Delaware Building Department 2026: Permits, Inspections & Services

How Building Permits and Inspections Work in Delaware in 2026

If you searched for the Delaware Building Department, the first thing to determine is not which form to download—it is which government office has jurisdiction over your address.

This matters because a house in unincorporated New Castle County can use a different permit system from a property inside Wilmington or Newark. Kent County also has towns that issue their own permits, while Sussex County requires a county building permit for construction even when a property is located inside a municipality.

This guide brings those pieces together so you can identify the right office, understand what to prepare, apply for a permit, schedule inspections, and deal with common Delaware state approvals without bouncing between multiple websites just to understand the process.

Start Here: Which Delaware Building Department Do You Need?

A mailing address alone can be misleading. A property can use the name of a nearby city while actually being outside city limits. Permit jurisdiction should be confirmed from the parcel or local government—not just the ZIP code.

What Work Usually Needs a Building Permit?

Permit requirements are local, so there is no single Delaware list that safely answers every project. However, regulated construction commonly includes the following:

• New homes and commercial buildings
• Room additions and structural alterations
• Garages and larger accessory structures
• Decks, porches and structural patios
• Finished basements and major interior renovations
• Swimming pools and spas
• Demolition
• Changes in use or occupancy
• Structural roof work
• Mechanical, plumbing or electrical work when regulated
• Solar installations
• Manufactured-home placement
• Commercial tenant improvements

Do not assume a small project is automatically exempt. Sheds, fences, reroofing, replacement windows, driveways and similar work are treated differently by different Delaware jurisdictions.

How to Apply for a Delaware Building Permit

1. Confirm the permitting jurisdiction.
   Determine whether the property is controlled by New Castle County, Kent County, Sussex County, Wilmington, Dover, Newark, another city, or another town.
2. Check zoning before finalizing your plans.
   Confirm setbacks, lot coverage, permitted use, building height and accessory-structure rules. A project can meet structural code requirements but still fail zoning review.
3. Prepare the basic project information.
   Have the property address, parcel information, owner’s name, contractor information, estimated construction value and a clear description of the work ready.
4. Prepare plans and supporting documents.
   Depending on the project, this may include a site or plot plan, floor plans, elevations, structural details, foundation information, energy documentation, engineering calculations, contractor credentials or outside-agency approvals.
5. Submit through the correct official system.
   New Castle County uses eServices/ePlans. Kent County uses MyGovernmentOnline. Sussex County publishes its own permit procedures. Cities such as Wilmington, Dover and Newark maintain separate processes.
6. Respond to review comments.
   If reviewers request revised drawings or missing information, submit a complete response. A permit is not issued merely because the application was received.
7. Pay the assessed fees and wait for issuance.
   Do not begin regulated construction simply because plans were uploaded or fees were estimated. Confirm that the actual permit has been issued.
8. Follow the inspection sequence.
   Keep required work visible until the applicable inspection is completed. Continue through rough, framing, energy and final inspections as required by the permit.

New Castle County Building Permits

For property under New Castle County jurisdiction, construction permitting is handled through the Department of Land Use.

The county uses its eServices/ePlans system for building, demolition and many utility permits.

New Castle County online application steps

1. Open the official New Castle County Get a Permit page.
2. Select the ePlans/eServices login and create an account if this is your first application.
3. Submit the permit application through eApply.
4. Watch for the email inviting you into the ePlans project.
5. Upload the required drawings and supporting documents.
6. The county performs an initial prescreen for completeness.
7. If complete, the application moves to the applicable review disciplines.
8. Respond to changemarks or review comments when corrections are required.
9. Complete outstanding review items and pay required fees.
10. After issuance, download the permit and approved plans.

Permit status: New Castle County’s online system can search available records using a permit number and also supports searches using project, contractor, parcel or address information.

Inspections: the county’s inspection system allows permit holders to schedule, cancel or reschedule inspections and view results. On the scheduled day, the county states that an email is sent at 7:00 a.m. with the assigned inspector and estimated timing.

Department contact: New Castle County Department of Land Use, 87 Reads Way, New Castle, DE 19720. Planning and Permits: 302-395-5400. Building inspection questions: 302-395-5572. General department hours are Monday through Friday, 8:00 a.m. to 4:00 p.m.

Kent County Building Permits

Kent County’s Inspections & Enforcement services use MyGovernmentOnline (MGO) for building permit applications.

How to apply in Kent County

1. Open the Kent County Permits, Building & Sewer page.
2. Select the building permit application link.
3. Create or sign in to your MyGovernmentOnline account.
4. Select the permit type that matches the work.
5. Enter the property and project information.
6. Upload the required plans, plot information and supporting documents.
7. Submit the application and monitor the account for review comments.
8. Complete payment and obtain the issued permit before beginning regulated work.

If the property is inside a Kent County town, do not assume the county is always the permit issuer. Kent County publishes a municipal permitting list showing which towns issue their own permits and which require local zoning approval before a county permit can be issued.

For example, Kent County’s published information identifies Dover, Camden, Cheswold, Clayton, Frederica, Harrington, Milford, Smyrna and Wyoming among municipalities where county building permits are not used in the ordinary municipal process. Always check the current list before filing.

