Human Scale Patterns: Lot Access

Human Scale Patterns: Lot Access


Note: This is the third post in a series exploring some simple patterns of human scale neighborhood design. These patterns, which I’ve observed in my own neighborhood, have been forgotten or overlooked as we now plan, design and live at the scale of the car rather than the person. However, these patterns are the key to building lasting value in neighborhoods.  The third of the three crucial patterns I’ll explore for designing valuable, walkable neighborhoods– is lot access.

Walkable neighborhoods draw a substantial portion of their value from the design of the public realm, and the quality and character of the public realm is largely determined by how each building and lot engages the streetscape.  Real estate agents commonly sell this as “curb appeal.” If we lack the discipline to design lot and building access at a human scale, instead emphasizing access for cars, the following negative impacts on the public realm and neighborhood character result:

  • Wide driveways are frequent and repeated on each lot, displacing landscape or social spaces.
  • Space for street trees is reduced causing the streetscape to become more barren.
  • Sidewalks are regularly interrupted, making walking less comfortable and less attractive.
  • On-street parking spaces are eliminated by curb cuts, increasing the speeds of traffic on the street and the desire for more parking on the lot (often in the frontage area).
  • Frontages are designed with parking and prominent garages, and are unwelcoming and uninteresting to people.
3D Google image of Lenexa
3D image of Brookside

These blocks have similarly-sized lots and houses. However, notice the lot access points and their proportion of the streetscape. The lower image shows single-lane and shared driveways lead to the rear of the lots, creating a more pleasant streetscape and walking environment (Image credit: Google Earth).

What may seem like small, individual decisions and rational, personal conveniences has compounding impacts when repeated on multiple lots on a block or throughout a neighborhood. When we develop in compact patterns on smaller lots – a necessity in walkable neighborhoods – these impacts escalate.  Each new addition corrodes neighborhood character rather than contributes to it.

Too often we mistake neighborhood character with a particular architectural style or aesthetic quality, and then attempt to replicate it without understanding important patterns that are essential to the character of a place.

Human-scale lot access patterns – featuring understated driveways and garages – follows some basic principles that improve neighborhood design:

  • Emphasize the streetscape and social spaces along the block
  • Maintain interesting and active lot frontages with details best experienced on foot
  • Avoid frequent curb cuts that interrupt the sidewalk and prioritize cars over people
  • Narrow driveway access as much as practical, especially in the lot frontage and closer to streetscape
  • Prioritize human-scale entry features, and locate garages on remote or internal portions of the lot
kc neighborhood
kc neighborhood

Human-scale lot access patterns – featuring understated driveways and garages – follows some basic principles that improve neighborhood character. In this example limiting the driveway width within the right-of way alnd lot frontage, and stepping the garage and parking pad beyond the entry feature and living quarters significantly affects how the lot and building relate to the streetscape (Image credit: Chris Brewster, Gould Evans).

When we observe patterns found in some of our most valuable neighborhoods, some simple rules of thumb for understated driveway and garages become evident. These rules are:

  • Limit the driveway access to a percentage of the lot width – generally between 10 percent and 20 percent maximum, with the lower end reflected in more compact urban areas and the higher end found in walkable suburban areas.
  • Use shared driveways, common lanes within blocks, or alleys if available, in circumstances where the general rule limits or eliminates private driveway access.
  • Limit the extent of garages on the front façade.
    • No front-loaded garages projecting in front of the building front entry feature
    • Garage width no greater than 15-35 percent of the front façade, dependent on context
    • Exceptions for where the prominence of garages can otherwise be reduced by design, location or grade (i.e. additional percentage if set back at least 12-20 feet behind the entry feature, or if blended with the grade such as a terrace)
  • Use alternative patterns such as side orientation, rear “auto courts” or detached garages where larger garage entries are desired.
Streetscape Comparison

These two neighborhood streets are both aligned by detached houses on compact lots. However, the streetscape differs due to the design of lot access. The neighborhood street in Bentonville, AR contains front-loaded double driveways, while the houses in North Kansas City are back-loaded, accessible by a shared alleyway. (Image credit: Chris Brewster and Abby Newsham, Gould Evans; Google Earth).

streetscape types combined

This neighborhood in Windsor, Colorado combines front-loaded private drives (both single and double) with back-loaded alleyway access. Interruptions in the streetscape are minimized, and the neighborhood provides a variety of lot access types. (Image credit: Chris Brewster and Abby Newsham, Gould Evans; Google Earth).

If we deviate from these rules and patterns, we are not designing human scale neighborhoods. Instead, we are accommodating the car at the expense of the public realm and neighborhood character. Human-scale places are at the root of what people truly value, and while access, parking and accommodating new needs of homeowners are important, it can be designed in a way that offers all the conveniences of car ownership, but still prioritizes engaging streetscapes. Understated driveways and garages help emphasize the person over the car, and help support other crucial patterns of neighborhoods designed for people.

Better arrangements can deliver the same convenience and amenities to an individual and neighborhood while still prioritizing public realm design and respecting the neighborhood character.  These human-scale patterns yield new options below:

Typology_blog

Image credit: Chris Brewster and Abby Newsham, Gould Evans

What kind of human-scale patterns do you see in your own neighborhood? Let us know your thoughts in the comment section below.

-The Kansas City Planning Studio of Gould Evans

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