Square Footage - Method for Calculating: ANSI Z765 …
A M E R I C A N N A T I O N A L S T A N D A R D S I N S T I T U T E, I N C.
AMERICAN NATIONAL STANDARD FOR SINGLE-FAMILY RESIDENTIAL BUILDINGS
SQUARE FOOTAGE?METHOD FOR CALCULATING: ANSI Z765-2003
APPROVED NOVEMBER 2003
Reproduced with permission, NAHB Research Center, Upper Marlboro, MD. Further reproduction is strictly prohibited without written authorization of the NAHB Research Center. All rights reserved.
NAHB RESEARCH CENTER
Pub lis he d by NAHB Re s e arc h Ce nte r 4 0 0 Princ e Ge o rge ' s Bo ule vard Uppe r Marlb o ro , Maryland 2 07 74 -8 7 31 8 0 0 -6 3 8 -8 5 5 6 pho ne 3 0 1 -4 3 0 --6 1 8 0 fa x
Co pyright 2 0 0 3 by NAHB Re s e arc h Ce nte r. All rights re s e rve d.
No part o f this pub lic atio n m ay b e re pro duc e d in any fo rm ? m e c hanic al, e le c tro nic , o r o the rwis e ? witho ut the prio r writte n pe rm is s io n o f the publis he r.
Printe d in the Unite d State s o f Am e ric a.
CONTENTS
STANDARD
1 SCOPE AND PURPOSE PAGE 1
2 DEFINITIONS PAGE 1
3 CALCULATION OF SQUARE FOOTAGE PAGE 2
4 STATEMENT OF FINISHED SQUARE FOOTAGE PAGE 3
ANNEX
COMMENTARY ON ANSI Z76 5 PAGE 4
FIGURES
1 ENTRY-LEVEL PLAN PAGE 6
2 UPPER-LEVEL PLAN PAGE 7
3 BASEMENT PLAN PAGE 8
4 BUILDING SECTION PAGE 9
5 BUILDING SECTION PAGE 1 0
6 STAIRS PAGE 1 1
SQUARE FOOTAGE? METHOD FOR CALCULATING: ANSI Z76 5 -2 0 0 3
FOREWORD
An Ame ric an Natio nal Standard is de ve lo pe d thro ugh a c o nse nsus pro c e ss that invo lve s tho se o rganizatio ns and individuals dire c tly and mate rially affe c te d by the e xiste nc e o f a standard. A standard itse lf is a vo luntary guide fo r pro duc e rs and c o nsume rs. The Ame ric an Natio nal Standards Institute is the c e ntral bo dy re spo nsible fo r ide ntifying a single , c o nsiste nt se t o f vo luntary standards and ve rifying that the princ iple s o f o pe nne ss and due pro c e ss are he e de d. All Ame ric an Natio nal Standards are subje c t to pe rio dic revie w and revisio n.
A standard allo ws individuals and o rganizatio ns that use diffe re nt te rmino lo gie s base d o n diffe re nt po ints o f vie w to c o mmunic ate , c o o pe rate , and c alc ulate quantitie s o n a c o mmo n basis. This standard pro mo te s the se go als in the ho pe that square fo o tage c alc ulatio n c an be c o me an ite m o f agre e me nt rathe r than a po int o f c o nte ntio n be twe e n gro ups with diffe re nt inte re sts and c o nc e rns.
This standard fo r the c alc ulatio n and re po rting o f abo ve -grade square fo o tage and be low-grade square fo otage in single -family ho use s is o ffe re d fo r vo luntary applic atio n. The standard must be applie d as a who le . The standard is no t me ant to re plac e o r supe rse de any le gal o r o the rwise re quire d e xisting are a me asure me nt me tho d. It may be use d in pro po se d, ne w, o r existing single -family ho use s o f any style o r c o nstruc tio n but is no t applic able to apartme nt/ multifamily buildings. It do e s no t c o ve r ro o m dime nsio ns.
