WILSONVILLE OLD TOWN
Residential Design Standards
As Amended by Ordinance No. 851 October 2021
8.ExampleMiddleHousing Styles 16
9.
AccessoryBuildings,ADUs, and Garages
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10.
MaterialsandLot Coverage
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11.
Edges and Setbacks
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12.
Glossary of Terms
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Wilsonville Old TownResidential Design Standards were produced by The Urban Collaborative, LLC and Town Green in collaboration with the
City of Wilsonville and theOld Town Neighborhood Association.
DrawingsintheResidential DesignStandardsBookareforillustrativepurposesonlyandnottobeusedforconstructionpurposes.A
professionalarchitectorengineershouldbe consulted
foranyresidential construction.
TableofContents
1.
Introduction and History
1
2.
Purpose and Overview
2
3.
OldTownHistoric ResidentialTypes
3
4.
Using Design Standards
4
5.
Introduction to Styles
5
6. Style Guidelines
a. Western Farmhouse
6
b.
Craftsman
9
c.
New Ranch
12
7.
Renovation Guidelines
15
Boone’sFerryontheWillametteRiver,OSUSpecialCollections:GiffordPhotographic Collection
GeorgeLawCurryHouse,FrontView‐ 1934,OldOregonHistoricPhotos
Theareaasawholesharesavisualrichnessandcelebrateshistoriccharacter.The
historicalresidencesinthisareawereconstructedprimarilybetweenthe1880’sandthe
1930’s,creatingabeautifulsnapshotoftheerawhentheareawasfirstdeveloped.As
newhomesandbusinessesareconstructedintheneighborhood,itisimportantto
preserveOldTown’svisualhistorical identity.
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ThefollowingdesignstandardsreflecttheculturalcharacteristicsoftheBoone’sFerry
neighborhoodasithasdevelopedoverthepast160yearswhileintegratingthecurrent
community’s goals for the future. It provides a clear and straightforward set of
architecturalandplanningguidelinestopreservehistoricalintegrityasnewhomesare
constructedandexistinghomesare renovated.
WilsonvilleRailroadBridgeUnderConstruction‐ circa1907,Old OregonHistoricPhotos
IntroductionandHistory
ThecityofWilsonville,Oregonwasfirstdevelopedinthemid‐19thcenturyaroundthe
Boone’sFerrylandingontheWillametteRiver.Thelandingservedasthestartingpointfor
anewcommunitytospringup,initiallyconsistingofstores,hotels,shops,offices,and
banks‐‐ manyofwhichwerelaterconvertedintoresidences.Theneighborhoodsthatfirst
formedfromthissocialandeconomiclandmarkarereflectiveofthecity’shistoricculture
andcharacter.Themodern‐dayresultofthepreservationofthishistoricstyleisa
traditionalneighborhoodinwhichcollectionsofinterestinganddiversehousesand
sequencesofsmallshopsjointogethertocreatebeautifulstreetsandpublicspacesthat
preservearuralfeelwhileinanurban setting.
Western Farmhouse
Craftsmen
Ranch
ModernMix and Other
ResidentialScope Border
CityParks
Roads
TaxLots
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PurposeandOverview
TheseResidential DesignStandardsaredesignedwiththeintentionofpreservingtheunique
characterofWilsonville’sOldTownneighborhood,andunitingfuturedevelopmentprojects
withasharedvisionofpreservinglocaltraditions. Historic
architectureoffersimportantlessonsaboutmakingbuildingsworkatboththestreetand
pedestrianscale.TheDesignStandardsapplytothehomeswithintheredboundaryonthe
neighborhoodmaptotheright.ThismapshowsthestyleofhomeswithinOldTownandthe
currentmixofnewandhistorical homes.
OldTownWilsonvillemaintainsauniquecharacterreflectiveofaperiodbeforetherest
ofWilsonvilleexisted.However,astheCityofWilsonvillegrows,theneighborhoodhas
beenexperiencingdevelopmentpressures.Inordertomaintainthedesiredscaleand
massingforresidentialbuildingswithinOldTown,theDesignStandardspresentclear
guidelinesfornewbuild,renovations,oradditionstoexistingbuildingsinthe
neighborhood.
TheOldTownOverlayZone,withintheWilsonvilleZoningCode,refersdirectlytothese
DesignStandardsandthetwodocumentsshouldbereferredtoinconjunctionwhen
planninganynewhomesorwhenrenovatinghomesinOldTown.
