Billerica, Massachusetts Building Department 2026: Permits, Inspections & Services

Building Department Contact & Office Hours

Office Hours

Times are local Eastern Time. Holiday hours and individual inspector availability may differ. Contact the department before visiting for a specific inspection-related question.

Building inspections are generally conducted between 10 AM and 3 PM on weekdays. The town requires at least 24 hours’ notice for inspections.

How to Apply for a Building Permit

Billerica provides an online permitting route through its official website. Before submitting an application, identify the work being performed and gather the supporting documents for that project.

1. Open the official application link. Visit Billerica Online Permitting. The town directs applicants to its external permit system.
2. Locate the correct application. Choose the applicable building permit process, such as residential construction, renovation, addition, or commercial work, using the options available in the portal.
3. Enter the property details. Supply the Billerica property address, applicant and owner information, contractor details where applicable, and a clear project description.
4. Prepare the supporting paperwork. Attach or submit required drawings, certified plot plans, affidavits, licenses, and other documents requested for the work.
5. Submit the application. Follow the portal’s submission and payment instructions. Save any application confirmation or reference number provided.
6. Respond to department requests. Monitor the application and supply missing plans, corrections, or other approvals when requested.
7. Wait for permit issuance. Do not begin work requiring a permit until authorization is issued. Arrange inspections at the required construction stages.

What Projects Require Permits?

The town generally requires building permits for construction, reconstruction, alteration, repair, removal, or demolition of regulated structures. The actual permit scope depends on the project and applicable exemptions.

Small project? Do not assume a shed, deck, pool, or minor renovation is automatically permit-exempt because of its size. Confirm the applicable local and state requirements before construction.

Required Permit Forms & Plans

The town publishes a project-specific residential checklist. The following are particularly important requirements that applicants often overlook.

Residential Additions & New Construction

• Completed residential building permit application.
• Certified plot plan identifying the proposed work; a mortgage inspection plan is not accepted as a substitute.
• Construction supervisor and home improvement contractor credentials, as applicable, or qualifying homeowner exemption paperwork.
• Workers’ compensation affidavit.
• Three sets of construction plans, including applicable engineering calculations and fire department review indicated by the town’s checklist.
• Signed contract or homeowner signature as required.
• Applicable energy compliance documents, including HERS calculations where required.
• Separate electrical, plumbing, and gas permits when the project involves those trades.

Decks & Sheds

• Completed building permit application.
• Certified plot plan showing where the deck or shed will be located.
• Two sets of building plans, as listed in the town’s residential checklist.
• Applicable contractor credentials or homeowner affidavit.
• Workers’ compensation affidavit and required contract or owner signature.

Kitchen, Bathroom & Basement Renovations

Prepare the application, contractor or homeowner documents, workers’ compensation affidavit, and a floor plan showing the proposed layout. If structural framing is affected, provide structural drawings and required engineering calculations.

Official Forms and Checklists

How to Schedule Building Inspections

Inspections confirm that permitted work meets applicable requirements at the relevant construction stages. Billerica’s Building Department identifies 978-215-1925 as its direct inspection voicemail line.

1. Identify the inspection. Confirm whether you need foundation, framing, insulation, electrical, plumbing, gas, or final inspection.
2. Have the permit information ready. Keep the property address, permit number, contractor or applicant name, phone number, and requested inspection type available.
3. Call the appropriate inspector. For building inspections, call 978-215-1925 and leave a clear voicemail. Use 978-671-1307 for electrical or 978-671-1339 for plumbing and gas.
4. Provide advance notice. Request the inspection at least 24 hours ahead. This is a minimum notice requirement, not a guarantee of a specific appointment time.
5. Prepare the work area. Make the required work accessible and avoid concealing construction that must first be inspected.
6. Resolve any failed items. Follow the inspector’s correction instructions and arrange a reinspection when necessary.

Published windows are Monday through Friday, subject to availability, holidays, and department scheduling. All inspection types require at least 24 hours’ notice.

