What happens if you skip the permit (and you needed one)
- Stop-work order and $500–$2,000 fine if code enforcement catches unpermitted cutting; city must re-inspect framing, risking forced removal of non-code header.
- Insurance claim denial—many homeowners insurance policies exclude damage from unpermitted structural work, leaving you uninsured for wind or water intrusion.
- Resale disclosure hit: unpermitted openings must be disclosed on the Property Disclosure Summary Form (FDSF), reducing buyer confidence and appraisal value by 5–15%.
- Lender refinance block—if you refinance or sell with an outstanding permit violation, the lender's title search flags the unpermitted opening, halting closing until permit is pulled retroactively (much costlier).
Dunedin new window/door opening permits—the key details
All new window and door openings in Dunedin require a permit—there is no exemption for owner-builders or DIY scope. Florida Statutes § 489.103(7) allows owner-builders to pull their own permits, but they must meet the same code standards. The opening triggers three code pathways: structural (IRC R602.10—wall bracing recalculation), egress (IRC R310 if the window serves a bedroom), and hurricane impact (Florida Administrative Code 62-2C-3—High Velocity Hurricane Zone). Dunedin adopted the 2020 Florida Building Code, which references the 2018 IRC with Florida amendments. The city's administrative code (Chapter 22) requires all residential exterior projects over $1,000 in valuation to submit sealed plans or engineer-stamped calculations for structural modifications. A new window opening always exceeds this threshold if a header is required, because removing wall material and installing a lintel is a structural alteration.
The hurricane-impact requirement is Dunedin-specific and non-negotiable. Dunedin lies wholly within the HVHZ, meaning all glazing facing the exterior must be impact-rated to the design wind speed (typically 160 mph three-second gust for residential in Pinellas County). This is not a preference—it is code. Your permit plans must show the window's impact rating certification (e.g., ASTM D3161 or ANSI Z97.1 + ASTM F1233, with a HVHZ label), the design pressure (DP) rating, and upright-frame certification. Single-pane, standard tempered glass will be rejected during plan review. If you're upgrading to impact glass, the cost jumps $200–$400 per window versus standard dual-pane, but it is unavoidable in Dunedin. The city's Plan Review Section will not issue a building permit until the window's impact certification is documented on the elevation detail.
Header sizing is the second structural lynch-pin. IRC R612.2 specifies that a lintel (header) must be designed to support the load from roof and wall above. For a single-story house, a 2x6 or 2x8 may suffice; for two-story with load-bearing wall, you often need a built-up 2x10 or larger, or a steel lintel. Dunedin's code requires that a structural engineer or registered architect sign off on the header calculation if the opening is in a load-bearing wall and spans more than 4 feet. Many homeowners skip this and submit a generic "2x10 header" note, which draws a rejection and plan revision. You need either a one-page engineer's letter (cost: $150–$300) or rely on span tables in IRC R502.5 if the span is short. Wall bracing recalculation is the third piece: if you remove a section of wall sheathing or studs to cut the opening, the remaining wall segments must be re-braced per IRC R602.10.2 (lateral bracing of wall studs). A 4-foot opening in a 20-foot wall may seem small, but the code wants confirmation that the intact sections still meet bracing spacing. Many permits get flagged for missing bracing schedules; it's not optional just because the opening is small.
Dunedin's online permit portal (accessible via the city website) accepts residential permit applications 24/7, but human review is 10–14 days standard for any plan-review category. The city does not offer over-the-counter same-day issuance for new openings. You will upload a site plan (showing the location of the opening on the house elevation), a floor plan marking the opening location and dimensions, a detailed elevation showing the window size and header detail, the window's impact-glass certification sheet, and either a header span-table reference or engineer's letter. Incomplete submissions get one round of staff comments (email), then you resubmit; multiple rounds push the timeline to 3–4 weeks. Inspection happens in three stages: rough framing (before drywall closes), exterior cladding (flashing, housewrap, sealant), and final (with the window installed). If the header or bracing fails framing inspection, removal and rework are required before you can proceed.
Costs break down as follows: permit fee is typically $150–$300 (based on a percentage of project valuation, usually 0.75–1.5% of estimated construction cost); engineer's letter or structural calculations $150–$300 (if required); impact-rated window upgrade $200–$400 per unit over standard glass; and contractor labor for framing, header installation, flashing, and caulking $800–$2,500 per opening depending on wall type and complexity. Dunedin does not charge separate inspection fees; they are rolled into the permit fee. Total out-of-pocket for a single bedroom window (load-bearing wall, impact glass, engineer-stamped header) typically runs $1,200–$3,000 including all labor and materials. A non-load-bearing wall partition (like an interior stairwell to the second story) can be cheaper ($600–$1,200) because the header is simpler and bracing recalc may be waived.