Be fo re the ado ptio n o f the standard in 1 9 9 6 , no natio nwide standard e xiste d in the Unite d State s fo r me asuring square fo o tage in single -family ho use s. By c o ntrast, a standard applic able to c o mme rc ial buildings has be e n in e ffe c t fo r 8 0 ye ars. In 1 9 1 5 , the Building Owne rs and Manage rs Asso c iatio n Inte rnatio nal (BOMA) deve lo pe d a standard me tho d fo r me asuring flo o r are a in o ffic e buildings. The BOMA standard was revise d in 1 9 5 2 , 1 9 5 5 , 1 971 , 1 9 8 0 , 1 9 8 9 , and 1 9 9 6 and now be ars the title Standard Me tho d fo r Me asuring Flo o r Are a in Offic e Buildings, ANSI/BOMA Z6 5 .1 -1 9 9 6 .
The Ontario New Ho me Warranty Pro gram issue d Builde r Bulle tin No . 2 2 ? Flo o r Are a Calc ulatio ns o n No ve mbe r 1 5 , 1 9 8 9 . The bulle tin's se t o f re quire me nts fo r unifo rm flo o r are a c alc ulatio n applie s to single -family ho use s and c o ndo miniums that e nro ll in the pro gram and o nly whe n a nume ric value fo r flo o r are a is use d in adve rtising and sale s mate rials, in an agre e me nt o f purc hase and sale , in a c o nstruc tio n c o ntrac t, o r whe neve r the size o f the ho use is state d in printe d mate rials. Ove r the ye ars, o the r gro ups have deve lo pe d the ir o wn c o nve ntio ns fo r square fo o tage c alc ulatio n within the ir o rganizatio ns.
In April 1 9 9 4 , the Natio nal Asso c iatio n o f Ho me Builde rs (NAHB)? at the re que st o f the Ho me Builde rs Asso c iatio n o f Gre ate r New Orle ans and o the r builde r me mbe rs? c o mmissio ne d the NAHB Re se arc h Ce nte r (a who lly o wne d subsidiary o f NAHB) to ac t as se c re tariat fo r an ANSI Ac c re dite d Standards Co mmitte e and to asse mble a gro up o f o rganizatio n re pre se ntative s and individuals mate rially and dire c tly affe c te d by the deve lo pme nt o f an ANSI Standard fo r the me asure me nt o f square fo o tage in de tac he d and attac he d single -family ho use s. The c o mmitte e he ld its first me e ting o n Nove mbe r 2 2 , 1 9 9 4 .
ANSI pro c e dure s re quire pe rio dic revie w to e nsure that standards are c urre nt and re levant. In 2 0 0 1 a standard c o mmitte e was fo rme d to c o nside r c hange s to the 1 9 9 6 e ditio n o f ANSI Z76 5 . The c o mmitte e ac c e pte d c hange s to Se c tio n 4 o f the standard and to its Anne x. The c hange s to Se c tio n 4 c o nsiste d o f an e dito rial re o rganizatio n o f its pro visio ns and the additio n o f a subse c tio n spe c ifying re po rting re quire me nts fo r c alc ulatio n re sults pro duc e d using o the r me asure me nt me tho ds. The c hange s to the Anne x c o nsiste d o f (1 ) the additio n o f a de sc riptio n o f de c o rative finishe s fo r c o nc re te flo o rs, alo ng with re c o gnitio n o f this type o f c o nc re te flo o r as a type o f flo o r finish; and (2 ) the additio n o f te xt ac kno wle dging that the standard do e s no t addre ss diffe re nc e s be twe e n c alc ulatio ns made by multiple partie s fo r the same pro pe rty.
The standard e mbo die s o ne info rmative Anne x that is inte nde d to c o mme nt o n and illustrate the standard; howeve r, the Anne x is no t c o nside re d part o f the standard.
