Fast, Reliable New Detached ADU Across Melbourne
A new detached ADU in Melbourne typically costs $210,000 to $360,000 all-in, from the first site survey through final inspection. The timeline runs 7 to 13 months, and the two factors that stretch both numbers more than anything else are Brevard County’s septic-density rules and Melbourne’s 130+ mph wind-zone engineering requirements. We’re Ellery ADU Studio, a design-build practice that has delivered 900+ ADUs since 2015, and we handle every Melbourne project under one contract at one written price. Call (971) 497-2402 and you’ll get a written price before any work starts, not a callback promise.
Why Ellery ADU Studio Is Melbourne’s Preferred New Detached ADU Company
Melbourne homeowners come to us after reading every estimate they can find, and the first thing they notice is what’s missing from our process: change orders. Under The Haven Standard, Clause 1, every project gets a written price before work begins. That price covers the drawings, the permit set, the septic evaluation if needed, the wind-load engineering, and the construction itself. No separate designer’s fee that “might” align with builder pricing. No two contracts pointing at each other when something’s off.
Our crews work in the Eau Gallie district, along Wickham Road, and throughout neighborhoods east of US-1 where the 1960s CBS ranch stock dominates. We know what a 4-inch slab on those lots means for your foundation line item. We know which of those original 100-amp panels can support a mini-split and which need a service upgrade before the county inspector arrives. That knowledge gets priced into your written quote on day one, not discovered on week 14.
Nadia Ellery, our founder, has run this studio since 2015. She built it around a simple rule: the permit set is the product, not an afterthought. Every Melbourne ADU we deliver includes a documented photo record of every visit and a 365-Day Done Right Promise in writing. If it isn’t built to the permitted drawings, we make it right. That’s not a slogan. It’s Clause 9.
The studio’s dispatch and scheduling for Melbourne is coordinated from our Miami (South FL) office, and our crews serve Melbourne locally. When you call (971) 497-2402, a live person answers. Not a voicemail queue.
Our New Detached ADU Services in Melbourne
Custom Built ADU
Custom-built detached ADUs in Melbourne run $240,000 to $360,000, depending on square footage, foundation scope, and finish level. These are site-built from the slab up, engineered to the Florida Building Code’s wind-borne debris standards for Brevard County. On Melbourne’s typical 8,000 to 12,000 sq ft 1960s lots, we can often position a 600 to 900 sq ft ADU without a zoning variance, but the septic evaluation is the gate you can’t skip. We handle that evaluation, the drain-field expansion if Brevard County requires one, and the permit set as one package under our New Detached ADU contract.
1-Bed & 2-Bed ADU
A 1-bed detached ADU in Melbourne typically runs $210,000 to $290,000. A 2-bed runs $270,000 to $360,000. The jump isn’t just the extra bedroom. It’s the additional loading on a 1960s septic system that was permitted at the minimum drain-field size for one unit. Two bedrooms means more occupants, which under Brevard County rules means a higher flow estimate, which is precisely why a drain-field expansion shows up on so many Melbourne permit sets. We price that in your written quote from the start. No door-side surprise on week 9.
Prefab ADU Installation
Prefab detached ADUs in Melbourne run $190,000 to $310,000 delivered, set, and finished. We specify and coordinate systems from Abodu, Cover, and Dvele within the same single contract. But here’s what matters for Melbourne specifically: prefab units assembled on-site still face wind-load engineering and salt-air material requirements that a factory in another state won’t account for. We spec stainless fasteners and marine-grade electrical enclosures for any ADU within two miles of the Indian River Lagoon or the Atlantic, and that line item is in your written price. Not a post-delivery revision.
Studio ADU
A studio detached ADU in Melbourne starts around $180,000 and typically lands between $190,000 and $240,000. These compact footprints, usually 400 to 550 sq ft, fit easily on the city’s larger CBS ranch lots without a variance. The catch in Melbourne is rarely the footprint. It’s whether the existing septic system can absorb another dwelling at all. We run the septic evaluation early, before you spend money on drawings that Brevard County may not approve without a drain-field expansion. That sequencing saves Melbourne homeowners thousands.
What happens when you call
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A real person answersNo phone trees - you reach a local pro.
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You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in Melbourne
We specify and coordinate prefab and modular ADU systems from Abodu, Cover, and Dvele for Melbourne clients, along with Mighty Buildings where the foundation and site constraints align. We maintain deep familiarity with each system’s engineering documentation, which means the wind-load and corrosion specifications Melbourne requires get baked into your permit set rather than patched on after delivery. For salt-air exposure near the lagoon, our standard spec calls for James Hardie fiber cement siding with stainless fasteners. That’s not an upsell. It’s the difference between a wall assembly that passes county inspection and one that rusts through by year five.
Common New Detached ADU Problems We See in Melbourne Homes
- Septic retrofit delays. Homeowners assume the existing drain field can absorb a second dwelling. Brevard County often requires a full septic evaluation and system expansion before issuing a permit. That adds weeks and $8,000 to $25,000 to the project, and it’s the single most common surprise on Space Coast ADU jobs.
