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Thread: Maximum paving on residential lot

  1. #1
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    Maximum paving on residential lot

    I was wondering if anyone has any codes or experience related to establishing a maximum allowed lot area to be paved for parking on a residential lot (single or multi-family lots). Currently we have a number of converted SF houses that now have several units and at the time they converted there was not any enforcement related to off street parking. Now we face the issue of how to require off street parking and is it better to have the entire lot paved to accomodate that or leave them parking on the street. We really don't want to see the entire lot paved so should there be a maximum allowed percentage of yard that can be paved?

    Any thoughts would be appreciated.

  2. #2
    Cyburbian IlliniPlanner's avatar
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    Rather than a maximum paving allowance, we have a maximum obstruction allowance, which would not only include driveways, patios and sidewalks, but porches, sheds, detached garages, etc.

    The maximum allowed is 40% in any yard (yard referring to front yard, back yard, and side yard, not to the entire lot). 40% of the entire lot could lead to certain yards being 100% obstructed.
    One lot of redevelopment prevents a block of sprawl.

  3. #3

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    I second IlliniPlanner's comments. We have the same sort of restriction on the amount of landscaping that has to be provided. Sometimes designers submit plans where they claim patterned concrete or paving stones as "hard landscaping".

    Typically the largest multifamily designs we see submitted on a standard 50 ft residential lot are for four units. We have a standard photocopied template that we give out to the designers which provides dimensions to create a garage for four vehicles, (one per unit) as well as a single outdoor stall for visitor parking, plus a garbage container and a small pathway up the side.

    To permit the five abreast parking, we have to relax our parking stall width standards.

  4. #4
         
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    We allow no more than a 70% lot coverage and a minimum of 30% landscaped private open space in situations like this. We also prohibit parking lots in front yards when s-f homes are converted to multiple units. Driveways leading to garages can't cover more than 50% of the front yard. Older lots that are deeper and have alley access work much better than those created post WWII. Not every lot can be converted regardless of the zoning.

  5. #5
    Cyburbian graciela's avatar
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    In single family residential, we have maximum lot coverage based on the minimum lot size for each zone. Make sense?

    40,000 sf min = 25% impervious
    25,000 sf min = 25% impervious
    15,000 sf min = 40% impervious
    8,000 sf min = 45% impervious
    5,000 sf min = 50% impervious

  6. #6
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    Thanks for the info!

  7. #7
    Super Moderator luckless pedestrian's avatar
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    we allow 25% in historic districts, just outside of the downtown village area and some rural zones
    residential zones in the village get 75%
    fragile rural zones get 10%

    and our % includes building, walks, paths, driveways - everything impervious

  8. #8
    Unfrozen Caveman Planner mendelman's avatar
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    We also have a maximum impevious surface requirement for SF - generally 50-55% (depending on lot area).

    Though, our multi-family districts have no impervious surface requirements, but there is no parking allowed in the front yard, so the front yards will remain pervious by default.
    I'm sorry. Is my bias showing?

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  9. #9
    Cyburbian solarstar's avatar
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    Is your concern with drainage, aesthetics, or both? If it's aesthetics, the numbers may be a lot different than for drainage. We have problems with drainage in Florida, so impervious surface is very strictly regulated (you couldn't possibly pave a front yard and avoid enforcement, and single-family residences can't really get over 50% coverage). We had some people try to use pervious concrete, and that was discussed on another thread. It sounds like you're looking at aesthetics - if so, pick a number (probably based on lot size as was previously suggested) and see how that works with your parking regs.

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