Roof Repairin Monrovia, CA
Roof repair and roof replacement in Monrovia follow one rule on every street: no wood roof covering of any kind, treated or not. Foothill properties in the fire zone face extra ember resistant rules, and landmark homes need a separate review. We could not confirm the City's re-roof permit rule, so ask the Building Division.
Monrovia is one of Los Angeles County's oldest cities. Lots in the townsite first went on sale on May 17, 1886, the Pacific Electric line arrived in 1903, and 1923 brought a record number of building permits, so the roofs over its older streets have been patched, overlaid or replaced more than once. The Monrovia Historic Preservation Group counts more than 2,500 homes built before 1940. The city sits in the San Gabriel foothills at 571 feet, where a roof meets long summer sun and a short, hard rainy season. NOAA's 1991 to 2020 normals for the Pasadena station, about 9 miles west-southwest of central Monrovia, show 20.08 inches of rain a year, 16.03 of them from December through March, plus 74.1 days a year at or above 90 degrees F and 9.5 at or above 100. Pasadena is a regional guide rather than a Monrovia reading, and foothill streets can differ from the valley floor.
The Census Bureau's 2024 five-year estimates, read on Census Reporter, count 14,855 housing units in Monrovia with a median owner-occupied value of $909,400. Data USA puts the owner-occupied share at 46.3 percent, which leaves about 53.7 percent renter-occupied by subtraction, so many roof decisions here belong to a landlord. We could not read the Census year-built table and print no share of older roofs. On a roof job, MDG Builders (CSLB #1040337) acts as the general contractor: we write the scope, check the parcel's fire and historic status, handle the permit and run the schedule, while a licensed C-39 roofing subcontractor does the tear-off and installation. Our roofing page has the sourced prices, the Monrovia overview lists every trade we manage here, and next door Arcadia and Azusa work under different rulebooks.
What Monrovia's Municipal Code and fire maps say about roofs
Where roofing permits come from in Monrovia: City of Monrovia Community Development Department, Building and Safety Division.
- Monrovia amends the roofing code (Municipal Code 15.04.260, amending Section 1507.1): no wood roof covering or roof covering containing wood or wood products may be installed, treated or untreated. Group R-3 additions with existing wood roofs may use matching material only if the new material is Class A or B, and concrete and clay tile must go over solid sheathing or spaced structural sheathing (spaced lumber only in Seismic Design Categories A, B and C).
- The same Monrovia section adds a clay and concrete tile attachment table (Table 1507.3.7) that sets fastening by wind speed, mean roof height and roof slope, and a footnote to Table 15 repeating the wood roof ban. Ask the Building Division which table version applies to a given roof.
- Monrovia's Wildland Urban Interface amendments (15.04.225 and 15.04.230) mean a roof on a new building or an addition in the WUI Fire Area follows the Chapter 7A ember resistant exterior rules, and a cumulative addition of 50 percent or more over 60 months pulls the existing construction under those rules too.
- In a potential historic landmark or district, Municipal Code 17.40.110(C) lets the Department, not the Commission, handle repairing or replacing deteriorated roofing with materials of the same kind, type and texture, along with windows, siding, chimneys, accessory structures and fencing. For a designated landmark or district contributor, 17.40.090 still requires a certificate of appropriateness for alterations.
- Monrovia's neighborhood compatibility design review exempts reroofing with a material similar to the existing one (Municipal Code 17.12.005(G)(4)), but the same chapter defines a change to the roof structure that needs a building permit as an exterior alteration.
- CSLB defines the C-39 Roofing classification as work that seals, waterproofs and weatherproofs buildings, using products such as asphalt, felt, urethane foam, metal roofing systems, shakes, shingles, tile and slate.
Are wood shake or wood shingle roofs allowed in Monrovia?
No, and the rule covers the whole city, not only the hills. Monrovia's amendment to the roofing section of the building code, Municipal Code 15.04.260, says no wood roof covering and no covering containing wood or wood products may be installed, treated or untreated. An addition on a Group R-3 house that already has a wood roof may use matching material only if the new material is Class A or B.
We read that text on GoCodebook, a third-party mirror of the Municipal Code, because the official code host was not opened by our research tools, so confirm the section with the City before materials are ordered. Wood is the ban to know about when someone offers to match an old shake roof during a repair. A few replaced shingles, an overlay and a full tear-off are three different jobs, and the written scope should say which one you are buying.
A proposal for roof repair in Monrovia should name the covering, the fire class of the finished roof and the roof area touched, so nobody has to guess later.
Is my Monrovia house in the Very High Fire Hazard Severity Zone?
Find out before you choose a covering. On July 1, 2025 the City Council adopted an ordinance updating Monrovia's Local Responsibility Area map to CAL FIRE's March 2025 recommendations. MonroviaNow reported in June 2025, before the vote, that the update would put 1,481 properties in the Very High zone, 619 in the High zone and 754 in the Moderate zone, almost all near the mountains, with construction standards, brush clearing and disclosure at sale for affected owners. That article named no neighborhoods, so we cannot say which streets are in.
