Home addition cost in Baltimore, MD
Local estimate from BLS wage data and BEA price levels. Reviewed Nov 4, 2026.
- Typical range (300 sq ft)
- $38,100 – $77,300
- Per sq ft
- $125 – $251
- before permit
- Versus US midpoint
- Level
- US $57,500
- Rank of 300 metros
- #114
- 1 = most expensive
Baltimore homeowners pay roughly $38,100 to $77,300 to build a home addition at 300 sq ft, or $125 to $251 per sq ft (permit not included). Against the US midpoint, Baltimore is almost level. Building materials run about 2% above the US average here (BEA goods price index 102.4).
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Estimated cost for 300 sq ft in Baltimore, MD, standard level
$49,900 to $65,600
About $163 to $213 per sq ft before permits. Labor is about 66% of the bill.
| Part | Low | High |
|---|---|---|
| Materials | $16,000 | $20,900 |
| Labor | $32,900 | $43,100 |
| Permits and fees | $990 | $1,600 |
| Total | $49,900 | $65,600 |
Cost breakdown for 300 sq ft in Baltimore, MD
| Part of the job | Low | Midpoint | High | Share |
|---|---|---|---|---|
| Materials | $12,300 | $18,400 | $24,600 | 32% |
| Labor | $25,300 | $38,000 | $50,700 | 66% |
| Permits and fees | $520 | $1,300 | $2,100 | 2% |
| Total | $38,100 | $57,700 | $77,300 | 100% |
Where the Baltimore price comes from
We price the labor side from BLS wage data for 6 trades: carpenters at 50%, cement masons and concrete finishers at 10%, electricians at 10%, plumbers, pipefitters and steamfitters at 10%, drywall and ceiling tile installers at 10%, roofers at 10%. Weighted together, Baltimore wages are 0.99 times the national level. Labor makes up about 66% of the midpoint estimate (67% at national prices).
On the materials line, the BEA goods price index for the Baltimore metro is 102.4 (US = 100). The midpoint materials bill for 300 sq ft comes to $18,400, compared with $18,000 at national prices. Permit and inspection fees are scaled by the broader index (104.5) and land at $520 to $2,100.
Local wages behind the labor line
Wages are the part of this estimate that changes most from town to town. 6 trades carry the job here, and each is compared with its US median. The weighted result for Baltimore is 0.99 times the national level.
For carpenters (47-2031, weighted 50%) the local median is $29.99 an hour, which is in line with the national $29.12. The middle half of them earn between $24.96 and $36.06 an hour. BLS counts 3,870 of them working in the area, 28.5 for every 10,000 jobs (US: 43.1), so the local bench is thinner than average.
For cement masons and concrete finishers (47-2051, weighted 10%) the local median is $24.98 an hour, which is 9% below the national $27.41. The middle half of them earn between $22.75 and $28.44 an hour. BLS counts 1,390 of them working in the area, 10.2 for every 10,000 jobs (US: 13.3), so the local bench is thinner than average.
Electricians (47-2111), 10% of the weighting: a median of $31.54 an hour, 4% above the US median of $30.38. The middle half of them earn between $26.96 and $44.20 an hour. About 6,930 work in the metro. That is 51.1 per 10,000 jobs, compared with 48.7 nationally, so the supply of crews looks typical.
For plumbers, pipefitters and steamfitters (47-2152, weighted 10%) the local median is $30.38 an hour, which is in line with the national $30.67. The middle half of them earn between $26.38 and $39.76 an hour. BLS counts 5,220 of them working in the area, 38.5 for every 10,000 jobs (US: 30.0), so the local bench is deeper than average.
Drywall and ceiling tile installers (47-2081), 10% of the weighting: a median of $23.41 an hour, 17% below the US median of $28.33. The middle half of them earn between $19.01 and $27.58 an hour. About 470 work in the metro. That is 3.5 per 10,000 jobs, compared with 5.3 nationally, so expect fewer local crews to bid.
For roofers (47-2181, weighted 10%) the local median is $27.11 an hour, which is in line with the national $26.65. The middle half of them earn between $22.79 and $32.98 an hour. BLS counts 890 of them working in the area, 6.6 for every 10,000 jobs (US: 8.7), so the local bench is thinner than average.
Quotes come from real crews, not medians. If the carpenters on your job are paid at the 75th percentile ($36.06 an hour) instead of the median, the labor line grows by about $4,000. At the 25th percentile ($24.96) it shrinks by about $3,300. The total moves by 6.9% or 5.7%, so wages alone rarely explain a quote that is far outside our range.
