ADU Construction in San Marino, Sited by the Main
San Marino ADU construction sited by the sewer main: street or rear easement, depth and fall checked, then the older house's power and water tested.
Whether the public sewer main runs under the street in front of a San Marino house or along an easement behind the lot changes which part of the yard suits a new unit. With the main out front, the unit's drain runs forward beside the older house to reach it, so a spot nearer the house keeps that run short. With a main behind the lot, and a separate connection allowed, the far end of the yard can drain easily.
Finding the main and its depth
City sewer maps show where the main runs and roughly how deep it sits, and the cleanout at the house shows how deep the lateral leaves the building. A camera carrying a locating sonde confirms the route and finds any sag. Drain pipe for a unit must slope evenly to its connection, so the length of the run, measured against the depth available, limits how far the unit can stand from its connection. Where the yard cannot give enough fall, the choices are a raised floor, a shorter run or a sealed ejector pump.
Power, water and the house in front
With the drain point settled, the other services fill in. The main panel on the older house gets a load calculation, and a long feeder to a far corner needs larger conductors to limit voltage drop. Water branches off the house supply after a flow reading, and an old galvanized line is replaced if it cannot serve both homes. Inside, the main house keeps its plaster and millwork intact, because each connection is made at an outside wall or in the yard. Its street-facing windows and trim are not part of the job.
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ADU Construction in San Marino: common questions
Water can be the quiet limit. An older house may be served by a small meter and a supply pipe crusted inside, so a flow reading at the farthest hose bib comes before any branch is drawn. If the line falls short, it is replaced from the meter. The sewer is filmed, and the panel's rating is compared with the combined electrical demand.
Where the garage sits relative to the sewer connection matters as much as its condition. One near the street drains easily to a main out front, while one at the back may suit a rear main better. Then the structure is opened and judged, and the result is a conversion, a conversion with a pump, or a rebuild in the same place.
On a main house clad in wood, we measure the exposure of its boards, the width of its corner boards and the thickness of the sill under each window, and the unit is built to those sizes. On a stucco house, the texture is tried on a test board first. Either way, roof pitch and color are matched to the house.
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