Billerica Building Permit Fees

Billerica’s newer published fee schedule uses valuation-based charges for many construction projects, with minimums and specific flat-fee exceptions.

Valuation details: The fee schedule references construction-cost benchmarks of $250 per square foot for residential work and $350 per square foot for commercial work. The Building Inspector determines the applicable estimated construction value, excluding land value; the benchmarks may be adjusted annually.

Application processing: Building permits generally carry a $30 administrative processing payment at application, credited toward the total fee. The schedule exempts the listed qualifying accessory residential structures from that processing charge.

Separate electrical, plumbing, gas, sheet-metal, or other charges may apply. Fees are subject to changes and special conditions. Check the current town-published schedules before paying.

Building Codes, Zoning & Local Requirements

Massachusetts Building Code

In 2026, the applicable statewide building code is the 10th Edition of 780 CMR. It is based on modified 2021 International Codes, with Massachusetts-specific amendments. The transition period from the previous edition ended June 30, 2025.

Residential and commercial projects are subject to different code provisions. Electrical, plumbing, gas, fire safety, accessibility, and energy requirements may impose additional obligations.

Review the Massachusetts 10th Edition Building Code and the state energy-code guidance. Confirm the applicable local energy-code level before preparing compliance documents.

Setbacks, Plot Plans & Zoning

The Building Department also administers and enforces applicable Billerica zoning requirements. Before placing a new structure, confirm the property’s zoning district, required setbacks, lot coverage, easements, and any wetland-related restrictions.

The town’s published shed FAQ identifies the following general setbacks:

• Sheds of 100 sq. ft. or less: 7 feet 6 inches from the side property line and 10 feet from the rear property line.
• Sheds exceeding 100 sq. ft.: 15 feet from the side property line and 20 feet from the rear property line.

These figures come from the town’s published guidance and should not be treated as approval for every lot. Confirm current zoning provisions, setbacks, district exceptions, and any subsequent amendments with the Building Department before construction.

For structures or added living space, the town’s FAQ states that a certified plot plan is required. A previous survey may be available through closing documents, your lender, earlier town records, or a professional land surveyor.

Accessory Dwelling Units (ADUs)

Billerica publishes a local ADU guide explaining Massachusetts protected accessory dwelling unit rules. A qualifying ADU generally cannot exceed 900 square feet or half the principal dwelling’s gross floor area, whichever is smaller.

Attached or detached ADUs may be possible, but building, zoning, fire, environmental, utility, and other requirements still apply. A protected ADU does not generally require owner occupancy, although short-term rental uses are not protected in the same way.

For a proposed ADU, confirm building permit requirements, dimensional compliance, separate egress, fire separation, smoke alarms, water and sewer capacity, and any conservation review.

Read Billerica’s official ADU guide (PDF).

Permit Status, Existing Records & Final Approval

If you have already applied, keep your permit number and application confirmation available. The town publishes an official permit-report link that can assist with researching permit information.

1. Open the Billerica Permit Report link.
2. Follow the available search options to look for relevant permits or property records.
3. Compare any displayed permit information with your application documents.
4. If a record is missing, incomplete, or unclear, contact the Building Department with the property address and available permit details.

Before occupying or using newly completed work where an occupancy or final approval is required, ensure all applicable inspections and departmental sign-offs are complete. Commercial projects may require additional approvals from zoning, fire prevention, public works, or other town authorities.

Common Application Problems & What to Do

Public Works note: Some projects also require separate water, sewer, driveway, stormwater, or trench-related approvals. These are not automatically covered by a building permit. Contact the appropriate town division when work affects those systems.

For another Massachusetts project, consult our Beverly building permit guide or Attleboro building permit guide for that municipality’s application and inspection process.

Frequently Asked Questions

Official Billerica Resources

Information reviewed: October 9, 2026. Permit requirements, charges, inspector assignments, and office schedules can change. USBuilding.org is an independent informational resource and is not affiliated with the Town of Billerica or any government agency.