ADU Construction in Altadena
Altadena ADUs with deliveries sequenced to fit the gate and side passage, a hardened shell and drawings for Los Angeles County review, by Fernhill Builders.
Deliveries for an Altadena ADU are planned in the order they will be used, because the yard behind a house can only hold so much at once. Footing steel and form boards arrive first, then lumber, trusses and sheathing, then windows and doors once the shell is closed. Each load has to pass the same gate or side passage, so we measure its width and height and size every delivery to fit.
Measuring the way in
Our first walk notes each pinch point between the street and the pad: a gate post, a meter box, a hose bib, a low limb, a step in the path. If the route stays wide and firm, a compact excavator can dig the footings and wall panels can arrive prebuilt. Where it narrows, footings are dug by hand, concrete comes through a pump line and lumber is carried in shorter bundles. Plywood and temporary fencing protect the hardscape and planting along the route for the length of the job.
County review and the hardened shell
County plan checkers take an Altadena set, and where the parcel is on mapped hazard ground they check the exterior line by line, from the roof class and the vent listings to eave protection, glass type and siding. A narrow way in can also prompt questions about fire department reach, so the site plan shows the route from the street with its width marked. We answer each comment in writing, revise the affected sheets and copy you on every reply before it goes back.
ADU Construction in Altadena: common questions
Wherever an Altadena parcel lies within a mapped fire hazard severity zone, yes, and parts of Altadena are mapped. There the wildfire chapter requires ember-resistant vents, a roof of Class A rating, protected eaves, tempered glazing and a wall that is noncombustible, ignition-resistant or rated. County fire may add access or water supply conditions. Parcel status is confirmed before any sheet is drawn.
County plan checkers reading an Altadena set focus on the site plan, which marks the access route and clearances, and on the wall sections that show the hardened shell. That package suits a one-level unit within the size rule. Units with a second level or more floor area are quoted on their own.
Often, and the two jobs can share one delivery path behind the house. A rebuild and an ADU on one permit path may shorten county review. We check whether the lot and the rebuild permit allow both, then plan deliveries so neither job holds up the other.
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Tell us about the house and the adu construction work. We reply about a walk-through and a written scope.