Home Additions in Evans, CO

What Makes Evans Additions Different from Other NoCo Cities

GIMA Renovation designs and builds home additions across every Evans neighborhood — from master suite additions on 1970s central Evans ranches to ADUs for multigenerational families, sunroom additions in Tuscany, and Zone AE elevation-compliant additions for properties in the South Platte floodplain. Evans home additions have a specific profile that sets them apart:

• Post-2013-flood FEMA map updates created new Zone AE properties. Certain Evans properties — particularly along the South Platte corridor in Sandhill, Riverside, and other low-lying neighborhoods — were moved from Zone X (low-to-moderate risk) into Zone AE (high risk with mapped Base Flood Elevations). Additions on these properties now require BFE+1 elevation compliance, adding $15,000-$40,000+ to base cost.
• Master suite additions are the most-requested Evans project type. The 1960s-1980s ranches that dominate central Evans typically have a small original primary bedroom and a shared bathroom — below modern expectations. Adding a 350-500 sq ft master suite (bedroom + bath + walk-in closet) transforms the home.
• HB 24-1152 ADU rules apply to Evans. Evans is a state-defined “subject jurisdiction” (metropolitan planning area population over 1,000), required to allow one ADU per single-unit detached dwelling with minimum 750 sq ft size and 5-foot side/rear setbacks. Administrative approval only.
• Multigenerational ADU demand is unusually high in Evans. Evans has higher rates of multigenerational living than other NoCo cities, which makes attached ADUs and in-law suites particularly relevant.
• Evans is the most affordable NoCo market. Median home value ~$349k. Addition ROI math is different here than Windsor or FC — the value-per-square-foot ceiling is lower, so additions need to deliver real use value to make financial sense.
• City of Evans permits through CitizenServe — 2-4 weeks plan review per round, plus floodplain development permit if applicable.
• 10-minute response from our Greeley shop for site visits and any damage that surfaces during demo.

Evans Home Addition Services We Offer

What an Evans Home Addition Costs in 2026

Evans addition costs reflect the affordable NoCo market and the City's mix of 1960s-1980s ranches with smaller footprints, newer subdivisions, and 2013-flood-affected properties that may carry additional Zone AE elevation requirements. Realistic 2026 Evans ranges:

• Three-season sunroom — $15,000 to $45,000. Insulated foundation, framed walls with large windows, durable roof. Not winter-conditioned. 150-250 sq ft typical. Construction: 6 to 10 weeks.
• Four-season room — $30,000 to $80,000. Fully insulated and conditioned. 200 sq ft: $25,000-$60,000. 400 sq ft: $50,000+. Construction: 8 to 14 weeks.
• Ground-floor room addition — $225 to $360 per sq ft. 200-400 sq ft: $45,000 to $144,000. Construction: 12 to 20 weeks.
• Master suite addition (the Evans specialty) — $80,000 to $120,000. 400 sq ft typical: bedroom + master bath + walk-in closet. Construction: 16 to 24 weeks. The most-requested Evans addition.
• Kitchen / great-room expansion — $80,000 to $200,000. 300-500 sq ft. Construction: 16 to 24 weeks.
• Second-story addition — $200 to $500 per sq ft. 800-1,500 sq ft: $160,000 to $750,000+. Construction: 24 to 36 weeks.
• Attached ADU — $80,000 to $200,000. Minimum 750 sq ft under HB 24-1152. Bedroom + bathroom + kitchenette + separate entrance. Construction: 16 to 28 weeks. Lower cost than Windsor or FC because Evans tier-appropriate finishes.
• Detached ADU / backyard cottage — $150,000 to $300,000+. Freestanding structure with own foundation, framing, roof, and utility connections.
• Multigenerational in-law suite — $60,000 to $150,000. Attached suite for parents, adult children, or extended family. Common Evans project type.

Evans-specific cost adders:

• Zone AE BFE+1 elevation requirement for Sandhill, Riverside, and other South Platte floodplain properties: $15,000 to $40,000+ depending on existing foundation height and required elevation. Required by Colorado floodplain code for any new residential structure or addition in mapped Zone AE.
• Floodplain Development Permit through City of Evans for Zone AE additions: included in our scope coordination.
• Elevation Certificate from a Colorado-licensed surveyor: $400-$1,000.
• Re-siding the original house to match new addition if original siding is at end of life: $5,000-$20,000 depending on house size and material.
• Engineering stamps: $1,500-$5,000 for second-story or structural additions.
• City of Evans permit fees: $50 plan review + $75 admin fee + permit fees based on project value.

Master Suite Additions: The Evans Specialty

Master suite additions are the single most-requested Evans home addition project we run. The reason: nearly every 1960s-1980s ranch and split-level in central Evans (south of 37th Street, Country Club, downtown Evans) was built with a small primary bedroom and a shared bathroom— well below what modern households expect.

