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Interested in diving deeper into the retrofit survey data? Use the table below to explore specific data points from each submitted survey. For an overview, we've organized all responses into a table, broken down by some of the most salient data, such as general location, square footage and retrofit type. To quickly compare surveys, sort the table by any of the data points in the header. Click on the icon to the left of any survey row to view the full survey submission.

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	Orig. construction year	State or Prov.	City	Retrofit cost per sq. ft.	Retrofit type	Lot type	Name	Email	Phone	Bldg. Co.	Builder's name	Architecture firm	Architect's name	Passive building consultant	Street address	Year work completed	Type of structure	Building use type	Project description	Why type of retrofit?	Area of structure	Renovated area	Start date	Project duration	Project goals	Lived in?	Historic structure?	Historic tax credits?	Passive house certified	Certified by?	ACH before	ACH after	Electrical cost before	Electrical cost after	Electrical usage before	Electrical usage after	Heat cost before	Heat cost after	Heat usage before	Heat usage after	Heat source before	Heat source after	Hot water cost before	Hot water cost after	Hot water system before	Hot water system after	Hot water energy usage before	Hot water energy usage after	EUI before	EUI after	Renewable energy?	Renewables description	Passive house materials	Passive house materials reasoning
	1855	ME	Monmouth	150000		rural	Dara Flynn	darasf@gmail.com	2073709733		Dara Flynn				584 Wilson Pond Rd	2024	wood-frame	residential	Complete new interior and exterior. Structural rebuilding where necessary, new heating, cooling, plumbing and electrical.		2000	2000	01/01/2022	28		no	no	no	no												a:1:{i:0;s:10:"wood-stove";}	a:2:{i:0;s:9:"heat-pump";i:1;s:10:"wood-stove";}			a:1:{i:0;s:8:"electric";}	a:3:{i:0;s:8:"electric";i:1;s:20:"air-source-heat-pump";i:2;s:27:"on-demand-tankless-electric";}							a:0:{}
	1902	MA	Cambridge	300		urban	Erika DeRoche	ed@zeroenergy.com	6178614795	Alpha Smart Builders	Deliandro Dias	ZeroEnergy Design	Erika DeRoche	ZeroEnergy Design	171 Columbia Street	2023	wood-frame	residential	Emergency reconstruction/ gut renovation of three-unit affordable triple decker with energy efficiency focus following a fire. Most of the existing siding remained with insulation and air sealing occurring from the interior, in addition to window replacement with triple glazed tilt/turn uPVC windows, electrification, all new building systems and complete interior renovation. The project is not attempting passive house certification but achieved DOE's Zero Energy Ready Homes certification and anticipates Enterprise Green Communities certification.		4700	4700	01/04/2022	12		no	no	no	no			1.46		4431		22155		1740			a:1:{i:0;s:5:"other";}	a:1:{i:0;s:9:"heat-pump";}		532	a:1:{i:0;s:5:"other";}	a:1:{i:0;s:20:"air-source-heat-pump";}		2658		16.06	no		a:0:{}
	1900	ME	Carrabassett Valley			rural	Ashley Hopwood Farrar	ashley@meldrumdesign.com	760-822-6417	N/A	Peter Neal	Meldrum Design	Ashley Hopwood Farrar	N/A	4003 Bigelow Station	2023	wood-frame	residential	Preserving an old train station (built in the early 1900's, I think. I could find out the exact year.) Replacing the 1980's addition on the back of the station. Energy retrofit to the whole thing. Here are a couple of social media posts about it: https://www.instagram.com/p/Cuy8fKMI7UI/?utm_source=ig_web_copy_link&igshid=MzRlODBiNWFlZA== https://www.instagram.com/p/CvuKyHrMLJR/?utm_source=ig_web_copy_link&igshid=MzRlODBiNWFlZA==		2700	2700	01/05/2023	6		no	no	no	no			-0.006									a:2:{i:0;s:15:"existing-boiler";i:1;s:10:"wood-stove";}	a:1:{i:0;s:9:"heat-pump";}			a:1:{i:0;s:5:"other";}	a:0:{}					no		a:0:{}
