Room Additions in Mar Vista, Built in Sequence
Mar Vista room additions built in a set order, foundation to frame to roof and windows, with the old wall opened last. Attached ADU compared too.
The old exterior wall stays closed until the new room around it is dried in, and that rule sets the whole order of a Mar Vista addition. Footings and the floor go in, then framing, sheathing and roof, then windows and the water-resistive barrier. Only when that shell is sealed do we cut through to connect the rooms, so the house stays secure and dry while the new materials face damp air and salt.
Why the connection is cut last
Opening the existing wall early would leave the house exposed through the whole framing stage, to dust, moisture and passersby. Holding that step until the roof and windows are in keeps the living space usable and lets inspections on the new structure happen without the old house in the way. When the opening is finally cut, a header sized by the engineer carries the load above, and the floor levels are matched so the doorway has no step. Trim, flooring and paint then tie the two rooms together.
Salt air and the permit path
Salt and damp ocean air shorten the life of plain steel, so connectors, nails and flashing on a Mar Vista addition are hot-dip galvanized or stainless. Windows with corrosion-resistant hardware hold up better in the same conditions. LADBS issues the permit for this City of Los Angeles neighborhood, and reviewers there check zoning, the structure and the energy forms. If a parcel falls inside the coastal zone boundary, a coastal development permit may also apply, so the address gets looked up before the drawings start.
Room Additions in Mar Vista: common questions
Picture who will use the space a few years from now. If it is still the people in the house, an addition makes sense. If it could be a renter or a relative with their own kitchen and door, an attached ADU fits better. Mar Vista projects of either kind go through LADBS, under different rules for each.
Mar Vista additions need an LADBS building permit. If the address falls inside the coastal zone, a coastal development permit may be needed before the building permit issues. We look that up at the start, prepare the drawings and carry them through review.
Yes, once an engineer verifies that the footings and walls can carry the new floor and zoning allows the height. A Mar Vista upper floor follows the same order as a ground floor addition, structure and roof before the stair opening is cut through. Corrosion-resistant hardware goes into the new framing as well.
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