A typical Evans master suite addition includes:

• Bedroom (200-300 sq ft) — large enough for king bed, dressers, seating area.
• Master bathroom (80-120 sq ft) — walk-in shower, dual vanity or single vanity, separate water closet optional.
• Walk-in closet (40-80 sq ft) — double-rod hanging, drawers, shoe storage.
• Tie-in to existing house — through what was previously an exterior wall, often a window or door location that gets relocated.
• Matching siding, roof, trim so the addition reads as part of the original house.
• HVAC extension — new branch off the existing system, or dedicated mini-split for the suite.
• Plumbing tie-in — new bathroom drain to main stack, supply lines from existing system.
• Electrical — new circuits for bathroom, bedroom outlets, ceiling fan, walk-in closet lighting.

Typical Evans master suite addition cost:$80,000 to $120,000 for 400 sq ft total. Lower end if you're tying into existing plumbing easily and the original siding is still in good shape. Higher end if you need to relocate existing utilities, re-side the original house to match, or include premium finishes.

Construction timeline: 16 to 24 weeks total (4-6 weeks design, 4-6 weeks permits, 12-16 weeks construction).

FEMA Zone AE Elevation Requirements: Critical Evans Knowledge

One of the most important things to know before planning an Evans home addition: post-2013-flood FEMA map updates moved certain Evans properties from Zone X (low-to-moderate risk) into Zone AE (high risk with mapped Base Flood Elevations). Properties along the South Platte corridor — particularly in Sandhill, Riverside, and other low-lying neighborhoods — now face specific elevation requirements for any new construction or addition.

What this means for Evans additions:

• Residential additions in Zone AE must be built with the lowest floor (including basement) at minimum 1 foot above the Base Flood Elevation (BFE+1). This is required by Colorado floodplain code, administered by the City of Evans through Floodplain Development Permits.
• For non-residential structures, the lowest floor and all electrical, heating, ventilation, plumbing, and air conditioning equipment must be elevated to BFE+1 OR designed watertight to BFE+1.
• Elevation Certificate from a Colorado-licensed surveyor is required at design phase and again at completion. Cost: $400-$1,000.
• Floodplain Development Permit issued through the City of Evans in addition to standard building permit. Adds 2-4 weeks to permit timeline.
• Cost impact: elevation requirements add $15,000 to $40,000+ to the base addition cost depending on the existing foundation height and required elevation. The cost goes to foundation work (taller stem walls, extended footings, additional fill, retaining walls in some cases) and to redesigning the tie-in to the existing house.
• Insurance impact: Zone AE properties require flood insurance through the National Flood Insurance Program. Building to BFE+1 may qualify the property for lower flood insurance premiums than building at or below BFE.

We pull the flood-zone determination during the feasibility phase so you know the elevation requirement (and cost impact) before design starts. Skipping this step and discovering Zone AE requirements after design is a major rework risk. If you're in Sandhill, Riverside, or along the South Platte corridor, assume Zone AE applies until we've confirmed otherwise.

HB 24-1152 ADUs in Evans

Effective June 30, 2025, Colorado HB 24-1152 requires Evans (a state-defined “subject jurisdiction”) to allow one ADU per single-unit detached dwelling in any zone that permits single-family homes. State-baseline requirements Evans must allow:

• Minimum size: 750 sq ft. Evans cannot set a maximum below this.
• Setbacks: Side and rear setbacks reduced to 5 feet (state minimum). Evans cannot require more.
• Approval process: Administrative only. No public hearings, no subjective design review.
• One ADU per single-unit detached dwelling lot.
• Short-term rentals may have additional restrictions per Evans municipal code (long-term rentals generally allowed).

Why Evans ADU demand is unusually strong:

• Multigenerational household demographic — Evans has a higher rate of multigenerational living than other NoCo cities. ADUs let parents, adult children, or extended family live on the same property with their own space.
• Affordable rental income opportunity — lower acquisition cost in Evans means ADU rental income hits a higher ROI percentage than the same ADU in Windsor or Fort Collins.
• Aging-in-place support — ADUs let aging parents stay independent on the same property.

For the full ADU framework and how it compares to other NoCo cities, see our Loveland home additions page (waived ADU fees) and Fort Collins home additions page (BDR review framework).

Evans Neighborhood Addition Specialties

• Tuscany. Newer east-side subdivision past US-85. Less common addition demand because homes are already well-sized. Occasional master suite expansions or sunroom additions.
• Hunters Reserve. 1990s-2000s homes. Sunroom additions, basement-to-ADU conversions, garage-to-living-space conversions.
• Country Club. Established 1970s-1990s golf-course corridor. Heavy master suite addition demand. ADUs for aging-in-place. Multigenerational suites.
• River Run. Newer neighborhood near South Platte. Flood-zone review applies. Sunroom additions, master suites.
• Sandhill & Riverside. 2013-flood-affected. Zone AE elevation-compliant additions. Often paired with broader flood-recovery work. See Evans water damage restoration page.
• Central Evans (south of 37th Street). 1960s-1980s ranches. The master suite addition capital of Evans. Multigenerational in-law suites. Garage conversions.
• Downtown Evans. Pre-1950 homes. Additions less common due to tight lots, but in-law suite conversions of existing structures occur.
• Agricultural-edge properties. Farmhouse master suites, multigenerational suites, garage conversions, occasional second-story additions.