Kent County building permit assistance: 302-744-2451. The county administrative complex is at 555 Bay Road, Dover, DE 19901.

Sussex County Building Permits

Sussex County has an important rule that can surprise property owners: its official permit page states that all construction in Sussex County—new work, remodeling and additions—requires a Sussex County-issued building permit, whether the property is in an unincorporated area or inside a municipality.

A municipality may still have its own zoning, planning or local permit requirements, so being inside a town can mean you need both local approval and the county process.

Sussex County permit office

The county states that most applications are made through the Building Permit Office, although some permit situations may allow another submission method. Confirm the current process for your exact project before traveling to Georgetown.

Sediment and stormwater requirement

Sussex County states that projects disturbing 5,000 square feet or more require a Sediment and Erosion Control Plan under Delaware sediment and stormwater requirements. This includes applicable single-family home construction.

If your project reaches that threshold, deal with the conservation requirement early. Waiting until the building permit review is underway can create an avoidable delay.

Wilmington, Dover and Newark Have Their Own Processes

Wilmington

The City of Wilmington’s Department of Land Use & Planning handles city building permits, plan review and inspections.

The city publishes estimated internal review periods based on project size: approximately one week for smaller projects under $100,000, two weeks for projects from $100,000 through $999,999, and four weeks for projects over $1 million. These are Land Use & Planning review estimates, not guaranteed total approval times. Fire Marshal, Public Works, board, historic or other reviews can add time.

Office: 800 N. French Street, 3rd Floor, Wilmington, DE 19801. Permit questions: 302-576-3050. Published office hours are Monday through Friday, 8:30 a.m. to 4:30 p.m.

Dover

Dover is one of the Kent County municipalities that handles its own city building permits. City services include building permits, inspections, occupancy matters and related licensing.

For current applications and requirements, use the City of Dover Planning and Inspections forms page. Building permit and inspection assistance is available through the city’s permitting staff at 302-736-7011.

Newark

Inside Newark city jurisdiction, the City of Newark handles building permits and local inspections rather than treating an ordinary city project as a New Castle County permit application.

The city’s Building Permits page covers residential improvements, business renovations and other regulated projects. Code Enforcement can be reached through the city at 302-366-7000.

What Documents Should You Prepare?

Exact submittal requirements depend on the project, but preparing the following items before starting an online application usually saves time:

• Property address
• Parcel or tax identification number
• Owner name and contact information
• Applicant and contractor information
• Clear written scope of work
• Estimated project valuation
• Site or plot plan
• Floor plan
• Building elevations when applicable
• Foundation and structural details
• Mechanical, electrical and plumbing information when applicable
• Energy-code documentation
• Floodplain information if applicable
• Septic or well approval where applicable
• Fire Marshal documentation for projects requiring fire review
• Municipal zoning approval when required before county submission

Commercial buildings, major additions, structural modifications and specialized occupancies can require architectural or engineering documents beyond this basic list.

Building Inspections in Delaware

Receiving a permit is not the end of the process. The permit normally establishes a sequence of inspections that must occur while construction is still visible.

This is a planning guide, not a universal Delaware inspection schedule. Your permit, approved plans and issuing department determine the actual inspection sequence.

Delaware Plumbing Permits Are a Separate Issue

The Delaware Division of Public Health operates the state’s Plumbing Permit and Inspection Program in locations covered by the state program. Local jurisdictions with their own plumbing programs may handle the process differently.

The state program uses the 2021 International Plumbing Code with Delaware amendments.

Important current details published by the Division of Public Health include:

• Permits can be issued to Delaware-licensed plumbers and qualifying owner-occupants.
• The home must be owner occupied and not for sale or lease for the homeowner pathway.
• Permit applications must use the current form and be complete.
• The program states that processing can take up to 48 hours.
• The state plumbing permit fee is $100.
• A plumbing inspection cannot be requested during the first 24 hours after permit issuance.
• The permit includes three inspections.
• Additional inspections are charged at $50 each by the state program.
• The program states that it has three working days to respond to an inspection request.

Kent County plumbing inspection requests can be sent to DHSS_DPH_KentCoPlumbing@delaware.gov. Sussex County requests can be sent to DHSS_DPH_SussexCoPlumbing@delaware.gov.

Electrical Permits and Inspections

Electrical regulation is another area where the building permit alone may not be enough. Delaware’s Board of Electrical Examiners regulates electrical professionals and licensed inspection agencies.

A qualifying homeowner who intends to perform their own electrical work may need a Delaware homeowner electrical permit.

For the homeowner pathway, the state requires the proposed electrical plan to be reviewed and approved by a Delaware-licensed electrical inspection agency before the homeowner permit application is submitted.

The state also places important limits on homeowner permits. For example, the work must be performed by the owner-occupant, the property cannot be for sale or rent, and homeowner permits are not issued for certain multi-unit or commercial situations. Homeowners also cannot use this pathway to install their own internal wiring or electrical equipment associated with swimming pools or hot tubs.

