Research by DoINeedAPermit Research Team · Updated May 2026
The Short Answer
A full kitchen remodel in Derby requires a building permit if you're moving walls, relocating plumbing, adding circuits, modifying gas lines, venting a range hood to the exterior, or changing window/door openings. Cosmetic-only work—cabinets, countertops, appliance swap on existing circuits, paint, flooring—is exempt.
Derby's Building Department follows the 2015 International Building Code and treats kitchen remodels like any other interior work: the permit threshold hinges on whether you touch structural elements or mechanical-electrical-plumbing systems, not on budget alone. What sets Derby apart from neighboring Kansas cities is its streamlined owner-builder pathway—if you own and occupy the home, you can pull permits yourself without a licensed contractor, which saves fees but requires you to do plan review and inspection legwork in person at City Hall. Derby has experienced significant growth in the past decade, and the building department has responded by tightening plan-review requirements for MEP (mechanical, electrical, plumbing) work to avoid the common trap of undersized circuits or improper GFCI placement that fails inspection. Most full kitchen remodels here trigger three separate sub-permits (building, plumbing, electrical) and sometimes a fourth (mechanical, for ducted range hoods), each with its own inspection. The city does not have an online portal—all permit applications are filed in person or by mail at City Hall, which means you'll want to prepare complete drawings upfront rather than iterating through email.

What happens if you skip the permit (and you needed one)

Derby kitchen remodel permits—the key details

A full kitchen remodel in Derby requires a permit anytime you alter the building's structure or modify plumbing, electrical, mechanical, or gas systems. The threshold is clear: if you move or remove a wall, relocate a sink or dishwasher, add a new circuit, duct a range hood to the exterior, or enlarge a window opening, you need a permit. The building code section that governs this is IRC R101.2 (permits required for work affecting the structural integrity or building systems), and Derby has not deviated from the state's adoption of the 2015 IBC. Cosmetic work—painting, replacing cabinets and countertops in the same footprint, swapping out a slide-in range on the existing circuit, new flooring, new backsplash—is exempt and can be done without filing. The key distinction is whether the work creates a *new* electrical load, moves a *plumbing fixture*, or alters a *structural element*. Many homeowners mistakenly believe a full kitchen remodel automatically requires a permit; in fact, a cabinet and countertop refresh with new appliances plugged into existing outlets and no plumbing moves is cosmetic and is fine without filing.

If your project involves moving walls or removing a load-bearing wall, you must obtain an engineering letter or structural design from a Kansas-licensed engineer before submitting the permit application. IRC R602.1 and R605.1 require that any wall removal or header installation be engineered if it's load-bearing. Derby's building department will not review or approve a load-bearing wall removal without a signed, sealed engineer's letter; this is not optional, and the department strictly enforces it because kitchen wall removals are high-risk for structural failure if undersized. The engineer will specify the required beam size, posts, footings, and details. The cost of an engineer's letter for a modest kitchen wall removal runs $500–$1,500 and can take 1–2 weeks. Do not proceed with framing until you have the engineer's stamp and the building department has reviewed and approved the plan.

Plumbing in a full kitchen remodel must meet IRC P2722 (kitchen drain sizing and trap arms), which requires a minimum 2-inch drain for a sink and proper venting within 6 feet of the trap. If you're relocating the sink, dishwasher, or adding a new wet bar, you need to show drain routing and venting on your plumbing permit drawing. Common rejection reason: venting shown incorrectly or trap arm exceeding code length. The plumbing plan must show all hot and cold supply lines, the main drain, and vent routing. If the existing drain stack is too far away, you may need to install a new vent or pump system (ejector pump), which adds $2,000–$5,000 but is necessary if the drain is more than code distance. Derby's loess soil (west side) and expansive clay (east side) mean that any new exterior penetration for a vent stack or drain must account for frost depth (36 inches in Derby); a vent termination above the roof is required, and the penetration must be sealed and flashed properly.

