Accessory Dwelling Unit (ADU) Construction in Baltimore, MD — Costs $82,430 to $480,842
What does accessory dwelling unit (adu) construction cost in Baltimore? Average $206,075, ranging $82,430–$480,842. Labor runs $44.03/hr locally — 37% above the national average. Free breakdown with material + labor split.
Baltimore, MD Market
+37% vs nationalLabor Rate
$44.03/hr
Material Index
128
Avg Permit Cost
$2,405
Median Home Price
$462,921
As one of the largest metros in Maryland, Baltimore has a competitive contractor market with hundreds of licensed professionals. This typically gives homeowners more leverage on pricing, though high demand for renovations can offset that advantage. At 37% above the national average, Baltimore is one of the more expensive markets for home improvement — driven primarily by above-average labor rates in the region. The median home in Baltimore is valued at $462,921, putting this project at about 44.5% of home value — a moderate investment with a projected 80% ROI.
Low Estimate
$82,430
National: $60,000
Mid-Range
$206,075
National: $150,000
High End
$480,842
National: $350,000
Per Sq Ft
$343
National: $250
Accessory Dwelling Unit (ADU) Construction Cost Calculator for Baltimore
Adjusted for Baltimore's labor rate ($44.03/hr) and material costs (index 128).
Mid-grade materials, good quality fixtures, standard options.
Estimated Total in Baltimore
$206,075
Based on 200 sq ft at mid quality, adjusted for Baltimore market rates.
Local Cost Breakdown
At Baltimore's average rate of $44.03/hr (47% above national avg)
Material cost index 128 (28% above national baseline of 100)
Accessory Dwelling Unit (ADU) Construction vs. Home Value in Baltimore
| Metric | Baltimore | National Avg |
|---|---|---|
| Accessory Dwelling Unit (ADU) Construction (Mid-Range) | $206,075 | $150,000 |
| Median Home Price | $462,921 | $350,000 |
| Project as % of Home Value | 44.5% | 42.9% |
| Estimated ROI | 80% | 80% |
| Median Household Income | $82,298 | $75,000 |
What Affects the Price in Baltimore
- 1Local labor rates ($44.03/hr in Baltimore)
- 2Material cost index (128 vs national 100)
- 3Attached vs detached
- 4Size and bedroom count
- 5Kitchen and bath quality
- 6Local ADU regulations
Popular Upgrades
- Full kitchen
- Separate entrance
- Solar panels for energy independence
Other Projects in Baltimore, MD
Second Story Addition
$274,767
Room Addition
$123,645
Swimming Pool Installation
$88,079
Garage Addition
$75,561
Home Addition
$109,156
Inground Swimming Pool
$87,469
Attic Conversion
$76,077
Swimming Pool Construction
$69,161
Accessory Dwelling Unit (ADU) Construction in Other Maryland Cities
Planning a Accessory Dwelling Unit (ADU) Construction in Baltimore
Building permits are typically required for a accessory dwelling unit (adu) construction in Baltimore. The average permit fee in this area is $2,405, though costs vary based on project scope. Permit fees in this market are above average — factor them into your total budget. Plan for 6-18 months from start to finish.
A accessory dwelling unit (adu) construction is a complex project best left to licensed professionals. In Baltimore, skilled contractors charge an average of $44.03/hr, and the specialized nature of this work means cutting corners on labor can lead to costly rework.
With a median household income of $82,298, many Baltimore residents can budget for this project through savings. The mid-range cost of $206,075 represents 250% of the typical household's annual income.
Accessory Dwelling Unit (ADU) Construction — National Guide
See the full national cost guide with DIY tips, cost factors, and ROI analysis.
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