Home Additions in Greeley, CO

Greeley's One-Contractor Home Addition

A home addition is the most ambitious project a homeowner takes on short of building a new house. It touches every trade: civil (foundation, grading), structural (engineering, framing), envelope (roofing tie-in, siding match, windows, insulation), mechanical (HVAC extension), plumbing, electrical service capacity, drywall, paint, and flooring — plus zoning review, septic clearance if you're on a system, and the City of Greeley or Weld County building department on every inspection.

GIMA Renovation owns every one of those phases under one contract. Design and engineering coordination, permits and zoning review, footings and foundation, framing and roof tie-in, siding match, electrical and plumbing extensions, HVAC, drywall and paint, flooring, and finish — all delivered by the same team, on one written line-item scope, with one project manager you actually talk to. We're a family-owned Greeley contractor serving Evans, Windsor, Fort Collins, Loveland, and the rest of Northern Colorado.

Home Addition Services We Offer in Greeley

Every Greeley addition starts the same way: an on-site walkthrough, a written scope, and one team that delivers it. We design and build every common attached addition type:

What Does a Greeley Home Addition Cost in 2026?

Home additions have the widest cost spread of any project we run, because the scope itself ranges from a 120 sq ft sunroom to a 1,500 sq ft second story. Here's the realistic per-square-foot range for Greeley and Northern Colorado in 2026, calibrated against Front Range market data and our own project history:

• Three-season sunroom — $80 to $230 per sq ft. Insulated foundation, framed walls with large windows, durable roof. Not conditioned for winter. 150–250 sq ft typical: $15,000 to $45,000. Construction: 6 to 10 weeks.
• Four-season room — $200 to $400 per sq ft. Fully insulated and conditioned. 150–250 sq ft typical: $30,000 to $100,000. Construction: 8 to 14 weeks.
• Ground-floor room addition — $200 to $320 per sq ft. Bedroom, office, or family-room expansion. 200–400 sq ft: $40,000 to $130,000. Construction: 12 to 20 weeks.
• Master suite addition — $250 to $350 per sq ft. Bedroom + bathroom + walk-in closet, typically 350–500 sq ft: $90,000 to $180,000. Construction: 16 to 24 weeks.
• Kitchen / great-room expansion — $250 to $400 per sq ft. Push out the back of the house, often with vaulted ceiling. 300–500 sq ft: $80,000 to $200,000. Construction: 16 to 24 weeks.
• In-law suite / attached ADU — $250 to $400 per sq ft. Bedroom + bathroom + kitchenette + separate entrance. 500–800 sq ft: $125,000 to $320,000. Construction: 20 to 32 weeks.
• Second-story addition — $250 to $500 per sq ft. Full or partial second story, plus engineering upgrades to existing foundation and load path. 800–1,500 sq ft: $200,000 to $750,000. Construction: 24 to 36 weeks.

Colorado-specific cost adders to expect: snow-load framing requirements add 8 to 15% versus lower-elevation builds. High-altitude UV-rated materials, ventilation, and code-compliant insulation add another 5 to 10%. Engineering stamps run $1,500 to $5,000 depending on complexity. Greeley city permit fees and Weld County impact fees vary by project size and are line-itemed separately so there are no surprises.

Our 6-Step Home Addition Process

Every Greeley addition follows the same documented process. You know what's next, what it costs, and what milestone unlocks the next phase at every step.

