Home addition cost in Maryland
Statewide estimate from BLS wages and BEA prices. Reviewed Nov 4, 2026.
- Statewide range (300 sq ft)
- $39,100 – $79,300
- Per sq ft
- $129 – $257
- before permit
- Versus US midpoint
- +3%
- US $57,500
- Metros covered
- 3
What does it cost to build a home addition in Maryland? Plan on $39,100 to $79,300 for 300 sq ft. Wages (1.03x the US blend), materials (price index 102.5) and permit costs (105.0) put the state above the national midpoint by 3%.
Inside Maryland, the metros we cover range from $54,400 (Hagerstown) to $57,700 (Baltimore) at the midpoint. Pick your closest city in the table for a tighter number.
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Estimated cost for 300 sq ft in Maryland (statewide), standard level
$51,200 to $67,200
About $167 to $219 per sq ft before permits. Labor is about 67% of the bill.
| Part | Low | High |
|---|---|---|
| Materials | $16,000 | $20,900 |
| Labor | $34,200 | $44,700 |
| Permits and fees | $1,000 | $1,650 |
| Total | $51,200 | $67,200 |
Cost breakdown for 300 sq ft in Maryland
| Part of the job | Low | Midpoint | High | Share |
|---|---|---|---|---|
| Materials | $12,300 | $18,500 | $24,600 | 31% |
| Labor | $26,300 | $39,400 | $52,600 | 67% |
| Permits and fees | $520 | $1,300 | $2,100 | 2% |
| Total | $39,100 | $59,200 | $79,300 | 100% |
Basic, standard or premium: Maryland prices
Bands overlap on purpose, since a good standard job can cost as much as a light premium one. Below are the three bands for the default size, then a grid from bump-out (100 sq ft) to large suite (600 sq ft).
Basic
$39,100 to $55,200
Bump-out or simple room without plumbing
Standard
$51,200 to $67,200
Standard room addition with HVAC and electrical
Premium
$63,200 to $79,300
Large addition with bath or kitchen and a new foundation
| Size | Basic | Standard | Premium |
|---|---|---|---|
| bump-out (100 sq ft) | $13,400 – $19,200 | $17,700 – $23,500 | $22,100 – $27,800 |
| 20x20 room (400 sq ft) | $52,000 – $73,200 | $67,900 – $89,100 | $83,800 – $105,000 |
| large suite (600 sq ft) | $77,700 – $109,000 | $101,500 – $133,000 | $125,000 – $156,500 |
Wages behind the Maryland number
Maryland's labor line is priced from 6 trades, each compared with its US median wage. After weighting by each trade's share of the work, the state comes out at 1.03 times the national level.
Carpenters (47-2031), 50% of the weighting: a median of $30.27 an hour, 4% above the US median of $29.12. The middle half of them earn between $25.11 and $36.93 an hour. About 9,770 work in the state. That is 35.4 per 10,000 jobs, compared with 43.1 nationally, so expect fewer local crews to bid.
Cement masons and concrete finishers (47-2051), 10% of the weighting: a median of $24.98 an hour, 9% below the US median of $27.41. The middle half of them earn between $22.75 and $28.44 an hour. About 2,540 work in the state. That is 9.2 per 10,000 jobs, compared with 13.3 nationally, so expect fewer local crews to bid.
For electricians (47-2111, weighted 10%) the local median is $35.33 an hour, which is 16% above the national $30.38. The middle half of them earn between $27.73 and $46.16 an hour. BLS counts 13,690 of them working in the state, 49.5 for every 10,000 jobs (US: 48.7), so the local bench is about average.
Plumbers, pipefitters and steamfitters (47-2152), 10% of the weighting: a median of $31.44 an hour, in line with the US median of $30.67. The middle half of them earn between $26.34 and $45.62 an hour. About 11,420 work in the state. That is 41.3 per 10,000 jobs, compared with 30.0 nationally, which suggests plenty of local crews to bid.
For drywall and ceiling tile installers (47-2081, weighted 10%) the local median is $26.29 an hour, which is 7% below the national $28.33. The middle half of them earn between $22.96 and $29.22 an hour. BLS counts 1,470 of them working in the state, 5.3 for every 10,000 jobs (US: 5.3), so the local bench is about average.
Roofers (47-2181), 10% of the weighting: a median of $28.89 an hour, 8% above the US median of $26.65. The middle half of them earn between $23.20 and $36.08 an hour. About 2,050 work in the state. That is 7.4 per 10,000 jobs, compared with 8.7 nationally, so the supply of crews looks typical.
A crew paid at the 75th percentile for carpenters ($36.93 an hour) would add about $4,350 to the statewide midpoint; one at the 25th percentile ($25.11) would take off about $3,400. Use that as a rough guide to how far a bid can sit from our midpoint on wages alone.
