Plumbing Insurance in Delaware: $147/mo benchmark

Delaware’s plumbing board doesn’t set a general liability or bond minimum we could find for master plumbers. Almost every employer with one or more employees must carry workers’ comp. Here’s what to have ready before you ask for quotes.

Which policies should a Delaware plumber compare?

A leak can damage a customer’s property during a repair or after you have packed up your tools. General liability helps address covered injury and property damage claims. Discuss products and completed operations so you understand protection for the work you leave behind.

Describe drain cleaning, gas piping, excavation, water heaters, backflow testing and commercial projects where applicable. Ask how the policy treats damage caused by faulty work and the cost of correcting the work itself.

These are separate coverage needs. Available products and terms depend on your work, location and insurer; a liability quote does not automatically include every policy above.

Match coverage to the risk

Risk	What to ask about
A leak, flood or sewer backup damages a customer’s property, during or after a job	General liability that meets any license or contract limits, including products and completed operations. Ask how it handles water damage, mold, work in occupied homes and any exclusions for the kind of work you do.
An employee gets hurt	Workers’ comp under Delaware’s rules. Give accurate payroll and job duties, and explain how you use subcontractors.
Your van or truck	Commercial auto for business use, the vehicles and everyone who drives them. General liability doesn’t cover your vehicle, and a personal auto policy may not cover a work van.
Tools, drain cameras, jetters and equipment	Tools and equipment (inland marine) coverage. Ask about theft from a vehicle, tools left on site overnight, rented equipment and deductibles.
A shop, stock or bigger contracts	Property coverage or a business owner’s policy, plus umbrella coverage if a contract asks for higher limits.

Describe the work you actually do

Tell the insurer whether you do service and repair calls, drain cleaning, sewer line work, excavation or trenching, gas piping, water heaters, backflow testing, new construction or commercial work. Mention subcontractors and any work in occupied buildings. A quote built on a narrower description, such as “handyman,” may not cover the jobs you take.

Ask what happens when your own work fails. Liability insurance isn’t a warranty. Fixing a bad joint and paying for the water damage it caused are often treated differently. Ask the agent to walk you through it.

Get your proof of insurance ready for customers

Start with your current agent or insurer. Get each customer’s liability limits in writing and check applicable local licensing requirements; the absence of an identified master-plumber licensing minimum does not settle those separate obligations. For a customer, send their written insurance requirements, the project address and how they want the certificate holder listed.

A certificate only shows what your policy already covers. It doesn’t change the policy. Being listed as certificate holder is not the same as being an additional insured, so if a contract asks for additional insured status, a waiver of subrogation or primary wording, ask whether you need an endorsement. Put renewal dates on your calendar so required coverage never lapses.

How much does plumbing insurance cost in Delaware?

Your price depends on your services, location, staffing, claims history and the coverage you select. A quote gives you a price for your own business. Use the figures below to plan your budget.

Benchmark source, dates and budgeting details

How much does plumbing insurance cost in Delaware?

Insureon’s national plumbing medians (page updated August 5, 2026; checked October 11, 2026) provide a starting reference: general liability $147/month ($1,768/year), workers’ compensation $179/month ($2,150/year), commercial auto $285/month ($3,415/year), a business owner’s policy $213/month ($2,559/year), tools and equipment $42/month ($505/year), professional liability $67/month ($808/year), a commercial umbrella $93/month ($1,111/year), and surety bonds $8/month ($100/year). These are national medians for plumbing policies purchased through Insureon, mostly firms with fewer than five employees. They are not Delaware-specific rates and not a Simply Business price. The general-liability median is a $1 million per occurrence, $2 million aggregate policy with a $500 deductible.

• Compare quotes with the same work description, limits, deductibles and policy dates.
• Ask for the full yearly cost, plus any installment or endorsement fees.
• Price workers’ comp and auto separately from general liability.
• If a quote is a business owner’s policy, check what it bundles so you don’t count coverage twice.
• Ask whether a payroll or revenue audit could change the final bill.

