Avon, Connecticut Building Permit Guide

In Avon the Building Department enforces the state building and fire safety codes, reviews plans, issues permits and inspects construction. Applications go through the town’s OpenGov portal with full plans attached, and section 9-23 of the Avon Town Code sets the fee at $38 for the first $1,000 of work and $16 for each further $1,000 or part of it.

Avon is a town of about 19,100 people (Census estimate for 2025) in the Farmington Valley, and its Building Department covers the whole town from Avon Town Hall, 60 West Main Street, open 8:30 a.m. to 4:30 p.m. on weekdays. Christopher Szylobryt is the Building Official.

Farmington, Simsbury, Canton and West Hartford border Avon and permit through their own building officials.

What requires a building permit in Avon?

Avon’s permit types in OpenGov show the scope: residential and commercial building permits, and separate electrical, plumbing, mechanical, fire protection system and demolition permits. Every building application must carry architectural plans with elevations, floor plans, structural design and elevation grades, and the portal prints the state code’s list of work that needs no building permit.

What the town decides and what the state holds

The town’s own rules are the fee in section 9-23 of the Town Code, the minimum values used to price new homes, the zoning and wetlands regulations, and Engineering’s driveway, sewer and excavation permits. The code is the state’s: the 2022 Connecticut State Building Code applies to applications filed from October 1, 2022, and the 2026 edition, now delayed, will apply by filing date once it takes effect.

Connecticut has one State Building Code: the code itself sets which work needs a permit and which is exempt, every town’s building official is licensed by the State Building Inspector, and there is no county government. Connecticut rules

Avon building department: who handles permitting

The Building Department handles building, trade, fire protection and demolition permits, plan review together with the Fire Marshal’s office, inspections and certificates of occupancy. Planning and Community Development staffs the Planning and Zoning Commission, the Inland Wetlands Commission and the Zoning Board of Appeals. The Engineering, Sewer and GIS Department issues driveway, sewer and right-of-way excavation permits and inspects erosion controls, curb cuts and sewer connections. The Fire Marshal reviews plans for commercial buildings and homes with three or more units, and the Farmington Valley Health District approves septic systems and wells.

Permit types

Residential permits

The department’s permit information sheet says no one- or two-family building application is accepted without the completed application and fee; two complete plan sets covering the foundation, every floor, the roof, all elevations and sections; and two site plans with existing and proposed contours showing erosion control, the tracking pad, driveway, basement and garage floor and foundation elevations, footing drain and outlet, sewer lines and final grading. Two as-built surveys must be filed before framing starts. A septic lot needs the health district’s approval of the system design, with soil tests, at the time of application; a sewered lot needs the Town Engineer’s approval and proof that the connection charge is paid. A new house also needs a driveway permit, reviewed by the Town Engineer, with state Department of Transportation approval on a state road. Workers’ compensation proof or a sole proprietor or owner form, and energy code compliance (REScheck is accepted), complete the file.

Two smaller jobs have their own sheets. For a deck, zoning, engineering and the health district must approve the plan before the Building Department does; piers on an attached deck go at least 42 inches below final grade, framing is designed for a 40-pound live load, floors 30 inches or more above grade need a guard, stairs with four or more risers need a graspable handrail, and a hot tub or roof on the deck needs its own structural design. A finished basement plan is drawn to scale and shows room uses and sizes, ceiling heights, the emergency escape openings, smoke alarm locations, moisture control, fireblocking, insulation, and proof that the existing heating system can serve the new space.

Building or remodeling a home here? Alliance handles residential permit applications, so the crew isn't waiting on the counter.

Commercial permits

Commercial applications use their own permit type with the same plan standard: plans over 5,000 square feet must bear the seal of an architect registered in Connecticut and contain everything the state building and fire codes require, including electrical, plumbing, HVAC and sprinkler information. The building department and the Fire Marshal’s office review them together, and plans that fall short may be rejected as incomplete and must be resubmitted. Fire protection systems are filed as a separate permit.

For tenant improvements and new commercial builds, Alliance handles commercial building permits through issuance. More on this: commercial building permits explained.

What comes before the building permit

Planning and Community Development handles site plans, special permits and subdivisions, and every land use application carries the state’s $60 fee. Applicants whose project lies in a public water supply aquifer or watershed area must notify the state Department of Public Health and the water company by certified mail within 7 days of applying. Septic and well approvals come from the Farmington Valley Health District. Planning and Community Development also administers the town’s short-term rental rules, adopted by the Town Council on June 4, 2026.

Avon permit costs and fees

Section 9-23 of the Avon Town Code sets the fee for every permit: $38 for the first $1,000 of work or part of it and $16 for each additional $1,000 or part. For new one- and two-family homes the department prices the work at no less than its published minimum values per square foot, with the plumbing, mechanical and electrical permits figured the same way on their own minimums.