BLS counts 2,763,030 jobs across Maryland (May 2025), which is 1.8% of US employment.
| Trade | Weight | 25th pct | Median | 75th pct | US median | Ratio | Level used |
|---|---|---|---|---|---|---|---|
| Carpenters (47-2031) | 50% | $25.11 | $30.27 | $36.93 | $29.12 | 1.04 | state |
| Cement masons and concrete finishers (47-2051) | 10% | $22.75 | $24.98 | $28.44 | $27.41 | 0.91 | state |
| Electricians (47-2111) | 10% | $27.73 | $35.33 | $46.16 | $30.38 | 1.16 | state |
| Plumbers, pipefitters and steamfitters (47-2152) | 10% | $26.34 | $31.44 | $45.62 | $30.67 | 1.03 | state |
| Drywall and ceiling tile installers (47-2081) | 10% | $22.96 | $26.29 | $29.22 | $28.33 | 0.93 | state |
| Roofers (47-2181) | 10% | $23.20 | $28.89 | $36.08 | $26.65 | 1.08 | state |
| Blended | 100% | 1.03 | |||||
Related projects, priced for Maryland
Each project weights the trades differently, so Maryland's wage level does not push every price by the same amount. Compared with the US midpoint, roof replacement is +5% and bathroom remodel level.
| Project | Size | Range | vs. US |
|---|---|---|---|
| Kitchen remodel | 120 sq ft | $19,000 – $32,300 | +3% |
| Bathroom remodel | 45 sq ft | $4,700 – $23,300 | level |
| Detached garage | 576 sq ft | $29,700 – $59,700 | +3% |
| Roof replacement | 2,000 sq ft of roof | $6,450 – $13,100 | +5% |
Why two Maryland quotes can differ
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.
Permits
Construction permits run $500-$2,000, or $5-$21 per $1,000 of project cost (HomeGuide).
Foundation
A foundation, framing, roofing and matching exterior finishes all have to be built before the interior work starts.
When Maryland weather lets you build
Weather decides when digging and ground work can happen, and Maryland is not uniform. The table uses NOAA's 1991-2020 climate normals from the weather station nearest each metro we cover, and counts the months that are neither cold nor hot enough to complicate the job.
Lexington Park has the longest comfortable season of the metros we cover in Maryland at 10 months (March through December); Hagerstown has the shortest at 8 (April through November). Rainfall runs from 44 inches a year in Hagerstown to 45 inches in Lexington Park.
We do not adjust prices by month, because we have no reliable published data on seasonal pricing. Timing is still worth raising when you collect bids.
| Metro | Jan avg low °F | Jul avg high °F | Precip (in/yr) | Comfortable months |
|---|---|---|---|---|
| Baltimore | 30 | 90 | 44 | 9: March through June and August through December |
| Hagerstown | 22 | 86 | 44 | 8: April through November |
| Lexington Park | 30 | 87 | 45 | 10: March through December |
How Maryland compares with nearby states
Maryland ranks 15 of 51 (the 50 states plus DC) for home addition, where 1 is the most expensive. The costliest is Hawaii at $76,300 and the cheapest Arkansas at $48,200, both for 300 sq ft at the midpoint. Maryland sits at $59,200. The five states closest by workforce center are listed below.
| State | Distance | Range | Midpoint | vs. here |
|---|---|---|---|---|
| District of Columbia | 50 miles away | $41,700 – $84,500 | $63,100 | +7% |
| Delaware | 60 miles away | $37,100 – $75,200 | $56,200 | −5% |
| Pennsylvania | 70 miles away | $38,300 – $77,600 | $58,000 | −2% |
| New Jersey | 110 miles away | $42,600 – $86,300 | $64,500 | +9% |
| Virginia | 150 miles away | $36,100 – $73,300 | $54,700 | −8% |
Maryland metro-by-metro prices
0 of the 3 metros sit above the statewide midpoint of $59,200, and the top-to-bottom gap is 6%. Each row prices the default size with that metro's own BLS wages and BEA price levels, so the gap between rows is real local variation rather than a flat markup.
| Metro | Range (300 sq ft) | Midpoint | vs. state |
|---|---|---|---|
| Baltimore, MD | $38,100 – $77,300 | $57,700 | −2% |
| Lexington Park, MD | $37,900 – $76,900 | $57,400 | −3% |
| Hagerstown, MD | $35,900 – $72,800 | $54,400 | −8% |
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Detailed home addition report for Maryland, $9
Multi-page report for Maryland: low, typical and high cost, a line-item breakdown of materials and labor by trade, permit notes, the best months to schedule, a quote comparison sheet, red flags, questions for contractors, checklists and every source. Save your estimate above, preview page 1 free, and unlock the full report for $9 one-time, or get every report with CostLocal Pro.
Home addition in Maryland: your questions
+How much does it cost to build a home addition in Maryland?
$39,100 to $79,300 for 300 sq ft, using statewide wages and prices. Metro areas inside Maryland can sit above or below that.
+Which city in Maryland is cheapest for home addition?
Hagerstown at about $54,400 (midpoint, 300 sq ft). The priciest is Baltimore at $57,700.
+Is home addition cheaper in Maryland than the US average?
It is 3% more expensive: $59,200 against $57,500 for 300 sq ft at the midpoint.
+What share of the price is labor in Maryland?
About 67% ($39,400). Materials are 31%. Statewide labor for this job is weighted 1.03x the national wage level.
+What do carpenters earn in Maryland?
The BLS statewide median is $30.27 an hour, against $29.12 for the US. The 25th to 75th percentile range is $25.11 to $36.93.
+Where does Maryland rank for home addition costs?
15th most expensive of 51 (the 50 states plus DC) at the midpoint, $59,200 for 300 sq ft. Rank 1 is the costliest.
+What do basic and premium home addition work cost in Maryland?
For 300 sq ft, basic work runs $39,100 to $55,200 and premium work $63,200 to $79,300. Basic means: bump-out or simple room without plumbing. Premium means: large addition with bath or kitchen and a new foundation.
+Does the season matter for home addition in Maryland?
Yes where winters or summers are hard. Of the Maryland metros we cover, Lexington Park has the most comfortable months (10 of 12) based on NOAA 1991-2020 normals. Our prices do not change by month, so ask contractors whether they charge more or less in busy and slow seasons.
Home addition by city in Maryland
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.