ADU Construction in Redondo Beach
ADU construction in Redondo Beach drawn for plan check on uneven ground: height taken from measured grades, and walls rated where the house is close.
When the ground under a backyard unit is uneven, a Redondo Beach plan checker measures its height from the grade around it, so the drawings need spot grades at every corner and a clear reference for the roof's highest point. The reviewer also looks at the gap between the unit and the main house, since a tight gap changes what the facing walls must be built from. We survey those points before the layout is fixed.
Height on a sloping site
State law sets a minimum height that a city or county must allow for a detached unit, and the city's own code may permit more. On level ground the measurement is simple. On a slope, the reference can be natural grade or finished grade at each wall, depending on how the city's code defines it, and that choice moves the ridge up or down. We take spot grades on a grid, mark them on the site plan and draw a section through the steepest side so the checker can see where the roof stops. A low-slope roof can win back height when the numbers are tight.
The gap between two buildings
The residential code draws an imaginary line between the unit and the house, then treats each wall facing it like a wall near a property line. Where either wall sits within 5 feet of that line, it needs a fire-rated assembly, and its windows and doors are limited in size. Pulling the unit farther from the house can free the plan from those limits, though it uses more yard. We sketch both spacings and weigh them against setbacks, sewer fall and footing work. On a coastal lot, exposed connectors are specified in stainless or heavy-galvanized steel, since airborne salt pits plain metal.
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ADU Construction in Redondo Beach: questions
At a spot where the measured height, the setbacks and the gap to the house all work together. A unit cut into rising ground sits lower against the grade line and may gain room under the height limit, though it needs a retaining wall. A unit over falling ground stands taller on its low side. We test each candidate against the height rule before choosing.
Yes, for a single-level unit that stays at or under 500 square feet. Redondo Beach review of a backyard unit on a grade leans on the site plan, so ours carries the spot grades, the height reference and the distance to the house. Slope or soils engineering, and the construction itself, carry a separate quote.
Retaining and foundation depth come first. A cut into rising ground needs a wall with drainage behind it, and a pad over falling ground needs deeper footings or piers. Where the gap to the house is tight, rated wall assemblies and smaller openings add materials. A soils report, when the city asks for one, comes before the foundation is designed.
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