Thisdocumentprovidessimple,clear,andobjectivestandardsthatillustratethe
patternsandelementsofarchitecturalstylesinOldTownWilsonville.Theguidelines
providetheCityofWilsonvilleandthecommunitywithtoolstominimizeproblems
regardingfuturedevelopmentandredevelopmentprojectsthatareinconsistentwith
thecontextofOldTown.ByprotectingthespiritandsenseofplaceinOldTown,the
look,feel,andcultureuniquetotheneighborhoodisalso preserved.
ExistingFarmhouse Styles
ExistingCraftsman Styles
ExistingRanch Styles
TheFarmhousestyleinWilsonvilledatesbacktowhentheneighborhoodwasfirst
developedinthe19thcentury.ThisstyleisprevalentthroughouttheWillametteValley
andconsistsprimarilyofasimplebuildingformwithaddedfeaturesandformstoadd
charactertothehome.Farmhousehomeshaveporchesandpitchedroofs,andhavea
traditionalandhistoricvisualstylesuchasverticalorhorizontalwoodsiding,vertically
alignedwindows,andalargefront porch.
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TheCraftsmanstylefirstappearedalongtheAmericanwestcoastattheturnofthe
20thcentury,featuringarts‐and‐craftsstyleelementsthatwerepopularatthetime.
Thisstyleusesdetailedfeatures,gabledporches,dormers,andstructurallyexpressive
elementstomaintainaclassicappearancewithacontemporarycharm.
TheStateHistoricPreservationOfficerecognizesstructuresthatare50yearsor
olderashistoricallyconsistentwiththecriteriaforlistingontheNationalRegisterof
HistoricPlaces.Forthisreason,theRanchstylehomewasaddedtothehistoric
residentialtypes.ThisadditionreflectstheevolvingnatureofOld Town.
TheRanchstylefirstappearedinthe1940’s,andwaspopularintothe1960’s.Thestyle
featuresalinearorshallowL‐shapedform,withlargefront‐facingwindowsanda
pitchedorhippedroof.Exteriorornamentationislimited,makingthesehomesa
versatileadditiontothishistoricneighborhood.
Old TownHistoricalResidential Types
TheresidentialhousingtypescurrentlypresentintheBoonesFerrydistrictofOld
TownWilsonvilleincludeFarmhouses,CraftsmanStylehomes,andRanchStylehomes
amongothermoremodernhomes.Topreservethehistoriccharacterofthe
neighborhood,thisdocumentwillfocusonthesethreehistoricstyles:Farmhouse,
Craftsman,andRanch,whichtogethercomposeabout80%ofthehomesinoldTown.
STEP 1: Identify Appropriate Architectural ProjectType
1. Isitnewbuildor renovation?
2. Isagarageorcarport planned?
3. IsthereanAccessoryDwelling Unit?
UsingDesignStandards
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STEP 2: Choose an Architectural Style
1. Underwhichofthethreearchitecturalstylesdoesyourprojectfit?
i. Howdoesthestyledefineroofs,windows,porches,doors,etc?
ii. Howmanystoriesdoesit have?
2. Doesyourbuildingheightfitintotheimmediatecontext?
i. Immediatecontextisdefinedasthehomesonthesameblockfaceastheprojectaswellasthehomesalongthefacing street.
a.Ifimmediatecontextis1story,staywithin1.5 stories
b.Ifimmediatecontextismixed,staywithin2 stories
c. IfprojectisalongSWBoonesFerryRoad,northofSW4th,dwellingsareencouragedtobe2stories
d.Regardlessofcontext,triplexes,quadplexes,andtownhousesarepermittedtobe25feetinheightandtwo stories.
3. Whatshape,form,andmassingwillthebuildinghave?
STEP 3: Identify Site and Lot Requirements
1. Arethereappropriatelandscapingneedstofitwithimmediate context?
2. Howwillthedevelopmentmeetsetbackstandardsandaddress edges?
3. DoesyourplanmeettheOldTownOverlayZoningcodeinareasnotcoveredbytheseDesignStandards?
Threedistincthistoricalbuilding
typologiesreoccurthroughoutthe
Boone’sFerryOldTownneighborhood
andcanbeusedtoguidefuture
residentialconstructionaswellas
additionsand renovations.
