ADU Construction in Monrovia
Monrovia ADUs with the path from street to backyard measured for the engineered beam, footings sized by soils and ember-resistant details.
An engineered beam over the main room opening is the longest piece bound for the back of a Monrovia lot, so the path from the street is measured against it. Glulam or LVL comes in one length, and a beam that cannot turn the corner by the house has to be carried over a fence or lifted in. We check gate widths, tight bends and overhead wires before the beam is ordered, and plan its delivery for the day framing reaches that wall.
Where the beam lands
Each end of a long beam hands its share of the roof to a single post. On a Monrovia ADU the posts under a long beam carry concentrated loads, so the footing beneath each post is often wider and deeper than the wall footing beside it. The engineer sizes those pads, and we pour them with the hold-down bolts the posts need. Steel post bases keep the wood off the concrete and resist uplift. The beam itself is fastened to the posts with metal caps that hold it in place when the building sways.
Porches and decks on a mapped lot
Ember rules follow the state map, and parts of Monrovia sit inside mapped fire hazard severity zones. On a parcel there, a porch or deck attached to the ADU counts as part of the building, so its boards, posts and the underside of the floor have to meet ember-resistance rules too. We frame it with heavy timber or noncombustible posts, deck it with listed boards and close the space beneath with mesh or solid skirting. Its footings are tied to the unit's foundation plan. Plan review and the footing, framing and final inspections run through the city building department.
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ADU Construction in Monrovia: questions
Concrete sized by the engineer, usually a slab with deepened edges or a perimeter footing under a raised floor. For a Monrovia unit with a wide opening, the posts at each end of the beam get their own enlarged pads. The soils report sets the depth, and hold-down bolts go in before the pour.
Converting without new footings works only when the existing one is deep, continuous and sound. Opening the ground beside a Monrovia garage shows us its depth, and the engineer compares it with the bracing the room needs. Where a post or braced wall lands on weak concrete, a new pad or footing section goes in.
Monrovia ADUs built on a single level, holding no more than 500 square feet inside, fit the package. Wall drawings for a Monrovia unit in a mapped zone get careful review for vents and siding, and the package includes them. Larger or two-story units get their own price once the lot is reviewed.
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Describe the house and what it needs. We look at the structure first and send the quote in writing.