Most of what changes for a tradesperson in Delaware is set by the state, not Washington: how you get paid, whether you need to register, and what you owe in tax. Here is what actually differs, and where to run your own numbers.
Each section below points to a tool that runs your exact numbers for Delaware.
Tax in Delaware
Delaware has a graduated state income tax that runs up to 6.6% at the top, on top of your federal taxes. Graduated means the rate climbs as your profit does, so a good year costs proportionally more. You owe federal income tax and self-employment tax as well, and you make estimated payments to both Delaware and the IRS through the year.
Delaware has no statewide sales tax, so you do not add sales tax to your work. Some local areas can still levy their own, so check locally if you work in a taxing town.
Work out what to hold back on the Tax Set-Aside Calculator, which runs the federal and self-employment numbers for Delaware.
Getting paid: liens and retainage
A mechanic's lien is the tool that actually gets a Delaware contractor paid, and in Delaware you generally have to record it within 120 days of your own completion of labor or your last delivery of materials - not the whole job finishing. Miss it and you lose the lien, so the dates matter.
Enforcing it has its own clock. There is no second countdown. Filing the statement of claim IS commencing the action - it serves as the complaint (2712(a)) - and neither Chapter 27 nor the Superior Court rules set any deadline to issue or prosecute the writ of scire facias afterwards. Two things still bite. Within 10 DAYS of filing you must send notice by certified mail to everyone holding a lien on the property (Super. Ct. Civ. R. 4(f)(4)). And a case left dormant SIX MONTHS gets a notice from the Prothonotary giving you 30 days to do something, after which it is dismissed for want of prosecution as of course (Super. Ct. Civ. R. 41(e)). Delaware is unforgiving at the filing stage and forgiving afterwards - provided you keep the case moving. Work out your dates on the Lien Deadline tool, and if they are close, get an attorney to confirm them against the statute (25 Del. C. 2711, 2712, 2714; Del. Super. Ct. Civ. R. 3, 4(f)(4), 41(e)).
On money held back as retainage, here is where Delaware lands:
NOT VERIFIED AS A WHOLE ROW. 29 Del. C. §6962 was read and the public 5% and its 2% step-down carry their own citations. The private prompt-pay timing was not read at all. The whole-row stamp is withheld until both sides have been read.
- Private work: No statutory cap on private work in Delaware. Whatever your contract says governs, so read the withholding clause.
- Public work: 5% of the payments to be made to the contractor for work performed.
- Release: Set by each agency's own published retainage procedures, which every agency must have in place before it lets a contract that holds retainage.
- Prompt pay: The period for a prime to pay a subcontractor on private work is not verified.
And the step-down is not the same thing as a right. Delaware cuts the rate to 2% when the project reaches 50% completion and an interim evaluation of the project has been carried out. That drop is not automatic: you have to apply for it in writing, and it can carry further conditions. The statute does not address putting the rate back up.
Heads up: The private prompt-pay timing is not verified; confirm it. Only the public-works section was read.
Check the Retainage Calculator before you sign a contract that holds back more.
There is no Delaware retainage letter on this site, and the NOT VERIFIED line above is why. A letter that tells the party holding your money what to hand over only gets written over a row that has been read against the statute in full. The Document Hub carries the forms that do not turn on a state rule.
Do you need a license in Delaware?
Delaware does not make you sit a full contractor license, but it does require you to register with the state before you work. Registration is lighter than a licensing exam, but skipping it can cost you: in a lot of states an unregistered contractor cannot even sue to get paid. The requirement: Two statewide obligations, both from the first dollar: a Division of Revenue business license, and Department of Labor contractor registration. It is handled by Division of Revenue (business license) + Office of Contractor Registration, Delaware Department of Labor.
Trade licenses for electrical, plumbing and HVAC are usually separate and often required even where a GC license is not. See what applies to your trade on the Contractor License Checker.
Building codes and permits
Delaware has no single statewide building code, so the edition you build to and whether you need a permit depend on your city or county. Do not assume the town next door adopted the same code or the same amendments.