For context on the local economy, BLS counts 1,356,680 jobs in the Baltimore-Columbia-Towson area. That makes it the 22nd largest of the 300 metros we cover, with 0.87% of US employment.
| Trade | Weight | 25th pct | Median | 75th pct | US median | Ratio | Level used |
|---|---|---|---|---|---|---|---|
| Carpenters (47-2031) | 50% | $24.96 | $29.99 | $36.06 | $29.12 | 1.03 | metro |
| Cement masons and concrete finishers (47-2051) | 10% | $22.75 | $24.98 | $28.44 | $27.41 | 0.91 | metro |
| Electricians (47-2111) | 10% | $26.96 | $31.54 | $44.20 | $30.38 | 1.04 | metro |
| Plumbers, pipefitters and steamfitters (47-2152) | 10% | $26.38 | $30.38 | $39.76 | $30.67 | 0.99 | metro |
| Drywall and ceiling tile installers (47-2081) | 10% | $19.01 | $23.41 | $27.58 | $28.33 | 0.83 | metro |
| Roofers (47-2181) | 10% | $22.79 | $27.11 | $32.98 | $26.65 | 1.02 | metro |
| Blended | 100% | 0.99 | |||||
How Baltimore compares
Of the five closest metros, 3 are cheaper than Baltimore. Dover is the lowest at about $52,600 (midpoint, 300 sq ft), 60 miles away.
| Area | Range | Midpoint | vs. here |
|---|---|---|---|
| Baltimore, MDthis page | $38,100 – $77,300 | $57,700 | |
| York, PA45 miles | $38,700 – $78,300 | $58,500 | +1% |
| Lancaster, PA55 miles | $37,000 – $75,100 | $56,100 | −3% |
| Dover, DE60 miles | $34,700 – $70,400 | $52,600 | −9% |
| Washington, DC60 miles | $39,700 – $80,500 | $60,100 | +4% |
| Lexington Park, MD70 miles | $37,900 – $76,900 | $57,400 | −1% |
| Maryland (statewide) | $39,100 – $79,300 | $59,200 | +3% |
| United States | $38,000 – $77,000 | $57,500 | level |
Across 300 US metros, Baltimore comes in at #114 from the top. The priciest is Honolulu, HI at $79,600; the cheapest is Brownsville, TX at $44,300 (midpoints, 300 sq ft). Statewide, Baltimore is 2% below the Maryland figure.
Other Maryland metros
| Metro | Size | Range | Midpoint | vs. here |
|---|---|---|---|---|
| Hagerstown, MD | 107,170 jobs | $35,900 – $72,800 | $54,400 | −6% |
| Lexington Park, MD | 70,650 jobs | $37,900 – $76,900 | $57,400 | −1% |
Cities with a workforce like Baltimore's
Big cities and small ones price differently, so here is Baltimore against the 4 metros with the closest total employment.
| Metro | Size | Range | Midpoint | vs. here |
|---|---|---|---|---|
| Charlotte, NC | 1,358,370 jobs | $33,900 – $68,800 | $51,300 | −11% |
| St. Louis, MO | 1,341,320 jobs | $41,800 – $84,600 | $63,200 | +9% |
| Orlando, FL | 1,411,730 jobs | $33,200 – $67,400 | $50,300 | −13% |
| Austin, TX | 1,293,690 jobs | $33,800 – $68,700 | $51,300 | −11% |
Specs and site conditions that change a Baltimore bid
Foundation
A foundation, framing, roofing and matching exterior finishes all have to be built before the interior work starts.
Type of addition
A new room is $125-$250 per sq ft; a bump-out $85-$200; an attic conversion $50-$150; a garage conversion $50-$200 (HomeGuide).
Plumbing and fixtures
Adding a bathroom or kitchen drives the price up the most.
Pick a size, pick a tier: home addition pricing in Baltimore
Three bands are cut from the same cited range and localized for Baltimore wages and prices. They overlap on purpose: a good standard job and a modest premium job can cost the same. The grid below prices the same bands at 3 common sizes.
Basic
$38,100 to $53,800
Bump-out or simple room without plumbing
Standard
$49,900 to $65,600
Standard room addition with HVAC and electrical
Premium
$61,600 to $77,300
Large addition with bath or kitchen and a new foundation
| Size | Basic | Standard | Premium |
|---|---|---|---|
| bump-out (100 sq ft) | $13,100 – $18,700 | $17,300 – $22,900 | $21,500 – $27,200 |
| 20x20 room (400 sq ft) | $50,700 – $71,400 | $66,200 – $86,900 | $81,700 – $102,500 |
| large suite (600 sq ft) | $75,700 – $106,500 | $98,800 – $129,500 | $122,000 – $152,500 |
Related projects, priced for Baltimore
Because every project leans on different trades, Baltimore's wage level does not move all prices equally. Against the US midpoint, roof replacement runs +2% and bathroom remodel −2%.
| Project | Size | Range | vs. US |
|---|---|---|---|
| Kitchen remodel | 120 sq ft | $18,800 – $32,000 | +2% |
| Bathroom remodel | 45 sq ft | $4,600 – $22,900 | −2% |
| Detached garage | 576 sq ft | $29,300 – $58,900 | +1% |
| Roof replacement | 2,000 sq ft of roof | $6,200 – $12,700 | +2% |
When to schedule home addition in Baltimore
We use NOAA's 1991-2020 climate normals for Md Sci Ctr Baltimore (in the city). These are 30-year monthly averages, not forecasts.