Electrical work in a kitchen remodel is governed by IRC E3702 (branch circuits), IRC E3801 (GFCI protection), and NEC 210.12 (GFCI on all kitchen countertop receptacles). Any new electrical circuit, panel upgrade, or outlet addition requires a separate electrical permit. The kitchen must have at least two 20-amp small-appliance branch circuits dedicated to countertop outlets, with no other loads on those circuits. Every receptacle within 6 feet of a sink must be GFCI-protected; this includes countertops, island, and bar sinks. The electrical plan must show the location of every outlet, switch, light fixture, and dedicated circuit, along with wire gauge and breaker size. If you add circuits (e.g., for a new dishwasher, disposal, or range), the panel must have space, and you may need a sub-panel if the main panel is full—this adds cost and complexity. Common rejection: outlets shown too far apart (more than 48 inches), GFCI placement not marked, or two small-appliance circuits not clearly labeled.

Mechanical ventilation for a range hood with exterior ducting requires a separate mechanical permit in Derby if the hood is vented to the outside (not recirculating). IRC M1502.1 requires that kitchen exhaust hoods be ducted directly to the exterior and terminated with a dampered vent cap; no flex duct through attics without fire-rating. If you're cutting through an exterior wall or roof to run ductwork, the permit drawing must show the duct route, insulation, and exterior termination detail. The duct must be 6-inch minimum for most hoods, and the termination cap must be accessible for cleaning. If the hood is installed but not ducted to the outside, the permit department will flag it on final inspection and you'll be required to either duct it or switch to a recirculating model (which is not ideal for code compliance but is an option if ducting is not feasible). A ducted range hood retrofit costs $800–$2,000 depending on wall location and duct run length.