State Fire Marshal Review

Some construction projects require fire-safety plan review in addition to the ordinary building permit. The Delaware Office of the State Fire Marshal reviews plans and specifications for applicable new construction, additions and modifications.

Fire review can involve building plans, site plans, fire alarms, sprinkler systems, kitchen hood suppression systems, tanks, day-care facilities, assembly occupancies and other regulated work.

There is an important local exception: projects within Wilmington, the City of New Castle, Newark and Dover can fall under jurisdictional city fire marshals for applicable fire-permit and occupancy matters.

Delaware Energy Code Changes in 2026

Energy-code requirements deserve special attention on 2026 projects because Delaware updated its statewide energy conservation regulations.

In April 2026, the Delaware State Energy Office promulgated revisions adopting the 2024 International Energy Conservation Code framework and ASHRAE 90.1-2022 for applicable commercial and high-rise residential construction, with Delaware amendments.

Implementation can depend on the project type, permit date and local enforcement transition. Before preparing energy calculations, confirm which edition your permitting jurisdiction expects for the application you are filing.

Building Code Editions Are Not Identical Everywhere

Delaware has statewide requirements in certain areas, but local structural building-code adoption is not identical across every jurisdiction.

Do not select a model-code edition simply because it is the newest book available. Use the edition and amendments adopted for the jurisdiction and permit date.

Septic Systems, Wells and Other Approvals

A building permit does not automatically approve every system on the property.

Septic systems

For property using an on-site wastewater system, the Delaware Department of Natural Resources and Environmental Control (DNREC) administers the septic approval process.

The state describes a three-part path:

1. A licensed Class D soil scientist performs the site evaluation.
2. A properly licensed designer prepares the system design and obtains the septic permit.
3. A licensed Class E system contractor installs the approved system.

Check Delaware septic-system requirements and permit resources ↗

Private wells

DNREC also issues well construction and use permits. Delaware requires wells to be constructed by a licensed water-well contractor, and the contractor normally prepares the permit application with the property owner’s authorization.

Check Delaware well permit requirements ↗

Manufactured homes

Manufactured-home installation has additional state requirements. Delaware law requires manufactured homes to be installed by a properly licensed installer, and installations are subject to required inspections before occupancy.

Delaware Board of Manufactured Home Installation ↗

How Much Does a Delaware Building Permit Cost?

There is no single statewide Delaware building-permit price. Building fees are established by the county or municipality handling the application and can depend on:

• Project valuation
• Square footage
• Residential or commercial use
• New construction versus alteration
• Plan review
• Separate trade permits
• Zoning or land-use applications
• Certificate of occupancy fees
• Reinspection fees
• Utility, conservation or outside-agency approvals

For that reason, do not budget a project using a fee from another Delaware county or city. Wait until the responsible jurisdiction calculates or confirms the actual fee.

How Long Does Permit Approval Take?

There is also no statewide approval time. A straightforward residential permit can move much faster than a commercial development, major structural alteration, floodplain project or application requiring several outside agencies.

The biggest causes of preventable delay are usually:

• Applying to the wrong jurisdiction
• Missing site or plot information
• Incomplete construction drawings
• Unresolved zoning problems
• Missing contractor information
• Not responding to every review comment
• Waiting too long to obtain fire, septic, stormwater or other approvals
• Submitting documents that do not match each other

How to Check a Delaware Building Permit or Inspection Status

Use the system belonging to the jurisdiction that issued the permit.

When checking a record, do not confuse submitted, approved, issued and finaled. An approved plan review does not necessarily mean the construction permit has been issued, and an issued permit does not mean the final inspection has passed.

Before You Schedule an Inspection

• Confirm the permit is active.
• Request the correct inspection type.
• Have the permit or application number ready.
• Keep approved plans available at the job site when required.
• Make sure the inspector can safely access the work.
• Do not cover work that needs inspection.
• Complete required electrical, plumbing or other prerequisite inspections first.
• Check whether outside reports must be submitted before the inspection.
• After inspection, read the actual result and correction notes.
• Do not treat the project as complete until the required final approval has been obtained.

Common Problems and the Practical Next Step

Delaware Building Department FAQs

One Final Check Before You Build

Delaware’s permit system becomes much easier once you separate the process into three questions:

1. Who has jurisdiction over the property?
2. Which local and state approvals does this specific project need?
3. Which inspections must pass before the work can be covered or occupied?

Get those three answers before construction begins. It can save you from submitting to the wrong agency, opening walls twice, delaying a closing, or trying to resolve an unpermitted project after the work is finished.

For live applications, payments, inspection appointments and final legal determinations, use the responsible government office linked throughout this guide.

If your property is outside Delaware

Permitting rules change immediately across state and county lines. For nearby regional research, see our Baltimore County building permit guide and Anne Arundel County permit guide. New Jersey projects use a different statewide construction-code system; our Brick, New Jersey building department guide shows how that process differs.

USBuilding.org is an independent informational resource and is not a Delaware government agency. Permit requirements, fees, staff contacts, portals and adopted codes can change. Our research approach prioritizes official government sources; see the USBuilding.org Editorial Policy for source and review standards. Information reviewed for this guide: October 2026.