Sustainability
Designing sustainable communities with LEED-ND
One big shortcoming of the LEED green building code is its focus almost entirely on the building rather than the location. A building could get high marks in LEED with a green roof, cutting-edge stormwater management, effective heat insulation, electricity-saving equipment, and more, but be located in the middle of a former forest where the average employee drives 30 miles to work. Is that really saving the environment?
Enter LEED for Neighborhood Development (LEED-ND), a new type of LEED for new large-scale developments. LEED just opened up their draft for public comment. It's fascinating to read. They have to quantify every element, like whether a site has good linkage to the surrounding neighborhood, or too many dead-end streets within.
The draft also gives points for the bicycle network, buildings fronting onto the street, avoiding blank walls, mixed-income housing, unbundling parking, car sharing, historic preservation, and of course green building practices in the structures themselves.
LEED-ND isn't replacing the regular building LEED, but it's bringing good urban design practices into the LEED system. Next, LEED should adapt some of the concepts of LEED-ND into their code for individual buildings, giving more credit to developers who locate their office buildings near transit.
Comments
- Cyclists are special and do have their own rules
- M Street cycle track keeps improving, draws church anger
- O'Malley announces first projects using new gas tax money
- Can Loudoun grow while protecting its rural areas?
- ICC losing bus service in classic bait and switch
- Silver Spring mall could get massive facelift, new name
- WMATA launches "Short Trip" rail pass on SmarTrip







http://wwwsouthcapitolstreet.blogspot.com/2008/02/national-stadium-whitewash.html
by Douglas Willinger on Nov 18, 2008 12:47 pm • link • report
by DG-rad on Nov 18, 2008 1:01 pm • link • report
by DG-rad on Nov 18, 2008 1:04 pm • link • report
The 28 points necessary for LEED certification does not result in a building that is any better for the environment than the average new building in DC.
by Andy on Nov 18, 2008 1:52 pm • link • report
by Vik on Nov 18, 2008 2:06 pm • link • report
It is nice to see that they are starting to consider location since transportation is such a large portion of energy consumption/waste.
by Cavan on Nov 18, 2008 2:25 pm • link • report
by BeyondDC on Nov 18, 2008 2:34 pm • link • report
This is on track to happen. Eventually, there will be a single pool of credits, and the only difference between the various LEED rating systems will be the specific set of credits that are drawn from the pool.
Even though incorporating LEED-ND into the other LEED systems is in the works, it can only help matters if comments are sent in support of that.
@BeyondDC: How should LEED-ND include and measure good urban design? It would help enormously if the system could use human judgment, like (say) figure skating judges do. Given the constraint of being 100% objective and quantifiable, the LEED ND draft does reasonably well. But the draft standards still are no guarantee that a LEED certified development will be pleasant, comfortable or attractive -- and I say that as a contributor to LEED-ND.
by Laurence Aurbach on Nov 18, 2008 3:59 pm • link • report
by Andy on Nov 18, 2008 4:22 pm • link • report
If we take it as a given that walkable urbanism is important, then how can we define walkable urbanism in a measurable way? Start with the ingredients. To get walkable urbanism you need adequate density, access to a mix of uses, and a street/building layout that supports walking.
Density is easy. We know, for example, that it takes a minimum of about 12 units per acre to support a decent bus line. Units per acre of the project and of the project's surrounding neighborhood can be a criteria.
Mixed use is also easy. Draw a 1/4 mile radius around the project and count the uses. Compare to a checklist of important necessities such as convenience stores, and lower the score if your radius is missing a necessity.
Walkable layout is harder to quantify, but you could make a close approximation by looking at setbacks, % of land that isn't covered by building, size of block, entrances per block, average width of facade per block, presence of transit/biking, and maybe a few other indicators.