Three Derby kitchen remodel (full) scenarios

Scenario A
Cabinet and countertop swap, new appliances, same sink location—south Derby ranch
You're removing 40-year-old cabinets and countertops, installing new ones in the same layout, swapping the old smooth-top electric range for a new slide-in model on the existing 240-volt circuit, and replacing the refrigerator and dishwasher with new units that plug into existing outlets and connect to the existing water and drain lines. No walls move, no plumbing fixtures relocate, no new circuits are added, no gas lines are touched. This is a cosmetic kitchen refresh, and no permit is required. You can purchase and install the materials yourself without filing anything with the city. Cost: cabinets $4,000–$8,000, countertops $2,000–$5,000, appliances $2,500–$5,000, total $8,500–$18,000, zero permit fees. The only document you might want is a receipt from the appliance seller confirming the units are new (for insurance purposes), but it's not required by code. Inspection: none. Timeline: 2–3 weeks for cabinet install and finish work.
No permit required (cosmetic work) | Existing circuits and drains reused | Slide-in range on 240V circuit | Total project cost $8,500–$18,000 | Zero permit fees
Scenario B
Full gut remodel with wall removal, island addition, relocated sink and dishwasher, new circuits—west Derby bungalow
You're removing the wall between the kitchen and dining room (non-load-bearing), installing a 12-foot island with sink and dishwasher, relocating the original sink from the south wall to the island, adding four new 20-amp circuits for island outlets and appliances, and installing a new gas range in place of the old electric range. This requires a full permit. First, you must hire a Kansas-licensed engineer to review the wall removal and provide a letter confirming it's non-load-bearing or providing sizing if it is; cost $300–$800. Then file a building permit (with engineer letter), electrical permit (showing two new 20-amp circuits for small appliances, island receptacles spaced no more than 48 inches apart, all GFCI-protected within 6 feet of sink, and dedicated circuit for gas range ignition/controls), and plumbing permit (showing new 2-inch drain from island sink with proper trap and vent routed to existing stack or a new vent if the distance exceeds code—likely $1,500–$3,000 for a new vent if one is needed). Gas line work must also be permitted and inspected. Permit fees total $400–$900 (building $150–$400, electrical $150–$300, plumbing $150–$300). Inspections sequence: framing (wall removal), rough plumbing (island drain and vent), rough electrical (circuits and outlets rough-in), gas line (if applicable), drywall, final (electrical outlet finish, plumbing fixtures, gas range connection). Timeline: 4–8 weeks plan review plus 4–6 weeks construction. Total project cost $20,000–$40,000; permit fees are a small fraction but required.
Permit required (wall removal, plumbing relocation, new circuits, gas range) | Engineer letter required for wall removal $300–$800 | Island drain/vent new or relocated | Two 20-amp small-appliance circuits | GFCI on all island and countertop receptacles | Gas line inspection required | Permit fees $400–$900 | Total project cost $20,000–$40,000
Scenario C
Kitchen extension with new exterior window, relocated electrical panel, gas line reroute—northeast Derby (clay soil area)
You're adding a 10x12 bump-out to the east side of your kitchen, moving the exterior wall 12 feet outward to gain counter and storage space. This requires a building permit because you're changing a window/door opening (the new wall has a new window), framing new walls (which must meet wind and snow loads per IRC R301), and the new foundation must account for frost depth (36 inches in Derby) and expansive clay soil (common on the northeast side of Derby). Additionally, you're relocating the electrical panel from the kitchen to a new utility closet in the bump-out, which requires a new electrical service routing and inspection, and you're rerouting the gas line to a new cooktop location. This triggers four permits: building (foundation, framing, window opening), electrical (panel relocation, new circuits for bump-out outlets), plumbing (no new fixtures, but gas reroute falls under mechanical), and potentially mechanical (gas line inspection). The building plan must show the new foundation footing depth (minimum 42 inches below grade in Derby to account for 36-inch frost depth plus 6 inches bearing depth), soil bearing capacity, and drainage to handle expansive clay. The engineer may recommend a moisture barrier or special footing design; cost $800–$1,500. Electrical plan must show the new panel location, main disconnect routing, and all circuits. Gas line plan must show the new gas line route with P-trap and drip leg at the new cooktop location per IRC G2406.2. Permit fees: building $300–$500, electrical $200–$350, gas/mechanical $150–$250, total $650–$1,100. Inspections: footing (before pour), framing, window installation, electrical service entrance, gas line, final. Timeline: 5–8 weeks plan review (because of foundation/soil issues) plus 8–12 weeks construction. Total project cost $35,000–$60,000; soil and frost-depth engineering drives much of the cost and timeline.
Permit required (new exterior wall, window opening, electrical panel relocation, gas line reroute) | Foundation must extend 42+ inches below grade (frost depth + bearing) | Expansive clay soil on NE side requires special footing or moisture barrier | Engineer letter $800–$1,500 | Electrical panel relocation adds $2,000–$4,000 | Gas line inspection required | Permit fees $650–$1,100 | Total project cost $35,000–$60,000

Every project is different.

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Derby's owner-builder pathway and plan-review workflow

Derby's Building Department allows owner-builders—homeowners who own and occupy the home—to pull their own permits without a licensed contractor. This is a significant advantage in Kansas, where many neighboring cities (e.g., Andover, Wichita) require a licensed contractor for all mechanical trades. If you qualify as an owner-builder, you can save $500–$1,500 in contractor markup on permit fees. However, owner-builder permits in Derby come with a catch: you must be present for all inspections, and you are responsible for understanding the code and submitting complete, code-compliant drawings. The building department does not provide design assistance or free plan review; they will reject incomplete or non-compliant drawings and require you to resubmit.

Plan review in Derby is in-person at City Hall (no online portal). Bring two sets of drawings (one for the department, one marked up with comments for you). The reviewer will spend 15–30 minutes walking through your drawings, noting issues, and giving you a list of required corrections. Common rejections for kitchen remodels: missing load-bearing wall engineer letter, two small-appliance circuits not labeled, GFCI receptacle locations not marked, plumbing trap arm drawn too long, or range-hood duct termination detail missing. You'll then need to correct the drawings and resubmit, which can add 1–2 weeks to the review cycle if you have to hire a designer or engineer. Budget 3–6 weeks total from first submission to approval, especially if structural or MEP revisions are needed.