Three Dunedin new window or door opening scenarios
Dunedin's HVHZ hurricane-impact glazing requirement—why it costs more and why it matters
Dunedin sits in Pinellas County's High Velocity Hurricane Zone, a designation established by Florida Administrative Code 62-2C-3. This overlay district covers all coastal Florida communities with a design wind speed of 160+ mph (3-second gust). The rule requires that all windows, doors, and skylights facing the exterior carry an impact rating—meaning they must pass ASTM D3161 large-missile impact test or equivalent. A standard dual-pane tempered window is not impact-rated; it will not pass. The certification requires a laminated interlayer (usually polyvinyl butyral or PVB) that holds the glass together if it breaks, preventing wind-borne missile penetration and sudden pressurization of your home.
On the permit plan, you must provide the window manufacturer's HVHZ label or product data sheet. This sheet shows the impact rating (often labeled 'Miami-Dade County approval' or 'HVHZ certification'), the design pressure (DP) rating (DP35, DP50, DP60, etc.), and the upright frame certification (if it is a door, you also need the door frame and threshold rated). If your plan shows a standard window with no HVHZ label, the city's Plan Review Section will reject it with a request for 'impact-rated product data sheet.' Many contractors and homeowners delay here, thinking they can 'upgrade later'—but the permit will not issue until the product is specified. Cost impact: a standard dual-pane insulated window runs $150–$250 retail; an HVHZ-rated equivalent runs $350–$600, depending on size, style (casement, slider, awning), and manufacturer. For a 36x36 casement, expect $450–$550 HVHZ versus $200–$300 standard. Builders often source impact glass from Miami-area suppliers (Miami-Dade, Pasco, Hillsborough) because coastal competition has driven pricing lower than inland Florida. Dunedin is only 20 miles from Tampa, so supply is good and lead times are 1–2 weeks.
The HVHZ requirement also triggers design wind-speed certification. Your permit plans do not need to recalculate wind pressure (that is the window manufacturer's responsibility), but the window's DP rating must match or exceed the design wind speed for your location. Pinellas County's design wind speed is typically 160 mph for residential (3-second gust, 50-year recurrence). A DP60 window is adequate for this exposure; a DP35 is marginal and may trigger plan comments. If your home is in a wind-borne debris region (within 1 mile of the coast), the requirement may push to DP70 or higher, but Dunedin's design wind speed is the baseline. Check your window spec sheet under 'design pressure' to confirm alignment; if it is under-rated, you will get a revision request.
Structural header sizing and wall-bracing recalculation—what the inspector looks for
A new window opening is a structural alteration: you are removing wall material and installing a lintel (header) to carry the load above. IRC R612.2 specifies that the lintel must be designed and installed to carry the maximum roof and wall load. In a single-story colonial or ranch home, a 2x6 or 2x8 header is often adequate for a 3-foot opening; for 4–5 feet, a 2x10 is typical. In a two-story home with a load-bearing exterior wall, you may need a built-up 2x10 or a 2x12, or even a steel angle or I-beam. Dunedin's code (Chapter 22) requires that any opening in a load-bearing wall greater than 4 feet in a single-story, or 3 feet in two-story, must have a structural engineer's calculation or a reference to IRC span tables. Many DIY or inexperienced contractors guess at the header size or assume '2x10 is always safe'—this draws a framing inspection failure.
During framing inspection, the inspector will: (1) verify the header size matches the plan, (2) confirm the header bears fully on the trimmer studs on both sides (no gaps), (3) check that king studs and trimmer studs are intact and properly nailed or bolted, and (4) confirm that the header is level and flush with surrounding framing. If you have used a 2x8 but your plans call for a 2x10, inspection fails and you must replace it—a costly and disruptive remedial framing activity that delays project 1–2 weeks. Wall bracing recalculation is the second piece: when you remove a 4-foot section of wall sheathing (OSB or plywood) to create the opening, the remaining wall segments must still meet lateral-bracing requirements per IRC R602.10.2. If your wall previously had continuous OSB sheathing, now it has two segments (left and right of the opening). Each segment must be independently adequate for bracing—typically this means each segment must be at least 4 feet wide, or the full wall must have alternative bracing (diagonal let-in braces, structural sheathing at corners, etc.). A small opening in a long wall rarely triggers bracing failure, but if the opening is wide or the wall is short, you may need additional bracing. Some contractors add diagonal braces or metal hold-downs to satisfy code; others must move the opening location to maintain adequate brace spacing. This is why Dunedin's Plan Review Section requests 'wall bracing schedule' and 'bracing plan detail'—they want proof that bracing is adequate after the opening is cut.
Cost-wise, an engineer's header letter runs $150–$300 and takes 3–5 days to obtain (engineer reviews your house framing, span, load, and provides a stamped letter saying 'the proposed 2x10 header at the location shown on the plan is adequate'). A span-table reference is free if you do the research yourself (IRC R502.5 provides tables for lumber grade, spacing, and span), but you must include a note on your plan like 'Header: 2x10 #2 Douglas Fir, 4-foot span per IRC R502.5 Table, adequate for roof load.' If you hire a structural engineer for a full bracing recalc as well, the fee jumps to $400–$600. For a straightforward 3–4 foot opening in a single-story, an engineer's letter is usually sufficient. For a wide opening or a two-story wall, a full bracing plan is safer and avoids inspection fails.
