Worcester

1. Request New Address from Worcester DPW (mandatory pre-permit step) (~7d)
   Before any building permit can be filed, Worcester requires a separate address (or unit designation) be assigned to the ADU. Submit Street Numbering Request through the OpenGov portal at worcesterma.portal.opengov.com. DPW Engineering (dpwpermits@worcesterma.gov) typically issues new ADU sub-addresses (e.g., 123R Main Street or 123 Unit B Main Street) within 5 business days. This is unique to Worcester among MA cities at this scale.
2. Worcester Zoning Ordinance dimensional check (Article IV ADU provisions) (~3d)
   Worcester ADU Ordinance (ordained Jan 13, 2026) requires: max 900 sqft gross, side or rear yard only (NOT front yard), comply with the underlying zoning district's setback and height. Worcester has 7 residential districts (RS-7, RS-10, RG-5, RL-7, etc.); RS-7 typical setbacks are 20 ft front / 8 ft side / 25 ft rear. Existing parking cannot be removed but no new ADU parking required. By-right where compliant.
3. Worcester Planning Board Special Permit (only if exceeding dimensional standards) (~90d)
   If proposed ADU exceeds 900 sqft, exceeds setbacks, or sits in front yard, Special Permit required per Worcester Zoning Ordinance Section 9. Planning Board hearings on 1st and 3rd Mondays; 14-day abutter notice; ~3-month total time. Application submitted via OpenGov portal with site plan stamped by MA-licensed surveyor and plan-set stamped by MA-licensed RA. Special Permits are discretionary - no guarantee of approval.
4. Wetlands / Floodplain / Historic District municipal screening (~35d)
   Worcester has 11 historic districts (including Crown Hill, Massachusetts Avenue, and Elm Park) under Worcester Historical Commission. Lake Quinsigamond shoreline (eastern Worcester, Lincoln & Plantation Streets) and Coes Reservoir / Salisbury Pond add Conservation Commission Notice of Intent under MGL Ch. 131 s.40. FEMA flood zones along Mill Brook and Tatnuck Brook tributaries.
5. Submit Building Permit via OpenGov portal (worcesterma.portal.opengov.com) (~28d)
   Required exhibits: to-scale architectural plans (Worcester Inspectional Services explicitly requires this), surveyor-stamped plot plan showing setbacks, notarized owner's affidavit, contractor MA Construction Supervisor License, DIA Form 153 (Workers' Comp affidavit), and the new ADU address letter from DPW (Step 1). Long-form review since ADU is new dwelling unit. Email inspections@worcesterma.gov for status.
6. DPW utility coordination (Worcester DPW & Parks) (~21d)
   Worcester operates municipal water (Quinapoxet/Wachusett Reservoir source via MWRA backup) and combined-sewer system in older neighborhoods. ADU water/sewer connection requires DPW Engineering review. Stormwater runoff from new impervious surfaces in CSO areas must use BMPs (rain garden, cistern, dry well). National Grid (electric) and Eversource (gas) connections coordinated separately.
7. Inspectional Services Department plan review and permit issuance (~30d)
   Worcester ISD assigns a plans examiner. The Department issued 51% more permits in 2024 than 2023 (per Worcester Open Data 2024), so backlog runs higher than smaller MA cities. Average plan-check cycle is 2 rounds. ISD office at City Hall Room 401, 455 Main Street; permit issuance typically same-day after plans approved.
8. Construction inspections via OpenGov portal scheduling (~70d)
   Inspections requested through worcesterma.portal.opengov.com: footing, foundation, frame, rough electrical (Worcester Wiring Inspector), rough plumbing/gas (Plumbing & Gas Inspector), insulation, fire-stopping, smoke/CO devices, final building. Smoke/CO certificate signed by Worcester Fire Department before final.
9. Certificate of Occupancy and Worcester Assessing Department recordation (~14d)
   Final CO issued through OpenGov; copy to Worcester Assessing Department to add the ADU to property card. Property tax recalculated mid-cycle if CO issued before fiscal year end (June 30). For rental ADUs, register with Worcester Inspectional Services Rental Inspection Program.

• Long-term rental: yes Long-term rental of ADU explicitly permitted; Massachusetts owner-occupancy preemption (where applicable) makes ADU eligible for full landlord-tenant treatment.
• Short-term rental: with-restrictions STR rules vary by city. Worcester regulates STRs separately from ADU permitting; check local STR ordinance and HOA covenants.
• Office rental: with-restrictions Detached office rental requires home occupation permit or rezoning.
• Home office: yes Home occupation permitted with restrictions on signage and customer traffic.
• Studio / workshop: yes Personal artist studio is a permitted accessory use.
• Agriculture: with-restrictions Limited urban agriculture permitted in residential zones; livestock varies by district.
• Relative support: yes Family-occupancy ADU explicitly permitted in single-family zones.

Staff: Worcester Planning & Regulatory Services (ADU Quick Guide author; Planning Board liaison; Special Permit intake (Article IV ADU provisions)) planning@worcesterma.gov, Worcester Inspectional Services Department (Building permits via OpenGov portal; long-form review for ADU as new dwelling unit; CO issuance) inspections@worcesterma.gov, Worcester Department of Public Works - Engineering (Street Numbering Requests (mandatory pre-ADU permit step), water/sewer connection review) dpwpermits@worcesterma.gov, Worcester Conservation Commission (MA WPA Notice of Intent reviews (Lake Quinsigamond, Salisbury Pond, Mill Brook, Tatnuck Brook tributaries)) conservation@worcesterma.gov, Worcester Historical Commission (Certificate of Appropriateness for ADUs in Crown Hill, Massachusetts Avenue, Elm Park, and 8 other historic districts) historicalcommission@worcesterma.gov, Worcester Fire Department - Fire Prevention (Smoke/CO certificate; fire-rated separation review for attached ADUs), Worcester Assessing Department (Property card update post-CO (ADU added as new dwelling unit; affects property tax)) assessing@worcesterma.gov

• Water: Worcester Water Utility · 21d connect · $4,500
• Sewer: Worcester Sewer / Wastewater · 21d connect · $5,500
• Electric: Worcester Electric Utility · 14d connect · $1,800
• Gas: Worcester Gas Utility · 21d connect · $1,500

Realistic total: best 7mo · typical 11mo · worst 17mo

Modular pathway inspectors are experienced with modular

State ADU loans:

• MassHousing Accessory Dwelling Unit Loan Program (ADULP)
• Massachusetts Housing Partnership ADU Incentive Program
• Massachusetts Housing Partnership ADU Technical Assistance Program

Massachusetts has no HOA-ADU preemption; HOA covenants restricting ADUs are enforceable.