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SQUARE FOOTAGE? METHOD FOR CALCULATING: ANSI Z76 5 -2 0 0 3
Sugge stio ns fo r impro ve me nt o f the standard are we lc o me and sho uld be fo rwarde d to the se c re tariat: NAHB Re se arc h Ce nte r 4 0 0 Princ e Ge o rge 's Bo ule vard Uppe r Marlbo ro , Maryland 2 07 74 -8 7 3 1 3 0 1 -2 4 9 -4 0 0 0 pho ne 3 0 1 -4 3 0 -6 1 8 0 fax http:/ / nahbrc .o rg This standard was pro c e sse d and appro ve d fo r submittal to ANSI by the Ac c re dite d Standards Co mmitte e o n Re side ntial Square Fo otage , Z76 5 . Co mmitte e appro val o f the standard do e s no t ne c e ssarily imply that all c o mmitte e me mbe rs vo te d fo r its appro val. At the time it appro ve d this standard, the Z76 5 Co mmitte e c o nsiste d o f the fo llo wing me mbe rs liste d in the right c o lumn.
Wayne M. Fo ley, Chair Tho mas Ke nne y, Se c re tariat? NAHB Re se arc h Ce nte r
NAME OF REPRESENTATIVE AND ORGANIZATION REPRES ENTED
Paul Arm s tro ng Inte rnatio nal Co de Co unc il
Craig Aub e rge r Am e ric an As s o c iatio n o f Ce rtifie d Apprais e rs
Jo hn Battle s Inte rnatio nal Co de Co unc il
Ro n Burto n BOMA Inte rnatio nal
Mark Cham b e rs Go dfre y-Cham b e rs Ho m e s , Inc .
Ge rald Davis Inte rnatio nal Ce ntre fo r Fac ilitie s
Wayne Fo le y W. M. Fo le y Co ns truc tio n Gro up
Swayn Ham le t Natio nal As s o c iatio n o f Re alto rs
Charle s Hardie Fran-Hardy Ho m e s , Inc .
Jam e s Hill Natio nal Ins titute o f Standards and Te c hno lo gy
Jane Kne e s s i U.S. De partm e nt o f Co m m e rc e , Bure au o f the Ce ns us
A.J. To ny Martine z Yavapai Co unty As s e s s o r
Jam e s Nanni Co ns um e rs Unio n
Trac y Riggan MCL Co mpanie s
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SQUARE FOOTAGE? METHOD FOR CALCULATING: ANSI Z76 5 -2 0 0 3
AMERICAN NATIONAL STANDARD FOR SINGLE-FAMILY RESIDENTIAL BUILDINGS
SQUARE FOOTAGE?METHOD FOR CALCULATING: ANSI Z765-2003
1. SCOPE AND PURPOSE
Scope
This standard de sc ribe s the pro c e dure s to be fo llo we d in me asuring and c alc ulating the square fo otage o f de tac he d and attac he d single -family ho use s.
Purpose
It is the purpo se o f this standard to de sc ribe a me tho d o f me asure me nt that will make it po ssible to o btain ac c urate and re pro duc ible me asure me nts o f square fo o tage in single -family ho use s.
2. DEFINITIONS
Attached Single-Family House
A ho use that has its o wn ro o f and fo undatio n, is se parate d fro m o the r ho use s by dividing walls that e xte nd fro m ro o f to fo undatio n, and do e s no t share utility se rvic e s with adjo ining ho use s; may be kno wn as a to wnho use , ro who use , o r duple x, fo r e xample .
Detached Single-Family House
A ho use that has o pe n spac e o n all its side s.
Finished Area
An e nc lo se d are a in a ho use that is suitable fo r ye ar-ro und use , e mbo dying walls, flo o rs, and c e ilings that are similar to the re st o f the ho use .
Garage
A struc ture inte nde d fo r the sto rage o f auto mo bile s and o the r ve hic le s.
Grade
The gro und le ve l at the pe rime te r o f the exte rio r finishe d surfac e o f a ho use .
Level
Are as o f the ho use that are ve rtic ally within 2 fe e t o f the same ho rizo ntal plane .
Square Footage
An are a o f a ho use that is me asure d and c alc ulate d in ac c o rdanc e with the standard. Whe n e mplo ying Me tric o r Standard Inte rnatio nal (SI) me asure me nt units, the te rm flo o r are a is use d in plac e o f square fo o tage .
Unfinished Area Se c tio ns o f a ho use that do no t me e t the c rite ria o f finishe d are a.
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