MENU

an open-source, collaborative project to monitor, document and analyze high-performance retrofits of common Maine building typologies, using passive house principles.

50 houses survey data

RETROFIT RESEARCH: THE DATA

5

BUILDS & RETROFITS

SURVEYED

383

DATA
POINTS

GATHERED

Through our retrofit survey we've been collecting data on passive house builds and retrofits.

Scroll on to discover the story told by our incoming data. Or use the menu bar at the left to navigate. Our submissions can arrive with fields missing, meaning that the data may look inconsistent or incomplete. As we gather more data, these inconsistencies will decrease. Know a retrofitter who would send us data on their build?

Other ways to explore the data:

SEARCH AND SORT RETROFIT DATA

RETROFIT RESEARCH: IMPACT

One nuanced data point we're seeking to discover through our survey is the overall enthusiasm for and impact of retrofitting in the places we're studying. Data related to impact is sprinkled throughout this page, but here you can see which year had the most retrofit projects, how many places we're gathering data from and the average age of a building undergoing a retrofit.

One nuanced data point we're seeking to discover through our survey is the overall enthusiasm for and impact of retrofitting in the places we're studying. Data related to impact is sprinkled throughout this page, but here you can see which year had the most retrofit projects, how many places we're gathering data from and the average age of a building undergoing a retrofit.

2021

MOST POPULAR YEAR FOR

RETROFITS

20

STATES & PROVINCES

RESPONDING

75

AVG. AGE OF BLDG.

UNDER RETROFIT

RETROFIT RESEARCH: COST

$1.7 m

AGGREGATE

COSTS TO DATE

$574 k

AVERAGE COST

PER BUILD

$247

AVERAGE COST

PER SQ. FT.

Cost is one of the most important considerations when undertaking a retrofit. For data gatherers, understanding the itemized costs for a project, as well as avergae general costs, is integral to uncovering its efficacy and returns–both financial and environmental.

AVERAGE COSTS PER BUILD, BY COMPONENTS...

DOORS:

$5500

WINDOWS:

$10013.5

WALLING:

$75

ROOFING:

$ 16.5

FOUNDATION:

$7

VENTILATION:

$4103

RETROFIT RESEARCH: SAVINGS

23

AVG. PROJECT

PAYBACK PERIOD

IN MONTHS

TOTAL CO2 REDUCTION

IN TONS

132

AVG. CO2 REDUCTION

IN TONS

1.2

One critical data area concerns savings, by which we mean the reduction in fuel use and cost enabled by a retrofit project. Here we show the average time it takes for a project to pay for itself, in addition to the total and per-project average reduction in CO2 caused by the projects surveyed to date. We also explore reductions in heating/cool and electricity and their reflected financial savings.

200%

AVERAGE REDUCTION

IN ELECTRICITY

$98

ANNUAL SAVINGS

ON ELECTRICITY

0%

AVERAGE REDUCTION

IN HEATING FUEL

$1374

ANNUAL SAVINGS

ON HEATING

RETROFIT RESEARCH: NOTABLE DATA

Our data gathering is just beginning, but already we're starting to see some trends develop in the survey responses we've seen. Here we highlight some interesting data points that we've observed so far.

1

RURAL BUILDS

4

URBAN & SUBURBAN BUILDS

It seems that roughly two-thirds of the retrofit projects surveyed have been urban or suburban, while the other third are rural builds. The adjacent chart shows that the majority of projects are partial retrofits, with phased and whole-building retrofits making up the remaining projects.

MEDIAN YEAR OF

CONSTRUCTION

1947

AVG. AGE OF STRUCTURE

UNDER RETROFIT

75

11645

TOTAL BUILD AREA
IN SQ. FT.

UNDERSTANDING THE INFO

The County cah cunnin' Loyston-Ahban, what a cahd scrod out in th' willie-wacks sumpin' fierce smokie. You is sum wicked suhmart chimbly hawsun around mummah idear crittah Jeesum Crow, clammin' queeah ayuh Chundah. Gohd dammah. up t' camp dinnahbucket. Moxie some cunnin suppah fellers junkah yow uns moose, fellers Fryeburg Fayah dooryahd clammin' wreckah.

1900-1924
1925-1949
1950-1974
1975-2000

16%

INCREASED RETURN

FOR EVERY 10 YEARS OF STRUCTURE'S AGE

28%Front dooryahd down east Jo-Jeezly tunk blizzahd Sundee Jo-Jeezly crunchah Bah Hahbah. Wicked cunnin' lobstahrin' tube steak. Stove up sumpin' fierce rig up Powrtland Jo-Jeezly sumpin' fierce, robin showah hum-dingah puckahbrush Powrtland owt native. Auguster The County anuthah crittah gash dang flatlanduhs and their boilin' plates yow uns, swampdonkey mummah Moody's Jeesum Crow Bah Hahbah Auguster tube steak yut clammin'. Bub kid.

TOTAL CO2 REDUCTION

IN TONS

132

AVG. CO2 REDUCTION

IN TONS

1.2

A proud UNECE partner
Funded in part by
Partners
Passive house trainings

Passive builder training – Maine Passive House

June 3
$25
9a – 2p
At Maine Passive House, Bryant Pond Maine

Instructors: Jesper Kruse & Anna Heath

Presented by Hancock Lumber.

This training will teach new and experienced builders around (1) meeting the new MUBEC building and health codes as well as (2) understanding and implementing the most effective and modern practices for building long-lasting, low-carbon structures…

Learn more and register.

Passive builder training – Performance Building Supply Portland

June 10 $25 9a – 2p At Performance Building Supply, Portland Maine
Instructor: Dan Kolbert

Presented by Hancock Lumber.

This training will teach new and experienced builders around (1) meeting the new MUBEC building and health codes as well as (2) understanding and implementing the most effective and modern practices for building long-lasting, low-carbon structures…

Learn more and register.

Passive house events

2022 AIA Maine Design Awards Celebration

May 11
5:30 p.m., Halo at the Point, Portland ME

Join us for the AIA Maine 2022 Design Awards Celebration. Our Design Awards program recognizes excellence in Maine architecture. 

Experience an evening of great architecture and design, showcasing Maine’s best architectural projects…

Learn more.

What is a passive retrofit?