Whiletherearemodernarchitectural
stylesinOldTown,thesebuildingtypes
representthescale,massing,and
historicalprecedentdesiredbythe
community.
New Ranch
Thisstyleisoftenalongrectangular
shapeor‘L’plan.Itistypicallyonestory
withanattachedgarage,adornedwitha
largestreet‐facingpicture window.
Craftsman
Typicallyoneandahalfstories,thisstyle
featuresanintegratedporchwith
medium‐pitchedroofsanddormers.This
historicstyleisoftenrichlydetailedwith
structurallyexpressive elements.
Western Farmhouse
This style is typically two stories, in a ‘T’
or ‘L’ shape, and featuring an entry porch
andgable or hippedroofs.
IntroductionTo Styles
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WesternFarmhouseStyle
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• Nomorethantwodormers
onfront‐facing roof
• Nowiderthan10’
• Entranceplacedinthe
centerofwidehouses,at
thesideofnarrow houses
7:12‐ 12:12GableorOpenGableRoof
Roof Overhang
OptionalAttached Garage
TorL‐ShapedForm
Height:TwoStories
• 28’ Maximum
OptionalDormerwith Windows
Prominent Entrances
Front‐FacingSingleor
Double‐hungWindows
MassingandRoofs WindowsandDoors
•8’’Minimum
• 18’’Maximum
•4’’Minimumtrim
around windows
and doors
WesternFarmhouseStyle
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Optional Fireplace/Chimney
ProminentEntrance Porch
• Oneachlot,atleastoneporchmustbeprovidedonastreet‐facingfacade
• 6’wideby6’deeporlarger
• Porchcanbeinset,integral,or gabled
• Canbelinearor wrapping
Porches OtherElements
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WesternFarmhouseStyle
CraftsmenStyle
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OneorMore Dormers
RectangularorL‐Shaped Form
Proportionately Vertical
Double‐Hung Windows
MassingandRoofs WindowsandDoors
Height:1.5or2 Stories
• 1.5stories:20’ Max.
• 2stories:28’ Max.
6:12‐ 10:12PitchedRoofwith Eaves
• Frontridgeshallbeparalleltofrontyard
• 8’’MinimumEaves
• 18’’MaximumEaves
Trim
• 4’’Minimum trim
around windows and
doors, typically with a
cap molding
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CraftsmenStyle
Optional Fireplace/Chimney
OptionalBack Porch/Entry
Deep,Broad Porch
• Oneachlot,atleastoneporchmustbe
providedonastreet‐facing facade
• Integratedwithbuilding form
• Minimum6’deep,6’ wide
•PorchColumns
• ExposedRaftersandBeams
• Detailed Brackets
ExpressiveorExposedStructuralElements
OtherElements
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CraftsmenStyle
Porches
NewRanchStyle
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• Withorwithout inset
LinearRectangularorL‐Shaped Form
• Formrunsparalleltostreet
Height:One Story
Simply‐Designed Entry
Street‐Facing Picture
Slidingor Windows
4:12‐ 6:12HippedorGable Roof
Optional Attached Garage
MassingandRoofs WindowsandDoors
• 15’ Maximum
• Excepttriplexes,quadplexes,and
townhousesarepermittedtobe25feet
inheightandtwostories.
Eave Overhang
•8’’Minimum
• 18’’Maximum
NewRanchStyle
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SimpleFeatureswithMinimalOrnamentationPorchorPortico
GableorShed Roof
• Oneachlot,atleastoneporchmust
beprovidedonastreet‐facing facade
• Minimum6’ wide
• Minimum6’deep
• Porchesareencouragedonremodels
andrequiredfornew homes
AsymmetricalFacade Elements
OtherElements
• Shuttersareencouraged(but
optional)andshouldbesizedand
mountedasif operable.
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Porches
RenovationGuidelines
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Remodels,renovations,and/oradditionsshallcomplywiththesameDesignStandardsasnew
constructionexceptthatremodels,renovations,and/oradditionstostructuresexistingpriorto
December1,2017, includingthecreationofmiddlehousingthroughconversionoforadditionto an
existingsingle‐familyhome,mayelecttomatchtheexistingdesignofthestructureratherthan
complywiththeOldTownResidential DesignStandardsBookifallofthefollowingare met:
a.The height of the structure remains the same and any additions do not exceed the height of
theexisting structure;
b.Theroofpitchontheexistingportionofthestructureremainsthesameandismatchedfor
additionsinvolvingfacadesfacingastreetorpublicopen space;
c.Allexteriormaterialsaresubstantiallysimilarinstyleandtexturetotheexisting
materialsonthe structure;
d.For facades of the structure facing a street or public open space (does not include alleys) all
architectural elements, such as windows, doors, porches, dormers, details, etc. are kept the
same,or in the case of extending out a wall during anaddition, reproduced;and
e. Setbacks and lot coverage requirements of the underlying zone are met.