- Homes: none statewide; adopted county by county, currently 2018 in Kent, 2021 in Sussex and 2024 in New Castle since 1 January 2026
- Electrical: 2023 (effective 1 January 2026)
- Energy: 2018 for dwellings of one and two stories / 2018 IECC with ASHRAE 90.1-2016 for commercial and high-rise residential; a 2024 IECC and ASHRAE 90.1-2022 update took legal effect 11 April 2026 and is phasing in through 2027
- Plumbing: 2021 IPC (published as the 2021 State of Delaware Plumbing Code), mandatory statewide
Delaware does not run one edition across the whole job, and the energy code is where it splits: 2018 for dwellings of one and two stories / 2018 IECC with ASHRAE 90.1-2016 for commercial and high-rise residential; a 2024 IECC and ASHRAE 90.1-2022 update took legal effect 11 April 2026 and is phasing in through 2027. That matters more than the number itself. If you work on houses, the residential edition is your book, and the single figure quoted in most adoption charts is the commercial one.
Delaware has no state building-code authority at all: the structural code is a county matter and the three counties are on three different editions. Everything else IS statewide. Electrical is set by the State Fire Prevention Commission, plumbing by the Division of Public Health and binds every political subdivision, and energy by DNREC. The energy code is split by statute rather than by rule, with one- and two-story homes on the IECC and commercial and high-rise residential on the IECC plus ASHRAE 90.1. One thing to watch: 16 Del. C. §7602(c) requires new homes to be zero-net-energy capable, and DNREC formally declined to implement that in March 2026, leaving the statute and the enforced rule out of step until the legislature resolves it.
Source: ICC state page and county ordinances (Kent County Levy Court, Sussex County Council, New Castle County) for the building code; Delaware State Fire Prevention Commission, 1 Del. Admin. Code 701 ch. 7 (electrical); DNREC Division of Climate, Coastal and Energy, 7 Del. Admin. Code 2101 under 16 Del. C. §7602 (energy); Division of Public Health, 16 Del. Admin. Code 4455 (plumbing). We have not yet read this row against Delaware's own adopting authority, so confirm the edition locally before you rely on it.
Check a specific job on the permit tool.
Pay and workers' comp
The minimum wage in Delaware is $15.00 an hour. That is the floor for anyone you put on the books, and it is worth confirming against the state labor department each year because several states step their rate mid-year. Check a rate on the minimum-wage tool.
Workers' comp rates in Delaware are not published as a single figure; they turn on your trade's class code and your payroll. Get a realistic range on the Workers' Comp Estimator, then get a real quote.
If a client will not pay
If a client will not pay, you can sue for up to $25,000 in Delaware's Justice of the Peace Court. That covers most unpaid-invoice disputes for a small outfit; a bigger claim goes to regular civil court where you will probably want an attorney. Walk through whether filing is worth it on the Small Claims checker.
The clock runs the other way too: a client generally has 3 years to sue you over the work under a written contract in Delaware, and there is no absolute cutoff, so your exposure turns on when a defect is found. Work out your exposure on the Warranty & Claim Deadline tool.
Common questions
How much state income tax will I pay in Delaware?
Delaware has a graduated rate up to 6.6% state income tax on your profit, on top of federal income tax and self-employment tax. Use the Tax Set-Aside Calculator to see what to hold back.
Do I need a contractor's license in Delaware?
Delaware does not require a full license but does require you to register with the state first. The requirement: Two statewide obligations, both from the first dollar: a Division of Revenue business license, and Department of Labor contractor registration. Working unregistered can stop you suing to get paid.
What is the small claims limit in Delaware?
You can sue for up to $25,000 in Delaware's Justice of the Peace Court. The filing fee is typically $35 to $120. Larger claims go to regular civil court.
How long do I have to file a mechanic's lien in Delaware?
Generally 120 days from your own completion of labor or your last delivery of materials - not the whole job finishing. Miss it and you lose the lien. Work your own dates out on the Lien Deadline tool.
What is the minimum wage in Delaware?
$15.00 an hour in Delaware, above the federal $7.25. Several states step their rate mid-year, so confirm it before you set a payroll.
What building code does Delaware use?
There is no single statewide building code in Delaware: the edition, and whether you need a permit at all, are set by your city or county. Homes: none statewide; adopted county by county, currently 2018 in Kent, 2021 in Sussex and 2024 in New Castle since 1 January 2026. Do not assume the next town over adopted the same thing.
The honest bit
These are the 2026 rules for Delaware as they stood when this guide was written, and they change: legislatures move thresholds, deadlines and rates every year. Treat this as general guidance to point you in the right direction, not legal, tax or financial advice. Verify anything you rely on at the source (the IRS, the Delaware tax and licensing agencies, and your local building department) or with a professional. Where Delaware does something unusual, the detail is called out above rather than glossed over.
Related: Tax Set-Aside Calculator · Mechanic's Lien Deadline · Contractor License Checker · Small Claims checker · Working in Your State
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