added cost, note any impact on the timeline, and be signed by both parties. Verbal approvals are risky — always get it in writing, even via email, and follow up with a formal change order document.

Should I specify exact fixture brands in my plumbing scope?

For visible, owner-purchased fixtures (toilets, faucets, shower trims), yes — include the exact brand and model to avoid receiving builder-grade substitutions. For behind-the-wall components like pipe, fittings, and valves, it's better to specify the type and standard (e.g., "full-port ball valves, lead-free, NSF-61 certified") and let the plumber choose the brand from approved options. This gives you quality control without restricting the contractor's ability to use trusted trade products.