A cheap policy that excludes work you do is the wrong policy. Have the agent explain the differences before you choose on price.

Review the annual total, deductible and limits together. Include any required endorsements so the quote prices the protection your work calls for. A business owner’s policy can combine liability and property coverage; those costs can overlap.

Delaware insurance requirements for plumbers

Use your licensing rules and written customer requirements to set the coverage you need. Give the agency those documents so it can check the quote against them.

What Delaware requires for plumbing businesses

We didn’t find a general liability or bond minimum in the Board’s master plumber requirements. Customers and general contractors may require certificates.

No general-liability dollar minimum is identified above for this master plumber credential. A bond, where required, is a separate obligation. Check local requirements and written customer contracts rather than assuming an unspecified statewide liability floor.

The occupational license is only one part of operating a plumbing business. Under Delaware’s Contractor Registration Act, section 3604, contractors must register with the Department of Labor before performing construction services or maintenance. Delaware One Stop explains the separate registration and workers’ compensation documentation. Confirm applicable coverage or exemption evidence for your workforce; do not assume a master plumber license completes business registration.

Workers’ comp

In Delaware, almost every employer with one or more employees must carry workers’ compensation, with only limited exceptions (Delaware Office of Workers’ Compensation).

Local rules

Cities and counties can add their own requirements. Before you register locally or pull a permit, ask the building department whether it wants a certificate of insurance, a bond or workers’ comp proof on file.

For work in unincorporated New Castle County, county contractor licensing is a separate requirement for plumbing and HVACR contractors. The 2026 permit-endorsed utility contractor checklist lists a $10,000 statutory compliance bond for the Master Plumber category and a current liability certificate with its specified bodily-injury/property-damage limits. Give that checklist to your agent and have the certificate name NCC Department of Land Use, License Processing. These are county requirements, not statewide professional-license minimums; the bond amount is not an insurance premium.

Official sources: master plumber licensure page · Delaware Office of Workers’ Compensation

For licensing, permits and the rest of setup, use our Delaware plumbing business guide.

Get your plumbing insurance quote

Simply Business is a business insurance agency. Start with your business details to see available coverage and prices for your work.

1. Describe your business. Enter your plumbing services, location, crew and payroll. Have your license information and customer-required coverage limits nearby.
2. Review the available coverage and price. Match the limits, covered activities and dates to your requirements. You choose whether to purchase.
3. Put your policy and proof of insurance in place. Once the policy is issued, request your certificate and check the start date before sending proof of coverage to a customer.

A certificate of insurance shows your existing coverage. It does not add coverage or make a customer an additional insured; that may require a policy endorsement.

Get your Delaware insurance quote ready

1. Your legal business name, address, Delaware master plumber license number, start date and experience.
2. The services you offer, your residential and commercial mix, typical job sizes and the area you cover.
3. Revenue, payroll, what each worker does, owners and subcontractors.
4. Vehicles, drivers, tools, equipment values and where they’re kept overnight.
5. Past claims, current policies and their end dates.
6. The certificate rules from each licensing office you deal with, and each customer’s written insurance requirements.

Before you take a job, ask the insurer to confirm in writing which work is covered, the exclusions, the limits and the start date. Asking for a quote doesn’t give you coverage. Simply Business offers insurance for plumbers, but whether a policy fits still depends on your business and the insurer.

Delaware plumbing insurance questions

Sources and further coverage guidance

Coverage and contract help

• How to read a service contract before you bid: a checklist for scope, payment terms, insurance and wage clauses.
• Insurance requirements for contracts: what limits, certificates and endorsements commercial and public buyers ask for.

Reviewed October 1, 2026 · Delaware plumbing contractors

Page presentation updated November 2, 2026. State requirements and cost benchmarks retain their separately stated source-review dates. Coverage is subject to eligibility, policy terms and state availability.