The City of Evans Addition Permit Process

• Concept & feasibility (2-4 weeks). We confirm your lot allows the addition you want, check setbacks, run flood-zone determination (critical for South Platte corridor), identify utility constraints.
• Design & engineering (4-8 weeks). Architectural drawings, structural engineer stamps. Elevation Certificate from surveyor if Zone AE.
• City of Evans permit submittal through CitizenServe online portal.
• Plan review (2-4 weeks per round). Most clean submittals clear in one round.
• Floodplain Development Permit if applicable (Zone AE properties): adds 2-4 weeks.
• Construction (12-32 weeks) depending on scope.
• Inspections. Foundation, framing, electrical, plumbing, mechanical, elevation verification (for Zone AE), final.
• Permit fees: $50 plan review + $75 admin fee + permit fees based on project value.
• Payment heads-up: permits valued above $1,500 must be paid by check or e-check, not credit card.
• Final Elevation Certificate required at completion for Zone AE additions.

Why Evans Homeowners Choose GIMA Renovation for Additions

• One contractor for everything — design, engineering, foundation, framing, roof, siding, MEP, drywall, paint, flooring, finish.
• FEMA Zone AE BFE+1 elevation experience — critical for Sandhill, Riverside, and other South Platte floodplain properties.
• Master suite addition specialty — the most-requested Evans addition type for 1960s-1980s ranches.
• HB 24-1152 ADU implementation experience — we know the state baseline rules and how Evans applies them.
• Multigenerational in-law suite specialty — matched to the Evans demographic.
• City of Evans permit experience — CitizenServe portal, Floodplain Development Permits, 2-4 week plan review.
• Foundation & concrete work in-house through our concrete crew — critical for Zone AE elevation builds.
• 10-minute drive from our Greeley shop — fast site visits, fast crew dispatch.
• Architectural-character matching for 1970s ranches so additions read as part of the original house.
• Built for Evans budgets — honest line-item scopes, tier-appropriate materials.

Frequently Asked Questions

How much does an Evans home addition cost?

Sunroom $15k–$80k; master suite (400 sq ft) $80k–$120k; ground-floor addition $225–$360/sq ft; multigenerational suite $60k–$150k; attached ADU $80k–$200k; detached ADU $150k–$300k+; second-story $200–$500/sq ft. Zone AE elevation: +$15k–$40k+.

Can I build an ADU in Evans?

Yes — under HB 24-1152 (effective June 30, 2025). Minimum 750 sq ft, 5-foot setbacks, administrative approval. One ADU per single-unit detached dwelling.

Is my Evans property in Zone AE?

Possibly — post-2013 FEMA map updates moved some Evans properties from Zone X to Zone AE, particularly along the South Platte corridor (Sandhill, Riverside). If yes, additions require BFE+1 elevation (adds $15k-$40k+) plus Floodplain Development Permit. We pull the flood-zone determination during feasibility.

What types of additions do you build?

All common types — master suites (Evans specialty), room additions, sunrooms, four-season rooms, ADUs (attached and detached), multigenerational in-law suites, second-story additions, garage conversions, Zone AE elevation-compliant builds.

How long does an Evans addition take?

4 to 9 months total. Master suite 5-7 months. ADUs 6-9 months. Second-story 7-10 months. Floodplain Zone AE adds 4-8 weeks.

Will my addition match the existing house?

Yes — especially important on 1970s ranches where the goal is for the addition to read as if it's always been part of the house. We match siding, brick, trim, roof pitch, shingle color, and window style.

Which Evans neighborhoods do you build additions in?

All of them — Tuscany, Hunters Reserve, Country Club, River Run, Sandhill, Riverside, central Evans (south of 37th Street), downtown Evans, ag-edge properties.

Ready to Plan Your Evans Addition?

Call (970) 836-4334 to schedule a free on-site walkthrough, or send a message through our contact page with your address and project details. We'll check FEMA flood-zone status (critical for South Platte corridor properties), identify ADU eligibility, walk through master suite addition options if you're in a 1970s ranch, and send a written, line-item estimate within a few business days — no pressure, no obligation.

See also: all our Evans services, our main home additions page, Loveland home additions (waived ADU fees), Fort Collins home additions (BDR review), Windsor home additions (3 ADU types), or other Northern Colorado service areas.