Room Additions in San Marino
A San Marino addition has to shed water well. Cedarline Design Build plans roofs, grading and flashing first, then weighs an attached ADU beside it.
Think of the new roof as a catchment. Every added square foot of it delivers more water to a San Marino lot, and the walls and footing take the consequences if the path is wrong. So the drainage gets drawn with the framing, with gutters, leaders and the grade at the foundation working as one system. Once that holds, the room gets compared with an attached ADU drawn on the same lot.
Gutters and leaders
Rain from the new roof needs a route that ends away from the foundation. We size gutters to the roof area, run downspouts to a solid pipe, and carry the water to the street or to a landscaped area where it can soak in, as the lot allows. At the roof-to-wall joint, a small bent kickout directs flow into the gutter and stops it from running down the siding. Splash blocks are a poor ending, so we avoid them near the house.
Flashing the openings
Wherever the wall is cut for a window or door, the water barrier has to be rebuilt in layers. Flashing tape seals the sill first, the sides second and the head last, so each layer laps over the one below like shingles. A metal drip cap over the top sends runoff outward. Behind the siding, a ventilated gap lets any moisture that does get in dry out. Done right, these small parts stay out of sight and out of mind.
Room Additions in San Marino: common questions
Both add floor area, so the lot decides. An addition is limited by coverage and setbacks, while an attached ADU follows its own state-set size ceiling. We measure what your parcel allows for each and show them together, which turns the choice into a comparison of what can fit and how it would be used.
The work goes through the city building department with a permit for the building and linked permits for the trades. The submittal explains structure, energy use and drainage. We prepare it, answer the plan reviewer and book the inspections through to the final sign-off.
A second floor can work when the house below can carry it. The engineer reads the walls, footings and roof framing, and the new roof sheds more water, so gutters get resized too. Stairs, ceiling height and setbacks come next. We check each of them before drawing the upstairs rooms in earnest.
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