Once you receive approval and pay the permit fees, you can begin work. Inspections are scheduled by phone; the inspector will visit your home within 2–3 business days of your call (during normal business hours). For a full kitchen remodel, expect 4–6 inspections: framing (if walls are moved), rough plumbing (drains, supplies, vent before drywall), rough electrical (circuits, outlets, switches before drywall), and final (all systems complete, fixtures installed, GFCI tested). The final inspection is the critical one; the inspector will test all GFCI outlets, verify GFCI labeling, check that the range hood is ducted to the exterior, and confirm that all work matches the approved plan. If anything fails final inspection, you'll need to correct it and request a re-inspection (no additional fee, but delays your project).

Derby's building department is responsive but conservative—they enforce code strictly and do not grant many variances or exceptions for kitchens. If you're pushing the limits (e.g., a very long plumbing drain run, a complex wall removal), get your engineer or designer on board early and include all calculations and details in the permit package. Half-measures or vague drawings will be rejected, costing you time and frustration.

Plumbing, electrical, and gas considerations specific to Derby's climate and soil

Derby straddles two distinct soil zones: loess on the west side and expansive clay on the east side. This matters for kitchen plumbing because any below-slab drain or water line penetration must account for soil movement. Expansive clay (east Derby) can shift seasonally, stressing buried pipes and causing offsets or cracks over time. If your kitchen remodel involves a new or relocated drain line, the plumbing permit drawing should note the soil type and specify either PVC or cast-iron drain with proper bedding and support. Some inspectors in the east-side clay zone will ask you to verify soil boring data or specify a more robust drain installation; be prepared for that question. The 36-inch frost depth in Derby applies to all below-grade penetrations (water lines, drains, sewage), so any new exterior vent stack or drain exit must be installed below the frost line or insulated above ground.

Electrical in Derby is straightforward for kitchens, but the two-20-amp-circuit requirement is non-negotiable and is the single most common point of confusion. Many homeowners assume one 20-amp circuit is enough for countertop outlets; it is not. IRC E3702.12(A) and NEC 210.11(C)(1) require that kitchen counters have at least two 20-amp small-appliance branch circuits. These circuits must be dedicated—meaning they can have only kitchen countertop outlets, the refrigerator, and the dishwasher; no other loads. A common violation is running the microwave or dishwasher on the same circuit as countertop toaster and coffee maker outlets; this overloads the breaker and causes nuisance tripping. The electrical plan must show these two circuits clearly labeled and separate from all other loads. If you're adding an island, the outlets on the island count toward the 48-inch spacing rule, meaning you must have an outlet every 48 inches along the countertop (including the island). Every outlet within 6 feet of a sink must be GFCI-protected; in a modern kitchen with an island sink, this usually means GFCI outlets on the island, the sink wall, and any nearby bar area.

Gas appliance connections in Derby fall under IRC G2406 and require a separate mechanical or gas permit. If you're installing a gas cooktop or range, the gas line must be sized for the appliance's BTU rating (typically 65,000 BTU for a 4-burner range), routed in rigid pipe or approved flexible connector, include a drip leg (a small vertical drop at the end of the line to catch condensate), and a P-trap if the line runs underground or through damp areas. The connection at the appliance must have a gas shut-off valve within arm's reach. The gas inspector will verify that the line is properly sized, trapped, and capped and that the shut-off valve is accessible. Any changes to an existing gas line (rerouting, new takeoff, new regulator) require a permit and inspection. Gas work is not something to DIY; hire a licensed gas fitter and include the gas permit in your application package.

