ADUs and additions, Glendora, Los Angeles County
ADU Construction in Glendora
For a Glendora ADU we start with the fire hazard map for the parcel. What a mapped lot means for the roof, vents, walls, windows and each unit type.
Before we walk a Glendora lot, we pull up the state fire hazard maps for the parcel. Some Glendora parcels fall inside a mapped fire hazard zone, and a unit on one of those may be held to ember resistance rules covering its roof, vents, siding and glazing. On site, we then note what stands close to the planned footprint: plantings, fences, wood decks and the space left to the main house.
Building to ember rules
If the parcel turns out to be mapped, the new unit is detailed so embers find no way in. The roof takes a Class A assembly, with bird stops closing the open ends at the eaves and the ridge. Attic and crawlspace vents carry ember resistant baffles or fine metal mesh. Exterior walls get stucco or fiber cement over the sheathing, and each window uses dual glazing with at least one tempered pane. Gutter guards keep dry leaves from piling up at the roof edge. The plans also mark a strip around the walls kept free of bark mulch and easily lit plants.
How each unit type meets them
A detached cottage is new from footing to ridge, so every ember detail can be built in at once. An attached unit ties into the house, and where its roof and walls meet older materials those joints may need upgrading too. A garage conversion reuses an existing roof and siding, which we inspect against the same rules before the interior work is priced. A JADU stays within the house and adds the least new exposed surface. Glendora's building and safety staff review the ember details on the drawings and confirm them in the field at inspection.
What we build in Glendora
Second units and room additions lead, with the rest of our services available on the same lot.
Planning a unit in Glendora?
Send the address. We check which ADU types the lot allows and reply with the next step.