SeeWilsonvilleCodeSubsection4.138(.04) B.
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Newmiddlehousingshallmeetalldesignstandards
fortheapplicablearchitecturalstyle.
Newmiddlehousingshallalsomeettheapplicable
designstandardsinWilsonvilleCodeSections 4.113
(.14)‐ (.16),unlesstheyconflictwiththe standards
inthisdesign book.
NewRanch middlehousingis encouraged, butnot
required,tohaveentriesonseparatestreetssothat
oneormore primaryentrancefacesadifferent
streetfront.Thiscouldbeaccomplishedonany
corner lot.
This style is typically two stories, in a ‘T’
or ‘L’ shape, and featuring an entry porch
andgable or hippedroofs.
New RanchDuplex
Thisstyleisoftenalongrectangular
shapeor‘L’plan.Itistypicallyonestory
andadornedwithalargestreet‐facing
picture window.
Craftsman Duplex
Typicallyoneandahalfstories,thisstyle
featuresanintegratedporchwith
medium‐pitchedroofsanddormers.This
historicstyleisoftenrichlydetailedwith
structurallyexpressive elements.
ExampleMiddleHousingStyles
Western Farmhouse Duplex
©TheBungalow Company,Portland,Oregon
© Candace Kramer, Portland,Oregon
AccessoryDwellingUnits(ADU’s)inOldTownshall:
1. Size:ADU’sshallnotexceed600squarefeet ofliving space.
2. Design.ADU’sshallbeeither:
a.Detachedsingle‐storystructures;or
b.Overadetachedgaragemeetingthefollowing requirements:
i.ThegarageADUstructureis amaximum1.5 storiestall,not exceedingaheightof20feet;and
ii. Theprimarydwellingunitonthepropertyis 1.5or2stories tall.
3.Parking. EachADUshallhaveonededicatedstandardsizeparkingspaceonthesamelot.
AllotherstandardsofSubsection4.113(.10)relatedtoADU’sapply.SeeSubsection4.138(.04)C.Wilsonville Code.
STYLE GUIDELI NES
©E.AllenFineDesigns,SanJose,CA
WesternFarmhouse
RoofStyle: Gable
RoofPitch: 7:12to 12:12
Eaves: 8’’ minimum to 18’’ maximum
Craftsman
RoofStyle: Gable
RoofPitch: 6:12to 10:12
Eaves: 8’’ minimum to 18’’ maximum
NewRanch
RoofStyle:HiporLow‐PitchedGable
RoofPitch:4:12 to6:12
Eaves: 8’’ minimum to 18’’ maximum
Ordinance No. 825 Exhibit B
AccessoryBuildings,ADUs,and Garages
DESIGN
Design guidelines are applicable to any and all exterior building elements visible from the public right‐of‐way or
public parcel, in any direction, regardless of existing or proposed landscaped or natural visual barriers between the
public viewshed andexterior building elements.
Thegarageandotheraccessorybuildings over120sfand10ftinheightmustbedesignedusingthesameexterior
design and architecture (i.e.siding,windows,doors,and roofing materials) as the primary residence on the lot.
Accessorybuildingscannotbetallerthantheprimaryresidence.Iftheprimaryresidenceislessthan15feet,an
accessorybuildingcanbe15feetorless.
Frontof House
AD
U
Driveway
Driveway
≥ 15’
≥15’
≥15’
≤ 12’
≤ 12’
≥ 5’
≥ 5’
STREE
T
STREET
≥ 10’
Frontof House
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LOT COVERAGE
TheratioofbuildingtolotareaisapartoftheOldTownhistoriccharacter.Theexisting
communityisdevelopedtohavesmallerhomesonlargerlots.Thelotcoverageratiomaintains
theexistingbalanceandopennessofthe neighborhood.