Worked example. A $20,000 remodel pays $38 for the first $1,000 plus 19 × $16 ($304), a total of $342. The town’s fee sheet and calculation form do not list the state education fee of 26 cents per $1,000 separately. Work done without a permit carries an extra charge: the Building Official’s guidance cites section 9-23(b) of the Town Code, which adds $1,000 or 100% of the permit fee, whichever is less, and waives it when the work was finished before the applicant acquired the property; the older permit information sheet describes the penalty as double the fee.

Trade permits and who may pull them

Electrical, plumbing and mechanical work each take a separate OpenGov permit with its own fee. The plumbing permit type warns that the only work exempt from it is stopping leaks and clearing stoppages without replacing pipes, valves or fixtures. The electrical type lists the code’s short set of exemptions, such as replacing lamps and fuses, and the mechanical type exempts portable appliances and minor part replacements.

The Department of Consumer Protection issues the state’s trade licenses and the home improvement and new home construction registrations, and its online search confirms them.

How to apply for an Avon building permit

OpenGov is Avon’s filing route. Section 29-263 of the General Statutes also lets applications be made in person, by mail or by email in a manner the building official prescribes, so call 860-409-4316 if the portal is not an option.

Review, corrections and what causes delay

State law gives the building official 30 days from the date of the application to approve or refuse a permit. Avon files are slowed by plans that are missing elevations, structural specifications or grades, by site plans without the contours and elevations Engineering and zoning need, by a missing health district design approval on a septic lot, and by unpaid sewer connection charges. Engineering does not review a sewer permit until its fee is paid.

Inspections in Avon

The department’s inspection sheet lists who inspects what. Before a permit is issued the Building Department may visit the site, and Engineering checks erosion control, the curb cut and the tracking pad before the footing inspection. The Building Department then inspects footings before concrete, foundation walls, waterproofing and footing drains before backfill, in-ground mechanicals before covering, each fireplace smoke chamber, rough framing and the trades before insulation, and insulation before drywall. A certified as-built plot plan must be in once the foundation is placed and before framing starts, so zoning can confirm the house sits where the site plan showed it.

Other offices inspect their own work: the health district inspects the septic system before it is covered and requires a bacteria and chemical test of every well before the certificate of occupancy, and Engineering inspects the sewer connection before the lateral is uncapped and the driveway before and after the work. Health, Engineering, zoning and wetlands must all approve their items before the certificate of occupancy is issued after the final inspection.

Avon permit search and official resources

The Building Department has posted monthly logs of the permits it issued (the latest online covers October 2025), and the Farmington Valley Health District has an online property document search for septic and well records (search by street name only, without the house number). For a building file, contact the department on 860-409-4316. Avon takes part in the National Flood Insurance Program; after the preliminary map appeal period of 2024, FEMA lists new flood maps for Avon taking effect on November 13, 2026, and the town’s Engineering page links a GIS viewer of flood zones.

• Avon Building Department
• Avon OpenGov permit portal
• Permit information, monthly permit logs and fee calculation form
• Code requirements for decks and finished basements
• Inspection information sheet
• Work without a permit guidance
• Avon Planning and Community Development
• Planning and zoning application forms and fees
• Avon FEMA flood mapping updates
• Avon Fire Marshal
• Septic information: Farmington Valley Health District
• Farmington Valley Health District property document search
• FEMA Community Status Book for Connecticut
• Office of the State Building Inspector
• Connecticut Department of Consumer Protection: licenses and registrations

Avon building permit FAQ

How much is a building permit in Avon?

$38 for the first $1,000 of work and $16 for each additional $1,000 or part, under section 9-23 of the Town Code; a $20,000 job pays $342.

How is a new house valued for the fee?

At no less than the department’s minimum values: $70 per sq ft for finished floors, $40 for finished attics and basements, $30 for garages and porches and $20 for decks, plus per-square-foot minimums for each trade.

Do plans need an architect?

Plans over 5,000 square feet must carry the seal of a Connecticut-registered architect; every application needs plans with elevations, floor plans, structural specifications and grades.

When is the as-built survey due?

Once the foundation is in and before framing starts; the department wants two copies filed.

Who approves septic systems in Avon?

The Farmington Valley Health District in Canton, which approves the design before the building application and inspects the system before it is covered.

Why was my inspection not made?

The department does not inspect unless the street number is posted and visible from the road.

Simplify Avon permitting with Alliance Permitting

Alliance Permitting is a permit documentation and submission company in Connecticut. We prepare your paperwork, file it correctly and coordinate with the permitting authority through issuance. We are not a contractor and we do not perform licensed plan review or inspections; that work stays with your licensed team and the jurisdiction.

This guide is provided by Alliance Permitting for general information about Avon permitting. Requirements, fees, and procedures change; confirm details with the permitting authority before relying on them.