The roof consequence sits in the Wildland Urban Interface amendments. Municipal Code 15.04.225 and 15.04.230 apply the Chapter 7A ember resistant exterior rules to new buildings and additions in the WUI Fire Area, and when additions made over 60 months total 50 percent or more of the original area, the existing construction must comply as well. The text we read does not say how the WUI Fire Area relates to the new map.
The Fire Department's prevention and codes page came from a search result, and monroviaca.gov blocked our tools, so we read none of it. We found no printed Class A roof rule for Monrovia parcels and will not state one. Ask the Fire Department to confirm your parcel before any bid names a covering.
Can I re-roof a landmark house, or one in the Wild Rose Tract or North Encinitas?
Monrovia has 169 local landmarks and two designated historic districts, according to the Monrovia Historic Preservation Group. The Wild Rose Tract Historic District covers 18 properties on the 300 block of Wildrose Avenue, and the North Encinitas Historic District covers 64 properties on the 100 and 200 blocks of North Encinitas Avenue. Municipal Code 17.40.090 requires a certificate of appropriateness from the Historic Preservation Commission before alterations to a landmark or a district property, and properties 70 years old are Historic Review Sites under 17.40.040.
Roofing has one gentler path. For a potential landmark or district, section 17.40.110(C) lets the Department, not the Commission, handle repair or replacement of deteriorated roofing with materials of the same kind, type and texture. Moving from tile to composition, or from one style to another, falls outside that wording, so treat it as a question for Planning. The code does not list the districts or say which streets hold landmarks, so ask which category your house is in before you sign a contract.
What does a Monrovia tile roof need underneath?
Monrovia's roofing amendment adds rules for tile. Clay and concrete tile must go over solid sheathing or spaced structural sheathing, and spaced lumber is allowed only in Seismic Design Categories A, B and C. The same section adds an attachment table, Table 1507.3.7, that sets fastening by wind speed, mean roof height and roof slope, so the number of fasteners per tile is a code item rather than a roofer's habit. Which version of the table applies to your roof is a question for the Building Division.
With so many homes built before 1940, plenty of roofs here sit on old boards and old framing, and a tear-off is the first honest look at the deck. A written proposal should state:
- Whether the deck is solid or spaced sheathing, and what goes over it
- The fastening schedule for tile, tied to the wind and slope table
- How rotted boards found after tear-off are priced, per sheet
- Whether reused tile is counted, and who replaces what breaks
Does roof replacement in Monrovia need a permit, and what about solar?
We could not confirm it. The City's building pages blocked our tools, so we have no Monrovia re-roof handout. What we can document is narrower: the exemption list in Municipal Code 15.04.070 names fences, retaining walls and low platforms or decks, the state model list has no roofing item, and the Building Division issues permits under Chapter 15.04. Treat roof replacement and repair as permitted work until the Building Division says otherwise. A permit also expires if work does not start within 12 months or stops for 12 months, and the Building Official can extend it by up to 180 days at a time.
Design review is a separate question. The neighborhood compatibility chapter exempts reroofing with a material similar to the existing one, although a change to the roof structure that needs a building permit counts as an exterior alteration. Rooftop solar of 10 kilowatts AC or less on a one or two family home has an administrative review under Chapter 15.52, with a permit within three business days for a complete application and one inspection. Panels usually have to come off before a tear-off, so schedule that step with the roofer.
How much does roof replacement cost in Monrovia?
No Monrovia price survey turned up, so this page prints no Monrovia price. The nearest sourced figures are for Los Angeles. Angi's roof page for Los Angeles, updated July 31, 2026, reports $4 to $12 per square foot for asphalt, $7 to $15 for tile and $7 to $16 for metal, with tear-off at $1,000 to $3,000 and panel removal and reinstallation at $500 to $1,000. Remodeling magazine's Cost vs. Value 2025 report prices one reference roof in Los Angeles at $36,417 in asphalt shingles and $62,069 in metal, and its roof size is unpublished, which explains much of the distance from Angi's survey of real jobs.
Monrovia adds scope that neither source prices. A tile roof needs the attachment schedule above, a foothill roof may need ember resistant details, and a landmark house may need a like for like conversation with Planning before any material is chosen. Ask each bidder to price those items on their own lines, and settle rotted decking with a unit price per sheet before you sign.
How do I hire a roofing contractor in Monrovia?
Roofing is CSLB license class C-39, which CSLB defines as work that seals, waterproofs and weatherproofs buildings with products such as asphalt, felt, urethane foam, metal roofing systems, shakes, shingles, tile and slate. Look up the license first with our guide to checking a contractor's license. Since January 1, 2025, AB 2622 lets an unlicensed person take only $1,000 of work in total, and never when a permit is needed or a worker is hired.
