Home Addition cost in Davenport, IA
Davenport, IA · updated August 2026
$94,600
Typical local cost
$40,500 – $252,300
Typical range
- per sq ft of added space
- $150 – $400
- Permit
- Yes
- Typical timeline
- 3-6 months of construction
Installed, local pricing
$655 – $4,920 in fees
3-6 months of construction, 6-14 months including design and permitting
Davenport runs -10% against the U.S. average · data confidence Medium · modeled estimate, not a quote
The modeled midpoint for Davenport is $94,600. The local adjustment for this trade is x0.901 — driven mainly by Scott County labor rates and 90% exposure to local code requirements.
Estimate your Davenport job
Priced with this market's cost index, so the calculator, the size table and the ranges on this page all agree.
Square footage
180 sq ft
- With waste allowance
- 198 sq ft
- Square yards
- 20
- Perimeter (per area)
- 54 ft
- Square meters
- 16.72
Priced for Davenport (local adjustment x0.901).
Estimates only. Local pricing, site conditions and code requirements change the real number.
Cost by project size
Generated from the same unit pricing the calculator uses.
| Project size | Estimated range |
|---|---|
| 200 sq ft of added space | $30,000 – $80,000 |
| 275 sq ft of added space | $41,300 – $110,000 |
| 325 sq ft of added space | $48,800 – $130,000 |
| 425 sq ft of added space | $63,800 – $170,000 |
| 575 sq ft of added space | $86,300 – $230,000 |
Based on Davenport pricing of $150–$400 per sq ft of added space.
Where the money goes
- Labor
- $52,000
- 53% of median
- Materials
- $42,600
- 44% of median
- Permit & fees
- $2,790
- 3% of median
Davenport project costs-10% vs U.S. average
Based on Scott County labor rates, local material logistics and permit-fee posture for this trade.
What the project looks like start to finish
Typical sequence for this scope. Timing varies with contractor backlog and plan-review queues.
01
Planning & quotes
Scope, material choice, contractor selection
02
Permit application
Filed with City of Davenport building department
03
Materials & staging
Order lead time on non-stock materials
04
Installation
3-6 months of construction, 6-14 months including design and permitting
05
Inspection
Foundation / slab inspection, Framing and sheathing, Electrical, plumbing and mechanical rough, Insulation and energy, Final building inspection
06
Closeout
Final sign-off, warranty and documentation
Davenport labor intelligence
What the trade charges here, and how much of your price it is.
Loaded hourly rate
$63–$81
Structural crews in Scott County · -13% vs U.S. ($82/hr)
Typical crew
4 × 23 days
On-site time for a typical addition job here.
Labor in the price
$52,000
55% of the median — the rest is material, disposal and permit.
Because labor is 55% of this job, Davenport wage levels move the price far more than material prices do. A quote well under this labor figure usually means a smaller crew, a longer schedule, or unlicensed help.
Basis: Hometriva labor model: national structural crew rates adjusted by the Scott County labor factor (x0.870). · BLS Occupational Employment and Wage Statistics, Hometriva methodology
Why Davenport differs from the national average
The local delta, broken into dollars by driver.
Trade labor rates-$7,500
Scott County crews price 13% below the national average, and labor is 55% of this job.
Material and delivery-$1,900
Materials are nationally traded, so they move less — but delivery into this market runs 4% under baseline.
Code and inspection load-$1,050
Home Addition carries 90% exposure to local code requirements, and this jurisdiction's review load indexes at x0.99.
Permit fees-$600
Fees are paid to the jurisdiction, not the contractor, and are budgeted separately from the contract price.
Basis: Decomposition of the modeled Davenport median against the U.S. median for this scope. · City of Davenport building department, Hometriva methodology
Davenport vs Iowa vs the U.S.
Change the inputs, see your number
The same local model, run against your job instead of the average one.
Simulated home addition in Davenport
$97,390
Likely range $43,290 – $255,090
Simulated from the same local model as the numbers above — it changes the inputs, not the pricing method.
