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Math Can Be A Design Solution

4/30/2017

 
Math Can Be A Design Solution
I once wasted a day trying to lay out a building and parking on a site. It couldn't be done. The building footprint, plus parking, plus zoning setbacks equalled 92% of the area of the site. Tight, but do-able you are thinking; just get creative.

... Did I mention that the shape of the site had an offset that prevented an efficient parking layout? Some layouts came so close to working that I was sure there was a solution. Nope, the math wouldn't give.

If only I had worked the math first, I would have spent most of that day looking at alternatives like partial two-story, or a full two-story building, or simply explaining that we were wasting our time on this site.

This experience put me on the alert. So when a client wanted to know how big of a building would fit on his site, this spreadsheet was born. 

First I set up some fairly straightforward calculations for determining the area needed for parking. Next I looked at the impact of adding more stories would have. Finally I  addressed the limitations that zoning puts on projects - setbacks, height limitation, parking requirements. That is when I realized that this problem requires sophisticated math to solve - but fairly unsophisticated math to get an approximation. So into the spread sheet you put various guesses. The answer you get tells you what your next guesses should be. After a little trial and error you have better information than a half dozen schemes. 

The second part of the
spreadsheet  reverses the problem. How big of a site do you need for a building of 'X' SF?
 
In both cases some knowledge of site topography and building characteristics are critical. For instance, a site with too steep of a slope could be difficult to maximize. Or a three-story building with only 5,500 SF per floor might have less useable SF than a one or two-story solution because of the space tied up in steps, elevator, toilet rooms and even exterior wall thickness (multi-storied buildings have a higher ratio of exterior wall to floor area). Math doesn't tell you this, experience and common sense tell you this. 

Math and especially spreadsheets can be timesavers, but a calculator has all the math you
need to know. 

The actual spreadsheet is available for download here.
Math Can Be A Design Solution
Other tools might be helpful:

Trello-PM - project management system

FeeCalqs - fee estimating system

OFFPLAN - work load projecting system

MyCorbu - timekeeping and project bookkeeping system

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