- Wind-zone underbidding. Out-of-town contractors quote interior-county pricing, then hit you with change orders for the 130+ mph roof-to-wall connections and impact-rated windows Melbourne’s wind-borne debris region demands. Your written price from us includes that engineering from the first line item.
- Salt-air corrosion. Standard galvanized fasteners and non-marine-grade electrical enclosures rust prematurely within two miles of the Indian River Lagoon or the ocean. Failed inspections follow. We specify marine-grade materials up front, and it’s written into your quote.
- 100-amp panel overloads. Melbourne’s 1960s CBS ranch homes were built for one dwelling’s electrical load. Add a kitchenette and a mini-split ADU, and the math stops working. We identify the service upgrade need early, price it, and complete it before the county inspector signs off.
Pricing for New Detached ADU in Melbourne, FL
A detached ADU in Melbourne, drawings through final inspection, ranges from $180,000 for a compact studio to $360,000 for a well-finished custom 2-bed. Here’s how that breaks down in this market: site work and foundation run $25,000 to $55,000; septic evaluation and typical drain-field expansion run $8,000 to $25,000; wind-load engineering and impact-rated openings run $12,000 to $30,000; framing through dry-in runs $60,000 to $110,000; and mechanical, electrical, plumbing, and finishes run $75,000 to $140,000. The variables that move you within each range are salt-air material specs, panel upgrades, and whether your lot is on municipal sewer or septic. We’re one of the only ADU studios that puts these ranges in writing before you sign anything. Call (971) 497-2402 for your free written estimate, and if you already have an estimate in hand, bring it. We’ll give you a free second opinion on it.
We Also Serve Cities Near Melbourne
Beyond Melbourne, our New Detached ADU team takes projects in Kissimmee, Orlando, Lakeland, and Daytona Beach. Each city has different septic and wind-zone realities, and your written price from us reflects the municipality where your lot actually sits. If you’re weighing a build anywhere in central Florida, call (971) 497-2402 and we’ll tell you what’s different about your specific lot before you spend a dollar on drawings.
Serving Melbourne, FL - Our Local Coverage Area
We’re based in the Melbourne area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs - New Detached ADU in Melbourne
Not always, but more often than not. Eau Gallie’s 1960s CBS ranch homes were typically permitted at the minimum drain-field size for one dwelling. When Brevard County reviews your ADU permit application, they calculate added flow from the second dwelling. If the existing drain field can’t handle the combined load, a system expansion is required before the permit is issued. We run the septic evaluation early, before drawings, so you know in the first two weeks whether this $8,000 to $25,000 line item applies to your lot. Call (971) 497-2402 and we’ll walk you through the sequencing for your specific property.
Every detached ADU in Melbourne must be engineered to the Florida Building Code’s wind-borne debris standards for Brevard County, which sit at 130+ mph design wind speed. In practice, that means rated roof-to-wall connections, impact-rated windows and doors, and structural sheathing specified for high-wind uplift. Contractors unfamiliar with coastal Florida often leave this out of early quotes and add it back as a change order. We include the wind-load engineering and the rated materials in your written price from the first quote. Call (971) 497-2402 to get a real number, not an estimate that inflates on week 8.
Salt air accelerates corrosion on fasteners, roofing underlayment, and electrical enclosures. For any ADU within two miles of the Indian River Lagoon or the Atlantic, we specify stainless or marine-grade fasteners, corrosion-resistant electrical boxes, and James Hardie fiber cement siding where exposure is significant. These choices add roughly $4,000 to $12,000 to a project, depending on proximity and exposure. They also prevent the failed inspections and premature rust that standard galvanized materials generate in Melbourne’s coastal zone. Call (971) 497-2402 to get a written quote with material specs that match your lot’s actual salt exposure.
In most cases, yes. Florida’s 2023 ADU preemption law, HB 1339, compels Melbourne to allow ADUs by-right in single-family zones. On the city’s common 8,000 to 12,000 sq ft 1960s lots, a single-level 600 to 900 sq ft ADU with zero-threshold entries, blocking for grab bars, wider doorways, and slip-rated surfaces can usually be positioned within standard setbacks. The more frequent gate isn’t zoning. It’s septic capacity under Brevard County rules. We handle both checks early, so you know whether your aging-in-place ADU needs a variance, a drain-field expansion, or neither. Call (971) 497-2402 for a written answer on your lot.
Permit review and approval typically takes 10 to 18 weeks when a septic expansion is part of the package. The septic evaluation itself runs 2 to 4 weeks, and if Brevard County requires a drain-field expansion, the additional permitting and system design work adds 6 to 10 weeks on top of the standard building permit timeline. This is the bottleneck that surprises homeowners who budgeted for an Orange County timeline. We sequence the septic evaluation first, which means your drawings and engineering are completed while the county processes the septic piece, not after. Call (971) 497-2402 for a schedule based on your lot’s specific conditions.
If you’re planning a new detached ADU in Melbourne, start with a written price that accounts for septic, wind, and salt air on your specific lot. Call (971) 497-2402 to schedule your free estimate. A live person answers.
Written by Nadia Ellery, Owner at Ellery ADU Studio, serving Melbourne since 2015.