City of Derby Building Department
Derby City Hall, 611 N Mulberry St, Derby, KS 67037
Phone: (316) 788-9511
Monday–Friday, 8:00 AM – 5:00 PM (verify by phone before visiting)

Common questions

Do I need a permit if I'm just replacing my kitchen cabinets and countertops?

No, if the cabinets and countertops are installed in the same footprint and no plumbing or electrical work is done, no permit is required. This is considered cosmetic work. However, if you're removing a cabinet to relocate a sink or dishwasher, or adding a new outlet, a permit is required.

Can I remove a wall between my kitchen and dining room without a permit?

Not in Derby. Even if you believe the wall is non-load-bearing, you must obtain an engineering letter confirming this and submit it with your building permit application. The city will not approve a wall removal without an engineer's signed and sealed letter. This costs $300–$1,500 and is non-negotiable.

What if I hire a contractor—do they pull the permit or do I?

The contractor typically pulls the permit under their license and name, and you reimburse them the permit fees (plus a markup). If you are an owner-builder and the contractor is just a sub (e.g., a plumber hired to do the drain work), you may need to pull the main building permit and the plumbing sub-permit yourself. Clarify this upfront with your contractor.

How much do kitchen remodel permits cost in Derby?

Permit fees depend on the project valuation: building $150–$400, electrical $150–$300, plumbing $150–$300, mechanical/gas $100–$250. Total typically $400–$1,200 for a full remodel. Some cities charge a percentage of project cost (1–2%); Derby uses a flat-fee structure, so confirm the exact amount when you apply.

Do I need to disclose unpermitted kitchen work when I sell my house in Kansas?

Yes. Kansas law (K.S.A. 58-4221) requires sellers to disclose unpermitted improvements on the Residential Real Property Disclosure Statement. Failure to disclose is fraud, and buyers can sue for damages or walk away from the deal. Unpermitted kitchen work is a major red flag that kills buyer confidence and can reduce your sale price by 10–20%.

What happens if the building inspector finds code violations during my kitchen remodel inspection?

The inspector will mark the inspection as 'failed' and issue a notice of violation citing the specific code section. You must correct the violation and request a re-inspection at no additional fee. Common failures: GFCI outlets not present, outlets spaced too far apart, two small-appliance circuits not shown, or plumbing venting improper. Re-inspection typically occurs within 3–7 days of your correction request.

Is my insurance company going to care about an unpermitted kitchen remodel?

Yes, absolutely. If you file a homeowner's insurance claim for damage (fire, water, etc.) related to unpermitted kitchen work, the insurer can deny the claim entirely or reduce the payout. This is one of the largest financial risks of skipping permits; a $20,000 kitchen remodel could result in a $50,000+ insurance denial if something goes wrong.

Can I do a partial kitchen remodel without a permit if I'm careful not to touch any structural elements?

It depends on what you're doing. If you're only replacing cabinets, countertops, and flooring in existing locations, no permit is needed. But if you add any new outlets, relocate any plumbing fixture, install a range hood ducted to the exterior, or modify the electrical panel, a permit is required—even if you touch no structural elements.

How long does a kitchen remodel take from permit approval to final inspection in Derby?

Typically 4–8 weeks of construction, depending on complexity. If you need structural engineering, add 1–2 weeks. Plan-review time (from first submission to approval) is 3–6 weeks. Total project timeline from concept to final inspection: 2–4 months for a straightforward remodel, 3–6 months if walls are removed or major MEP changes are made.

Do I need a separate permit for a range hood if it's recirculating (non-ducted)?

No. A recirculating (ductless) range hood that filters air back into the kitchen is not considered a mechanical exhaust duct and does not require a separate permit under IRC M1502.1. However, a recirculating hood is less effective at removing cooking odors and moisture compared to a ducted hood, which is the code-preferred method. A ducted hood requires a mechanical permit and must vent to the exterior with a dampered cap.

Disclaimer: This guide is based on research conducted in May 2026 using publicly available sources. Always verify current kitchen remodel (full) permit requirements with the City of Derby Building Department before starting your project.

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