What makes the number move
- Added square footage and whether it is one or two stories
- Foundation type and site conditions
- Extending or adding HVAC capacity
- Zoning setbacks, lot coverage and impact fees
- Flood zone elevation requirements
Who issues each permit
Tracked per discipline — the building permit issuer is not always the body that reviews electrical, plumbing, zoning or fire.
| Discipline | Issuing authority |
|---|---|
| building | City of Davenport building departmentModeled estimate |
| electrical | City of Davenport building departmentModeled estimate |
| mechanical | City of Davenport building departmentModeled estimate |
| plumbing | City of Davenport building departmentModeled estimate |
| zoning | City of Davenport building departmentModeled estimate |
| fire | City of Davenport building departmentModeled estimate |
Permit requirement in Davenport
Yes — a permit is required for home addition in Davenport, IA. The work must be inspected before it can be closed out, and a licensed contractor generally has to pull the permit.
- Permitting authority
- City of Davenport building departmentModeled estimate
- Permit fee
- Estimated allowance $655–$4,920Modeled from comparable fee schedules — not an official quoted fee.
Inspections
- Foundation / slab inspection
- Framing and sheathing
- Electrical, plumbing and mechanical rough
- Insulation and energy
- Final building inspection
Local conditions that change this job
Only the exposures that materially affect home addition.
Design wind speed exposure
High70/100
Named-storm exposure
High70/100
Flood zone exposure
Moderate50/100
Owner-occupied homes
0%
Owner-occupied share of the housing stock, which drives how much of this work is homeowner-funded versus landlord-funded.
Households in market
40,142
Approximate household count in Davenport, used to size the contractor pool for this trade.
Permit activity index
x0.82
Relative permit volume and fee load versus the national baseline.
Nearby market comparison
| Market | Local factor | Median | Per sq ft of added space |
|---|---|---|---|
| Davenport (this page) | x0.901 | $94,600 | $150 – $400 |
| Iowa City | x0.901 | $94,600 | $150 – $400 |
| Cedar Rapids | x0.901 | $94,600 | $150 – $400 |
| Peoria | x1.164 | $122,200 | $200 – $500 |
What Davenport homeowners actually paid
Homeowner-reported invoices for this market. Nothing is published until enough reports clear review, so this section is often empty in newer markets — adding yours takes 20 seconds and no personal details.
Quotes homeowners were given in Davenport
Quotes run ahead of final invoices. Reporting yours shows the local spread and where there is room to negotiate.
How Hometriva estimates Davenport addition costs
Hometriva does not publish invented city prices. The Davenport estimate for home addition is produced by this chain, and every input is stored separately:
- National baseline$105,000
Typical U.S. cost for home addition on a single-family home.
- Local labor factorx0.870
Davenport-area trade labor rates, weighted at 55% of this job.
- Material factorx0.960
Material and delivery pricing into Scott County, weighted at 45%.
- Regulatory factorx0.989
Local code, product-approval and inspection load, applied at 90% for this project type.
- Applied multiplierx0.901
Blended Davenport adjustment specific to home addition.
- Permit component$655 – $4,920
Budgeted separately from the contract price because it is paid to the jurisdiction.
Because labor, material and regulatory factors are weighted per project, home addition in Davenport carries a different local adjustment than other trades in the same market.
Reviewed by
Hometriva Cost Data Desk
Maintains the unit-cost baselines, local adjustment factors and material pricing. Reviewed for home addition pricing in Davenport, IA.
- • National unit-cost baselines against current trade pricing
- • Local labor and materials factors for the market
- • Material installed-cost ranges and service life
Last reviewed August 2026 · Editorial standards · Report an error
Frequently asked questions
Do I need a permit for home addition in Davenport, IA?
In most jurisdictions this work is permitted and inspected. Requirements are set locally, so confirm the current application and inspection checklist with your building department before work starts.
How long does home addition take?
3-6 months of construction, 6-14 months including design and permitting. Permit review and inspection scheduling are usually the largest source of variation.
What changes the price the most?
The largest cost drivers are added square footage and whether it is one or two stories; foundation type and site conditions; extending or adding hvac capacity.
Sources
Sources & verification
Model vintage August 2026. The links above are the issuing agencies' own pages — we publish them so you can confirm the current rule yourself, not as evidence that each fact on this page was re-checked with them today. Cost figures are modeled estimates based on national baselines adjusted for local labor and material pricing, not quotes. Permit rules change; confirm with the building department before starting work.