Allbuiltstructuresare nottoexceed40%lot coverage*
Buildingsunder120sfand10ftinheightarenotcountedinlot coverage.
*Lotcoveragefortownhousesiscalculatedbasedontheoveralltownhouseproject,rather than
each townhouse lot. Cottage clusters are exempt from maximum lot coverage standards.
MaterialsandLotCoverage
MAT E R I A L S
Thefollowingconstructionmaterialsmaynotbeusedasanexterior finish:
1.Vinyl siding.
2. Woodfiberhardboard siding.
3. Orientedstrandboard siding.
4. Corrugatedorribbedmetal.
5.Fiberglass panels
Ordinance No. 851 Exhibit D
Page 87
Frontof House
ATTACHE
D
GARAGE
DETACHED GARAGE
ALLE
Y
STREET
STREE
T
Frontof House
≥ 10’
≥ 15’
≥ 4’
3-5’
≥ 15’
≥ 5’
≥ 5’
≥ 5’
≥ 5’
EdgesandSetbacks:Primary Residences
FRONT SETBACKS*
Street‐facing: Minimum 15’ from street edge to front of the house
PorchesaddedaspartofaremodeltoanexistingRanchhousecanencroach6feetintothe
front setback.
ResidencesalongSWBoonesFerryRoad,northofSW4thStreet:5feet minimumsetback
SIDEANDREAR SETBACKS*
Minimumsideyard:5’
Minimumrearyard: 15’
Minimumsidestreetsetback: 10’
*Forcottageclusters,minimumfrontandrearsetbacksare 10'.
Thewidthofgaragedoorsshallnotexceed50percentofthelengthofthestreet‐facingfaçade.
≥ 15’
GARAGES
Minimumfrontsetbackforanyandallgaragesand/oraccessorybuildingsis4feetfromthe
frontbuildingline,notincludingthefront porch.
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Whereaccessistakenfromanalley,garagesorcarportsmaybelocatedaminimumof3feet
andmaximumof5feetfromthepropertylineadjoiningthealley.Oraminimumof
feet,ifanadditionalparkingareais desired.
DRIVEWAYS
Forsingle‐familydetachedhomesandduplexes,maximum drivewaywidthatthefront
propertylineextendingtotheminimumrequiredprimarybuildingsetbackdimensionis
encouraged (but not required) to be no greater than 12 feet.
≤ 12’
Othermiddlehousingtypesmustmeettheapplicabledrivewaydesignstandards in
WilsonvilleCodeSubsection4.113(.14).
FACADE WIDTH
Forlotsover75feetwideatthefrontlotline,thewidthofasinglestreet‐facingbuilding
facadeshallnotexceedor60percentofthelot width.
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Accessorybuildings shall followthesamefront,rear,andsideyardsetbacksasprimary
dwellingsandfitwithinthe40%maximumlotcoverage(exceptaccessory buildings
thatarepartofacottageclusterareexemptfromlotcoverage standards).
Middlehousing oncornerscouldhaveentrancesonseparatestreetfronts.
Frontof House
ACCESSOR
Y
BUILDING
≥ 15’
≥ 15’
≥ 5’
≥ 5’
Frontof House
Frontof House
RANCH DUPLEX
≥ 10’
≥15’
≥ 15’
≥ 5’
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EdgesandSetbacks:AccessoryBuildings
CASEMENT WINDOWS
Awindowthatisattachedtoitsframebyoneormorehingesatthesideandopens outward
DORMER
Aroofedstructure,oftencontainingawindow,thatprojectsverticallybeyondtheplaneofa
pitchedroof.Dormerscanhavegable,hip,orflat roofs
“FRONTOFTHE HOUSE”
Thefirstbuiltelementoftheprimarydwelling:wall,porch,etc.
GABLE
Generally triangular portion of a wall between the edges of intersecting roof pitches
GABLE PORCH
Porchwithafrontfacing gable
GABLE ROOF
Tworoofsectionsslopinginoppositedirectionsandplacedsuchthatthehighest,horizontal
edges meet
HIP ROOF
Aroofwhereallsidesslopedownwardstothewalls,usuallywithafairlygentleslope.Ahipped
roofhousehasnogablesorotherverticalsidestothe roof
DOUBLE‐HUNG WINDOW
Verticallymovingwindowswithtwopanelswhereboththetopandbottompanels move
GlossaryofTerms
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