The contract matters as much as the license. Business and Professions Code 7159, amended by SB 517 effective January 1, 2026, requires a signed written contract before work starts, limits a down payment to $1,000 or 10 percent, whichever is less, and ties progress payments to finished work. On an MDG job, ask for the roofing subcontractor's license number and certificate of insurance, and read how general contractors use subcontractors to see who answers for what.
Roofing photos from Monrovia and nearby communities
Roof scenes tied to Old Town Monrovia, the Wild Rose Tract and North Encinitas blocks and the foothill streets, plus nearby communities such as Bradbury, Duarte and Sierra Madre.
Where these Monrovia roof figures come from
Every figure and its source is in the table on our roofing price page, and the California roof replacement cost guide explains why Angi and Cost vs. Value sit so far apart. Roof work often travels with fence and paint scope, which the Monrovia fencing page, painting page and kitchen remodeling page cover. To compare nearby rulebooks, read the roofing guides for Pasadena, Arcadia, Azusa and El Monte.
| What it covers | Typical range |
|---|---|
| Asphalt shingle, typical single-family roof | $10,000 to $25,000 |
| Concrete or clay tile | $7 to $15 per sq ft |
| Metal | $7 to $16 per sq ft |
| Remodeling Cost vs. Value 2025, Los Angeles | Asphalt $36,417. metal $62,069. |
| Extras | Tear-off $1,000 to $3,000. solar detach and reset $500 to $1,000. |
Monrovia roofing questions, answered
How much does roof replacement cost in Monrovia?
No Monrovia survey exists that we could find, so price by roof area using Los Angeles data. Angi's July 2026 Los Angeles page gives $4 to $12 per square foot for asphalt, $7 to $15 for tile and $7 to $16 for metal, before tear-off at $1,000 to $3,000. A measured written proposal is the real price.
Do I need a permit to replace my roof in Monrovia?
Plan on yes, but we could not confirm the City's rule. Monrovia's pages blocked our tools, the state exempt list has no roofing item, and Municipal Code 15.04.070 exempts other work such as short fences and low decks, not roofs. Ask the Building Division, and keep its answer in writing.
Can I put a wood shake roof on my house in Monrovia?
No. Municipal Code 15.04.260 bans any wood roof covering, or covering containing wood products, treated or untreated, on every Monrovia roof. Matching an old shake roof during an addition is allowed only with Class A or B material. We read the section on a third-party mirror, so confirm it with the City.
What is a Class A roof in California?
Class A is the top rating in fire testing under ASTM E108 or UL 790. We found no printed Class A rule for Monrovia parcels, and the Fire Department page blocked our tools. Properties in the fire zone follow ember resistant Chapter 7A rules for new buildings and additions, so ask the Fire Department about your parcel.
What is the 25 percent rule for roof repairs?
We found no California or Monrovia rule by that name, and sites that quote it rarely name a source. The percent triggers we can cite are in the fire amendments: additions totaling 50 percent or more of the original area over 60 months bring existing construction under Chapter 7A in the WUI Fire Area.
Should I repair or replace a 20 year old roof?
Condition matters more than age. Ask a roofer to photograph the flashing, underlayment and deck and to say what a repair cannot fix. In Monrovia the code bars installing any wood covering, so a shake roof cannot simply be patched with new shakes. We found no sourced lifespan for Monrovia roofs.
What is the best time of year to replace a roof?
The dry months suit a tear-off. NOAA's normals for Pasadena show 16.03 of 20.08 inches of rain from December through March and only 0.06 and 0.03 inch in July and August. Heat is the trade-off, at 74.1 days a year at or above 90 degrees F. We found no sourced price difference by month.
Can a general contractor do roofing in California?
A general contractor can run a roofing job, while the roof itself is done by a roofer holding CSLB class C-39. MDG Builders (CSLB #1040337) writes the scope, handles the permit and schedules a licensed roofing subcontractor. Before signing, ask for that subcontractor's license number and certificate of insurance.
How do I check a roofing contractor's license?
Enter the license number on the CSLB website, where the record shows classification, status, bond and workers' compensation. Roofing is class C-39. Our license check guide walks through the lookup, and a job that needs a permit is never covered by the unlicensed work limit.
Do solar panels change a roof replacement?
Yes. Panels usually come off before tear-off and go back afterward, which Angi's Los Angeles page prices at $500 to $1,000. Monrovia's Chapter 15.52 gives rooftop solar of 10 kilowatts AC or less on a one or two family home an administrative review, a permit within three business days for a complete application and one inspection.
Ask for a roof inspection in Monrovia
Send the street, the roof covering you have now and whether the house sits near the foothills or on a landmark list. We check the fire map and the review path before we call back.