Dunedin City Hall, 373 Douglas Avenue, Dunedin, FL 34698
Phone: (727) 298-3050 (verify current number with city website) | https://www.dunedinfl.net (Building Department link; online permit portal accessible from city website)
Monday–Friday, 8:00 AM–5:00 PM (closed holidays)
Common questions
Can I just replace my window without a permit if I keep the opening the same size?
Possibly. If you are replacing an existing window with a new one in the same rough-opening size, and you are not modifying the frame or header, Florida Statutes § 553.901 may exempt you. However, Dunedin requires you to submit a simplified replacement permit application showing the old and new window dimensions to confirm no enlargement. If you enlarge the opening even by a few inches, it converts to a new-opening project requiring full plan review. The safest move is to call the Building Department or submit a pre-app inquiry online before starting work.
Do I need impact glass for a window on the back of my house, away from the coast?
Yes. Dunedin is entirely within the HVHZ overlay. All exterior windows must carry HVHZ certification and impact rating, regardless of orientation or proximity to water. Front, back, side, or roof exposure—it does not matter. The code does not grant exemptions for less-exposed walls. Single-pane or standard tempered glass will be rejected on the permit plan.
How long does it take to get a permit after I submit my application online?
Initial review and approval typically takes 10–14 days for a new window or door opening. If the plans are complete and show all required details (header calc, impact-glass cert, flashing detail), approval is on the shorter end. If details are missing, the city issues one round of comments via email, and you resubmit—this cycle adds 5–7 days. Expect 2–3 weeks from submission to permit issuance if there are no major revisions.
My wall is non-load-bearing. Do I still need an engineer's letter for the header?
Not necessarily. A non-load-bearing wall (interior partition, second-story floor joist, etc.) can use a simpler header per IRC R603 stud tables. Many non-load-bearing openings only require a 2x4 header with minimal blocking, and you can reference the IRC table on the plan instead of getting an engineer's letter. However, you still must show the header detail and cite the IRC table source. If you are unsure whether your wall is load-bearing, have a contractor or engineer inspect before submitting the plan.
What is the difference between DP35, DP50, and DP60 impact glass?
DP stands for 'design pressure' rating, measured in pounds per square foot. DP35 is the minimum for non-HVHZ areas; DP50 and DP60 are higher strength ratings for hurricane zones. Dunedin's design wind speed (160 mph) typically requires DP60 windows, though DP50 may be acceptable in some cases. Check your window's product data sheet to confirm the DP rating matches or exceeds your area's design wind speed. Higher DP means thicker laminated glass and higher cost, but also better wind-pressure resistance.
Can I hire a non-licensed contractor to do this work?
In Florida, window and door installation falls under 'building construction' and may require a licensed contractor depending on the scope and cost. If the work involves structural framing (header installation, wall bracing), a licensed contractor (Class B Building Contractor or specialty license) is typically required. Owner-builders are allowed to pull their own permits under Fla. Stat. § 489.103(7), but they must meet all code standards and can only do the work on their own residential property. If you hire someone other than a licensed contractor or yourself as owner-builder, the permit becomes non-compliant and may be suspended. Check with Dunedin Building Department for scope-specific requirements.
What happens during the framing inspection?
The inspector will verify that the header size matches the plan, confirm that it sits fully on the trimmer studs with no gaps, check that king studs and trimmers are properly nailed or bolted, and confirm that the header is level. The inspector also looks at any wall bracing modifications you made to ensure adequate lateral support. If the header is undersized, undersized, or improperly installed, the inspection fails and you must correct it before proceeding. This is why accurate plan details are critical—errors caught at inspection are expensive to fix retroactively.
Is there an exemption for small openings, like a small pantry window?
No. All new window and door openings in Dunedin require a permit, regardless of size. Even a small 18x18 inch opening triggers the structural (header) and hurricane-impact (glazing) code pathways. There is no 'de minimis' exemption in Dunedin. Small openings are actually faster to permit than large ones (simpler header, smaller impact-glass cost), but they are not exempt.
My builder says the window doesn't need a permit because it's cosmetic. Is that true?
No. Any structural opening in an exterior wall—whether it is a small decoration or a large door—requires a permit. The fact that a window might be decorative does not exempt it from structural, egress, or hurricane-impact code. If a contractor tells you a permit is not needed for a new opening, that is a red flag. Ask for it in writing and verify with the Building Department before proceeding.
Can I get an expedited permit review if I pay more?
Dunedin's Building Department does not offer paid expedited review for standard residential permits. Plan review timelines are 10–14 days for new openings. If you need faster turnaround, you could hire a plan-review consultant to pre-screen your drawings before submission (catches errors that would trigger revision requests), but this does not speed the city's review. Some municipalities offer expedited service for commercial or high-value projects; Dunedin does not advertise this for residential. Check the city website or call the Building Department to ask if options exist for your specific project.