Additions and remodeling in Hidden Hills, Los Angeles County

Home additions in Hidden Hills

Hidden Hills additions that open the back of the house begin with structural work: a beam, posts and footings, plus ember-resistant choices on mapped lots.

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Structural work comes first in a Hidden Hills addition when the plan opens the back of the house into a new family room. The wall coming out may carry the roof, so an engineer sizes a beam and posts to take that load before anything else moves. Some of Hidden Hills lies within mapped fire hazard zones, which means the new walls, roof and vents may also need to meet ember-resistance rules.

A beam where the wall used to be

Before the old wall comes down, temporary shoring holds the ceiling joists from both sides. The engineer specifies a steel or glued laminated beam, the posts that carry each end, and the footings under those posts, which often have to be larger than the old ones. Hold-downs and straps tie the new frame to the foundation so the opening resists lateral loads in an earthquake. The family keeps using the front rooms while this happens, since the opening stays sealed off with a dust wall until the addition is framed, sheathed and roofed.

Ember rules and the plan check

A mapped parcel calls for a Class A roof covering, vents fitted with fine metal mesh, noncombustible or ignition-resistant siding, and dual pane windows with a tempered layer. Eaves are boxed in and gutters get guards so dry leaves cannot collect at the roof edge. The building department that serves Hidden Hills checks those choices along with the structural sheets, and the setbacks and height on the plans must fit the city's rules. If the lot slopes, a soil report guides the footing depth. The same approach applies in nearby Calabasas and West Hills.

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