1. On-site walkthrough & feasibility. We measure the house, review the lot for setbacks, easements, slope, septic location (if applicable), and existing utility capacity. We identify what's possible, what isn't, and where the natural place to attach the addition is.
2. Conceptual design & written scope. Layout drawings, footprint, roofline approach, foundation type, finish-level selections, and a written line-item estimate covering all phases. You see the full number before you commit.
3. Engineering, permits & zoning review. Structural engineer stamps the drawings. We submit to City of Greeley or Weld County for building permit. If you're on septic, we coordinate the Weld County Department of Environmental Health letter (1555 N 17 Ave, Greeley) before submittal. Zoning review confirms setbacks, lot coverage, height. This phase typically takes 6 to 12 weeks.
4. Foundation, framing & envelope. Footings poured to engineered spec, foundation walls or slab built, framing erected, roof tied in to the existing system, sheathing, house wrap, windows, doors, roofing, and siding installed to match. We pass framing inspection and dry-in inspection.
5. MEP, insulation, drywall & finishes. Electrical, plumbing, and HVAC are roughed in. Rough inspections passed. Insulation goes in to current Colorado energy code. Drywall is hung, taped, and finished. Paint, flooring, tile, cabinetry, trim, fixtures, and final electrical/plumbing finish.
6. Final inspection & walkthrough. All trades finish, punch-list is closed, final inspections (building, electrical, plumbing, mechanical) are passed, the certificate of occupancy or completion is issued, and the addition is yours.

Second-Story Additions in Greeley: What's Different

Second-story additions are the single most complex residential project in Northern Colorado, and the most rewarding when they go right. You're effectively building a small house on top of an existing house — which means the existing foundation, exterior walls, and load path have to be engineered to carry the new load.

The engineering questions we resolve first:

• Foundation capacity. Most pre-2000 Greeley homes have foundations sized for a one-story load. A structural engineer evaluates whether the existing footings need reinforcement or new helical piers.
• Bearing wall location. The new second-floor load has to land on the existing walls in the right places. Sometimes we add a steel beam or a new bearing wall on the main level to redirect load.
• Snow load & wind load. Colorado snow load for Greeley is significant. The new roof is engineered to current code, which often exceeds the spec the original 1980s or 1990s roof was built to.
• Stair location. A new stair to the second floor consumes 50 to 80 sq ft of existing main-floor area, which forces a partial main-floor remodel.
• Mechanical capacity. Your existing furnace, A/C, electrical panel, and water heater may need upgrades to handle the added square footage and bathrooms.
• You can't live in the house during framing. The roof comes off. Most homeowners relocate for 8 to 14 weeks during the open-roof phase. We schedule that window tight so it's as short as possible.

We line-item all of this in the estimate so there are no surprises during the open-roof phase — the most stressful four months of the project for any homeowner.

In-Law Suites & Attached ADUs in Greeley

Colorado's 2024 ADU law (HB 24-1152) requires local governments to allow at least one accessory dwelling unit per single-family lot in applicable residential zones, with administrative approval only. That means no public hearing, no neighbor objection process, no discretionary review. The specific path depends on your Greeley or Weld County zone district, lot size, and setback geometry — we handle the zoning research as part of the feasibility walkthrough.

Most Greeley homeowners build attached in-law suites for three reasons:

• Lower cost. An attached suite shares a wall, roof, and utilities with the main house. A fully detached ADU duplicates everything — foundation, roof, utility hookups, separate water/sewer service connection.
• Faster permit path. Attached suites usually go through standard building-permit review. Detached ADUs sometimes trigger additional land-use review depending on zone.
• Easier to convert back. If you stop needing the suite as a separate unit, the kitchen can be removed and the space becomes a master suite or extended family room.

A typical attached in-law suite in Greeley includes a bedroom, full bathroom, kitchenette (sink, cooktop, mini fridge, microwave), and a separate exterior entrance. Total cost typically $125,000 to $320,000 for 500 to 800 sq ft.

Permits, Zoning & Septic in Greeley & Weld County

Every home addition in Greeley city limits or unincorporated Weld County requires a building permit. The path depends on where the property sits:

• City of Greeley: permit submittal through the Community Development office. Zoning review against setbacks, lot coverage (typically max 40–50% depending on zone), and height limits. Plan review typically 4 to 8 weeks for additions.
• Unincorporated Weld County: permit submittal through Weld County Building Department. Zoning review through Planning & Development Services. Plan review typically 6 to 10 weeks.
• Septic system properties: the Weld County Department of Environmental Health (1555 N 17 Ave, Greeley) must confirm in writing that the existing or proposed septic system can handle the added bedrooms/bathrooms. No building permit is issued without this letter.
• Floodplain properties: additional land-use approval required, with elevation certificate.
• HOA neighborhoods: design review by the HOA architectural control committee, separate from city/county review and typically adding 2 to 6 weeks.