	1870	ME	Belfast	203	whole-building-retrofit	suburban	Alan GIbson	alan@gologic.us		GO Logic	Alan Gibson	GO Logic		Alan Gibson		2021	wood-frame	residential	Demolished existing ell and rebuilt it and renovated existing main house.	Need to be renovated and budget allowed. Owner driven.	2640	2640	01/07/2019		Leave as much exiting structure and interior finishes- insulate and air seal existing structure. Triple glazed windows and doors all new exterior finishes	no	no	no	no	n/a	20										a:1:{i:0;s:15:"existing-boiler";}	a:1:{i:0;s:9:"heat-pump";}			a:1:{i:0;s:5:"other";}	a:1:{i:0;s:20:"air-source-heat-pump";}					no		a:0:{}	didn't really come up
	2000	Maine	greenwood	$81/sf	phased-retrofit	rural	jesper kruse	jesper@mainepassivehouse.com	2078903203	Maine Passive House	Jesper Kruse	self	self	jesper kruse		2020	wood-frame	residential	2x6 walls. Added 9.5" tji to outside of 2x6 walls. Airtight membrances, triple pane windows, Lunos Ventilation	Needed new windows and new siding. I'm a PH builder so walking the talk	1960	1960	2015	40	Learning. Comfort. Energy savings.	yes	no	no	no		3.0ACH50	.47ACH50	720	1200			1500				a:2:{i:0;s:15:"existing-boiler";i:1;s:10:"wood-stove";}	a:2:{i:0;s:9:"heat-pump";i:1;s:10:"wood-stove";}	500	200	a:1:{i:0;s:5:"other";}	a:1:{i:0;s:20:"air-source-heat-pump";}					yes	solar/ 51 panels/17kwh	a:1:{i:0;s:5:"walls";}	Availability. What we have used on other projects. Price
		Quebec	Montreal	192	whole-building-retrofit	urban	Richard Price	constructionletournesol@gmail.com	1(514)475-3553	Construction Le Tournesol	Richard Price	Alias Architecture	Lucie Langlois	Lucie Langlois & Richard Price			wood-frame	--	Maison Ozalée		2850	2850		12	IPHA certification and LEED platinum	yes	no	no	yes-by-other-organization		.4						650				a:1:{i:0;s:8:"electric";}	a:1:{i:0;s:9:"heat-pump";}			0	0					no		0
	1900	Maine	Peaks Island	330	whole-building-retrofit	suburban	Rachel Conly	rachel@rachelconlydesign.com	2077665625	Thompson Johnson Woodworks	Heather Thompson	Rachel Conly Design LLC	Rachel Conly	Rachel Conly		2016	wood-frame	residential	Deep energy retrofit, dormer additions, complete new interior and exterior	needed total update/client request	1900	1900	a:1:{s:4:"date";s:4:"2014";}	24	total rebuild- both	no	no	no	no		17ACH50	.04ACH50	1874.71		10,486		1972				a:1:{i:0;s:15:"existing-boiler";}	a:3:{i:0;s:9:"heat-pump";i:1;s:8:"electric";i:2;s:10:"wood-stove";}	n/a		a:1:{i:0;s:8:"electric";}	a:1:{i:0;s:8:"electric";}			n/a		no		a:1:{i:0;s:4:"none";}	costs availablity
	2015	New York	Brooklyn, New York City		whole-building-retrofit	urban	Ryan Enschede	ryan@ryanenschede.com	347-663-6898	WM Dorvillier & Company Inc. (no longer in business)	Bill Dorvillier	Ryan Enschede Studio	Ryan Enschede	Jordan Goldman			masonry	--	Sound Studio, Gallery and Residence	Renovate to meet Owner's needs, upgrade to passive house performance, floodproofing.	2295	2295				yes	no	no	no		.8										a:1:{i:0;s:5:"other";}	a:1:{i:0;s:9:"heat-pump";}			0	0					no		0

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To certify or not to certify, the perennial passive house question

One thorny issue faced by passive house retrofitters is whether or not to have their buildings passive house certified. In this post, we’re going t...

certification