ADUs and additions, Monrovia, Los Angeles County
First Checks for an ADU in Monrovia
The first things we check on a Monrovia lot for an ADU: rear-yard access, setbacks, fire hazard mapping and utility routes, before any type is picked.
Access to the back of the lot is the first thing we look at in Monrovia. A narrow side yard, a gate, steps or a low wall all affect how framing and concrete reach a detached unit and where a trench for utilities can go. Next come setbacks, the sewer cleanout and the electrical panel, and together those tell us which unit types, from detached to JADU, the parcel can take.
Mapping and measuring on the same visit
Early on we look the parcel up on the fire hazard maps, because some Monrovia parcels are mapped and a lot inside one may need ember-resistant construction. That can mean a Class A roof covering, ember-screened vents, enclosed eaves, tempered glazing and siding that resists flame, and it changes the materials list before design starts. On the same walk we measure from the house to the side and rear property lines, look for recorded easements, and check how much space a new unit would keep from the main house for fire separation. Those numbers settle which types fit and where.
Turning the visit into a plan set
After the visit we write a feasibility summary that sets the possible unit types side by side for this parcel, with utility routes and any fire details noted on each. When you pick one, we draw it and file the plans with the Monrovia building department. The plan checker's comments come back in writing, and we respond on revised sheets. Construction is inspected in steps: footings first, then framing with plumbing and wiring still visible, then insulation, with a final sign-off closing the permit.
What we build in Monrovia
Second units and room additions lead, with the rest of our services available on the same lot.
Cities close by
Planning a unit in Monrovia?
Send the address. We check which ADU types the lot allows and reply with the next step.