March through June and August through December are the stretches where digging, grading and setting material in the ground runs into the fewest weather problems in Baltimore (9 of 12 months). January and February have an average overnight low at or below freezing (32°F); July has an average daytime high of 90°F or more.
In January and February the average low is at or below freezing, which means frozen ground and slower digging, compaction and sod or stone placement. NOAA counts about 52 days a year with a low at or below 32°F at this station.
Baltimore gets about 44 inches of precipitation in a normal year. The wettest months are July, August and September (4.7 inches in July). Inside the workable window, June and November are the driest, at 3.4 and 3.0 inches. The station averages about 43 days a year at 90°F or above.
Does the season change the price? Probably, but we do not have a sourced seasonal price curve, so the estimator shows a year-round figure and does not adjust by month. When you collect quotes, ask whether scheduling in a slower month gets a better rate.
| Month | Avg high °F | Avg low °F | Precip (in) | For this job |
|---|---|---|---|---|
| Jan | 44 | 30 | 3.1 | Cold |
| Feb | 47 | 32 | 2.8 | Cold |
| Mar | 55 | 39 | 3.9 | Workable |
| Apr | 67 | 48 | 3.5 | Workable |
| May | 76 | 58 | 3.4 | Workable |
| Jun | 85 | 68 | 3.4 | Workable |
| Jul | 90 | 73 | 4.7 | Hot |
| Aug | 87 | 71 | 4.3 | Workable |
| Sep | 80 | 65 | 4.5 | Workable |
| Oct | 69 | 53 | 3.5 | Workable |
| Nov | 58 | 43 | 3.0 | Workable |
| Dec | 48 | 35 | 3.7 | Workable |
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Home addition in Baltimore: your questions
+How much does it cost to build a home addition in Baltimore?
For 300 sq ft, expect $38,100 to $77,300 in the Baltimore area. A standard-spec job lands at $49,900 to $65,600. Small jobs usually cost more per sq ft and large ones less.
+What is the price per sq ft for home addition in Baltimore?
About $125 to $251 per sq ft for materials and labor, plus $520 to $2,100 for the permit if one is needed. The US range is $125 to $250.
+Is home addition cheaper in Baltimore or York?
York is 45 miles away. The midpoint for 300 sq ft there is $58,500, which is 1% more than Baltimore ($57,700). Wage and materials indexes both feed that gap.
+How much of the bill is labor in Baltimore?
About 66% at the midpoint, or $38,000 out of $57,700. Materials are 32% and permits 2%. Nationally, labor is 67%.
+What would 20x20 room (400 sq ft) cost in Baltimore?
$50,700 to $102,500. Pick a different size in the estimator above to get your own number.
+Does home addition need a permit in Baltimore?
Often, but rules are set by your city or county building office, so call before you hire. Budget $520 to $2,100 for fees in the Baltimore area (our national range of $500 to $2,000 scaled by the local price level).
+Is Baltimore expensive for home addition compared with the rest of Maryland?
Baltimore is 2% below the Maryland statewide estimate ($59,200 at the midpoint). We cover 3 metros in Maryland; see the state page to compare them.
+What do carpenters earn in Baltimore?
The BLS median is $29.99 an hour in the Baltimore area, compared with $29.12 nationally. The 25th to 75th percentile range is $24.96 to $36.06.
+What do basic and premium home addition work cost in Baltimore?
For 300 sq ft, basic work runs $38,100 to $53,800 and premium work $61,600 to $77,300. Basic means: bump-out or simple room without plumbing. Premium means: large addition with bath or kitchen and a new foundation.
+When is the best time to build a home addition in Baltimore?
Based on NOAA 1991-2020 normals, the comfortable months for this kind of work are March through June and August through December. June and November are typically the driest of those months. Local contractors' schedules matter as much as the weather, so book early for the busy months.
Home addition near Baltimore
Where these numbers come from
Base prices are national ranges from the sources below. We scale labor by local BLS wages, materials by BEA goods prices and permits by the BEA all-items price level. Full method on the methodology page.
- HomeGuide: How Much Does a Home Addition Cost? (2026) (accessed November 4, 2026)
- Cost to Renovate: Renovation Labor Report 2026: Where the Money Goes (accessed November 4, 2026)
- HomeGuide: 2026 Building Permit Costs | Fees & Cost Calculator (accessed November 4, 2026)
- BLS Occupational Employment and Wage Statistics, May 2025
- BEA Regional Price Parities, 2024
- NOAA NCEI U.S. Climate Normals, 1991-2020
Note on derived figures: Materials = 32% of the installed price, from Cost to Renovate's mid-range 'Structural' category split (56% labor, 32% materials, 11% permits and design). It is a category average rather than an addition-specific figure.