Combine and refine these suggestions and I think you'd have a pretty accurate measure of good urbanism. It would be time consuming and not perfect, but I think you could do it.
by BeyondDC on Nov 18, 2008 4:23 pm • link • report
Honesetly, I don't have a problem with that. It *should* be *much* easier to get a LEED rating on an urban site than a non-urban site. If the majority of your patrons are driving to get there, it should be virtually impossible to achieve LEED.
by BeyondDC on Nov 18, 2008 4:26 pm • link • report
by Andy on Nov 18, 2008 5:06 pm • link • report
Being in an urban setting *IS* a green feature, and an extremely important one at that. Locating in a place that makes the most efficient use of land and existing infrastructure makes a far greater difference to the environment than putting in low-energy light bulbs.
Are you actually suggesting that we ignore the most important factor in green design? Are you actually suggesting that we reward suburban buildings for spending lots of money and energy on fancy systems to solve problems (like run-off) that could be solved simply by locating in a city?
28 credits gets you to the very low-end of basic certification. You need more to reach Silver level, and much more to reach Gold or Platinum. Since locating in an urban area is by far the single most important factor in green architecture, I have absolutely no problem with saying that successfully doing the single most important thing is enough to get you low-level certification.
If you want high-level certification, do extra stuff, sure. Anyone who cares about LEED will know that basic certification is easy to get, and that only the higher-levels are really special. But I have no problem with rewarding buildings that start off by getting the big question right, and punishing buildings that start off by getting it wrong.
by BeyondDC on Nov 18, 2008 6:15 pm • link • report
Back when ZipCar and FlexCar were separate companies, one of the big differences between them was that FlexCar used mostly hybrid cars, while ZipCar used mostly regular ones.
So let's say there are four people:
Flint lives in a walkable neighborhood. He doesn't own a car, and only uses his FlexCar membership once a month to rent a hybrid.
Zebulon lives in a walkable neighborhood. He doesn't own a car, and only uses his ZipCar membership once a month to rent a non-hybrid.
Heidi lives in the suburbs and drives her hybrid Prius everywhere she goes.
Norm lives in the suburbs and drives his non-hybrid SUV everywhere he goes.
... By virtue of living in the city and only using a car once a month, Zebulon is living a much more environmentally friendly life than Heidi, who drives everywhere. The fact that Heidi drives a hybrid does make a difference, enough that she is out-greening Norm, but regardless of her hybrid car, Zebulon is doing much better.
Zeb is like the urban building without a lot of other "goodies", and Heidi is like the suburban building with lots of fancy green features. No matter how great Heidi's gas mileage is, she's still polluting more than the guy who only gets in a car once per month.
Flint, who got everything right, of course wins overall.
by BeyondDC on Nov 18, 2008 6:31 pm • link • report
@BeyondDC, what you've described is a fair outline of the current LEED-ND draft. And I'm sure the LEED-ND committee would appreciate your suggestions for refinements or even a complete re-framing, if you think it might be warranted.
@Andy: There's no question that past LEED systems have deserved criticism. But all LEED systems are steadily being tightened, year by year. The eventual performance goal is for top rated buildings to be net carbon neutral or even carbon positive.
by Laurence Aurbach on Nov 18, 2008 6:40 pm • link • report
by Dave Murphy on Nov 19, 2008 12:19 am • link • report
by Thayer-D on Nov 19, 2008 7:41 am • link • report
Absolutely. Which brings up an interesting question. Why is there no LEED-like rating system for zoning codes?
We should be calling out jurisdictions with bad codes, and rewarding those with good ones.
by BeyondDC on Nov 19, 2008 10:45 am • link • report
However, it is up to the politicians and the people who put them there, to demand that such rules are eventually adopted.
That is part of the purpose of the blog!
by Andrew on Nov 19, 2008 1:46 pm • link • report
Of course not. Nor is regular LEED meant to replace BOCA codes. But it would be nice if there were a LEED-like certification that communities could apply for that reviewed the greenness of their zoning regulations.
by BeyondDC on Nov 19, 2008 7:28 pm • link • report
by Laurence Aurbach on Nov 19, 2008 10:00 pm • link • report
Add a Comment