South Pasadena New Construction Starting With a Fresh Survey

Is the old survey of a South Pasadena lot good enough to design a new house from? Usually a fresh boundary and topographic survey is needed. Here is why.

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Is the survey from when we bought the house good enough to build from? Standing on a cleared South Pasadena lot, the honest answer is usually no. An older survey may fix the lines, but a new house is designed from today's ground heights, corners checked in the field and every wall, tree and utility still standing. A fresh boundary and topographic survey gives the designer and the engineer that base.

What a new survey adds

The surveyor finds or resets the corner monuments and ties the lines to them, then shoots ground heights across the lot on a grid and at every break in grade. Walls, curbs, utility boxes, larger trees and the edges of neighboring structures near the line all go on the drawing. Height limits are measured from grade, setbacks from the lines and drainage from the spot heights, so each of those rules reads straight off this one sheet. Your old survey still helps, since any mismatch between the two is worth explaining early.

From survey to drawings

Once the survey is in, we lay the city's zoning standards for the parcel over it and mark the area a house can occupy. The soils engineer uses the same sheet to place borings, and the structural or civil engineer sets the finished floor and the drainage path from its spot heights. If a corner turns out to sit slightly off from what the old survey showed, the design moves with it now, on paper. The building department reviews the plans against that survey, and the surveyor may return to stake the footprint before excavation.

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