How much does a second story addition cost in Boston, MA?

The average second story addition in Boston, MA costs $322,700 in 2026. Costs range from $129,080 for a basic project to $806,750 for a high-end renovation. Boston is 61% more expensive than the national average of $200,000.

What is the labor rate for contractors in Boston?

The average contractor labor rate in Boston, MA is $53.91/hour, compared to the national average of $30/hour. For a second story addition, labor typically accounts for 50% of the total cost, which is approximately $161,350 in Boston.

Are materials more expensive in Boston?

Boston has a material cost index of 143 (national average = 100). Materials cost about 43% more than the national average. For a second story addition, materials account for 50% of the cost, approximately $161,350.

Do I need a permit for a second story addition in Boston?

Yes, a second story addition typically requires building permits in Boston, MA. The average permit cost in Boston is $3,166. Always confirm requirements with the Boston building department before starting work.

Is a second story addition a good investment in Boston?

A second story addition provides an estimated 60% ROI nationally. In Boston, where the median home price is $512,971, this project costs about 62.9% of your home value. This is a significant investment relative to home value — consider carefully whether the local market supports premium renovations.

Second Story Addition in Boston, MA — Costs $129,080 to $806,750

What does second story addition cost in Boston? Average $322,700, ranging $129,080–$806,750. Labor runs $53.91/hr locally — 61% above the national average. Free breakdown with material + labor split.

Boston, MA Market

+61% vs national

Labor Rate

$53.91/hr

Material Index

143

Avg Permit Cost

$3,166

Median Home Price

$512,971

As one of the largest metros in Massachusetts, Boston 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 61% above the national average, Boston is one of the more expensive markets for home improvement — driven primarily by above-average labor rates in the region. With a median home price of $512,971, this second story addition represents just 62.9% of typical home value — a relatively small investment that can significantly boost curb appeal or functionality.

Low Estimate

$129,080

National: $80,000

Mid-Range

$322,700

National: $200,000

High End

$806,750

National: $500,000

Per Sq Ft

$484

National: $300

Duration: 4-8 months

DIY: Hard

Permits: Required

ROI: 60%

Second Story Addition Cost Calculator for Boston

Adjusted for Boston's labor rate ($53.91/hr) and material costs (index 143).

Project Size: 200 sq ft

50 sq ft1,000 sq ft

Quality Level

Mid-grade materials, good quality fixtures, standard options.

Estimated Total in Boston

$322,700

Based on 200 sq ft at mid quality, adjusted for Boston market rates.

Local Cost Breakdown

Labor (50%)$161,350

At Boston's average rate of $53.91/hr (80% above national avg)

Materials (50%)$161,350

Material cost index 143 (43% above national baseline of 100)

Second Story Addition vs. Home Value in Boston

Metric	Boston	National Avg
Second Story Addition (Mid-Range)	$322,700	$200,000
Median Home Price	$512,971	$350,000
Project as % of Home Value	62.9%	57.1%
Estimated ROI	60%	60%
Median Household Income	$92,000	$75,000

What Affects the Price in Boston

1Local labor rates ($53.91/hr in Boston)
2Material cost index (143 vs national 100)
3Total square footage added
4Structural reinforcement of first floor
5Staircase addition
6Roof removal and replacement

Popular Upgrades

Master suite
Additional bedrooms
Jack-and-Jill bathroom

Other Projects in Boston, MA

Accessory Dwelling Unit (ADU) Construction

$242,025

HardROI 80%

Room Addition

$145,215

HardROI 55%

Swimming Pool Installation

$102,492

HardROI 40%

Garage Addition

$88,743

HardROI 65%

Home Addition

$127,612

MediumROI 60%

Inground Swimming Pool

$101,299

HardROI 43%

Attic Conversion

$89,752

HardROI 64%

Swimming Pool Construction

$81,593

Professional OnlyROI 43%

Second Story Addition in Other Massachusetts Cities

Worcester, MA

$283,133

-12%Pop. 206,518

Springfield, MA

$269,733

-16%Pop. 155,929

Cambridge, MA

$325,033

+1%Pop. 118,403

Lowell, MA

$273,433

-15%Pop. 115,554

Brockton, MA

$268,533

-17%Pop. 105,643

Quincy, MA

$301,233

-7%Pop. 101,636

New Bedford, MA

$282,467

-12%Pop. 101,079

Lynn, MA

$266,567

-17%Pop. 99,989

Planning a Second Story Addition in Boston

Building permits are typically required for a second story addition in Boston. The average permit fee in this area is $3,166, though costs vary based on project scope. Permit fees in this market are above average — factor them into your total budget. Plan for 4-8 months from start to finish.

A second story addition is a complex project best left to licensed professionals. In Boston, skilled contractors charge an average of $53.91/hr, and the specialized nature of this work means cutting corners on labor can lead to costly rework.

With a median household income of $92,000, many Boston residents can budget for this project through savings. The mid-range cost of $322,700 represents 351% of the typical household's annual income.

Second Story Addition — National Guide

See the full national cost guide with DIY tips, cost factors, and ROI analysis.

All Construction Costs in Boston

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