We own the entire permit and zoning relationship from feasibility through closed permit. You never deal with the building department, the planning department, or the health department directly — and the inspection coordination is on us, not on your calendar.

Why Greeley Homeowners Choose GIMA Renovation for Additions

We're a local Greeley team, family-owned, licensed, and insured. Every home addition we build includes:

• One contractor for design, engineering, foundation, framing, roof, siding, MEP, and finish — no handoff, no second estimate, no scheduling gap.
• Written, line-item scope before any work begins. Every trade, every fixture, every code adder on its own line.
• Foundation & concrete work in-house — footings, slabs, and stem walls are part of the team's core capability through our concrete crew, not a sub-contracted ask.
• Permits, zoning, septic & HOA design review handled for you — we own every government and HOA relationship from feasibility through closed permit.
• Colorado snow-load and high-altitude code knowledge baked in — the additions we build pass the first time, not the third.
• Clean, protected job sites — existing-home protection, daily cleanup, dust containment at the tie-in points, secured site at end of day.
• Damage-restoration capability built in — if a tie-in opens up hidden water, mold, or fire damage, we already mitigate in-house.
• Local Greeley phone number — the same project manager runs your addition from estimate to final inspection.

Service Area: Greeley & Northern Colorado

We design and build home additions throughout Greeley, Evans, Windsor, Fort Collins, Loveland, Johnstown, Severance, Eaton, Kersey, La Salle, and Milliken, plus surrounding Weld and Larimer County communities. If your home is in Northern Colorado, call (970) 836-4334 to schedule a free on-site walkthrough.

Frequently Asked Questions

How much does a home addition cost in Greeley, CO?

Ground-floor additions run $200–$320/sq ft; second-story $250–$500/sq ft. A 400 sq ft master suite: $90k–$180k. A full second story (1,000–1,500 sq ft): $250k–$500k+. Three-season sunroom: $15k–$45k. Four-season room: $30k–$100k. In-law suite / attached ADU: $125k–$320k. Colorado snow-load and high-altitude code adders typically run 10–20% on top of base cost.

How long does a home addition take in Greeley?

4 to 9 months total: 4–8 weeks of design and engineering, 6–12 weeks of permits and zoning review, and 12–28 weeks of construction depending on scope. Engineering and permit approval are the most common timeline factors, not construction itself.

What types of home additions do you build?

Room additions and bump-outs, master suite additions, second-story additions (full and partial), sunrooms (three-season and four-season), in-law suites and attached ADUs, kitchen and great-room expansions, and garage additions or conversions. We focus on attached additions.

Do I need a permit for a home addition in Greeley?

Yes. Building permit, zoning review, and (if applicable) Weld County Department of Environmental Health septic clearance are all required before construction. We handle every permit and inspection for you.

What's the difference between a three-season and four-season sunroom?

Three-season rooms use single/double-pane windows and no HVAC tie-in — usable April through October in Greeley, $15k–$45k. Four-season rooms are fully insulated, energy-code compliant, and conditioned via HVAC or mini-split — usable year-round, $30k–$100k.

Can I add an in-law suite or ADU to my Greeley home?

Almost always yes under Colorado HB 24-1152 (2024), which requires administrative-only ADU approval in applicable residential zones. Attached suites are the most cost-effective path: $125k–$320k for 500–800 sq ft.

Will the addition match the existing house?

That's the goal — we document existing siding profile, brick or stone, trim, roof pitch and shingle color on the walkthrough, then either match the original product or specify a deliberate transition (column, recess, contrasting band) where a seamless match isn't possible.

Ready to Plan Your Greeley Home Addition?

Call (970) 836-4334 to schedule a free on-site walkthrough, or send a message through our contact page with a few photos of your house and a description of what you're picturing. We'll review setbacks, septic, and zoning, walk the site, and send a written, line-item estimate within a few business days — no pressure, no obligation.