Written scope
Most Simi Valley homes were built in the 1960s and the 1980s, with a median construction year in the late 1970s.
New roof installation in Simi Valley, CA
New roof installation in Simi Valley is a different job from a re-roof: the roof goes onto a bare deck or a new structure, so deck condition, slope, drainage and ventilation are set at the start rather than discovered at tear-off.
- Asphalt shingles
- Clay tile
- Metal panels
- Photos before quotesYou see what we see
- Scope written firstMaterials listed line by line
- Deck checked at tear-offRotted sheets shown to you
- Magnet sweep at cleanupNails off the lawn
What is included in a roof installation
On a new build or an addition, the covering, underlayment, flashing and ventilation are specified together, and the permit route and Title 24 cool-roof values for the parcel are confirmed before materials are ordered.
- Full tear-off and disposalWe strip every layer of old roofing down to the deck and haul it away in dumpsters we place and remove. Your driveway and landscaping are protected with tarps, and we do a magnet sweep for nails before we leave.
- Deck inspection and repairEvery sheet of roof decking is checked for soft spots, delamination, and water damage. Rotted plywood is replaced on the spot so the new roof has a solid base. You get photos of the deck before we cover it.
- New underlayment and flashingWe install synthetic underlayment across the roof and ice-and-water shield in valleys and along eaves. Step flashing, valley metal, pipe boots, and chimney flashing are all replaced with new material, sealed and layered correctly.
- Ventilation sized to your atticRidge vents and intake at the soffits are matched to your attic square footage. Proper balance keeps attic temperatures down and extends shingle life from below. We do not guess at vent counts.
- Permit and inspection handlingWe pull the City of Simi Valley roofing permit, schedule the inspections, and meet the inspector on site. You do not have to chase paperwork or take time off work for the deck and final inspections.
- written scope terms registrationWe register your the roofing material manufacturer or the roofing material manufacturer system written scope terms and hand you the certificate at the final walk. If a covered defect ever shows up, you call us and we handle the claim with the manufacturer.
Roof installation for homes
For Simi Valley, a new roof must also suit inland heat and Santa Ana wind exposure, which is why ridge fastening, valley metal and flashing details matter as much as the visible covering.
- Worn shingles and bare spots
- Leaks around chimneys and valleys
- Hot attics with poor ventilation
- Storm damage and missing shingles
Roof installation for businesses
Simi Valley is an ageing tract re-roof market, not a new-construction market. Most Simi Valley homes were built in the 1960s and the 1980s, with a median construction year in the late 1970s. A large share of roofs therefore sit on homes 35 to 65 years old, at or beyond a first or second re-roof cycle on age grounds alone, so each roof still needs its own inspection.
- RetailFlat roof replacement scheduled around store hours
- OfficeLow-slope systems with proper drainage slope
- WarehouseLarge flat roofs built for heavy weather
- Multi-unitStaged work so tenants stay dry
What roof installation Simi Valley CA actually involves
Roof demand in Simi Valley is driven by inland heat and ultraviolet exposure, concentrated winter rain, and Santa Ana wind, not by snow. Rain is strongly winter-concentrated and summers are essentially dry, so valleys, flashings and drains sit dry and collect debris for months and are then tested in a handful of winter storms. Santa Ana gusts in Simi Valley have been recorded at 62 mph, as on 4-5 October 2013.
A recent local fire was the Easy Fire, 30 October to 2 November 2019, at 1,806 acres, ignited near Easy Street and Madera Road at the westerly end of Simi Valley. The Woolsey Fire ignited on 8 November 2018 south of Simi Valley on or near the Santa Susana Field Laboratory and burned about 80 percent of that site.
We strip the old roof, fix the deck, and build it back in layers that shed water.
How our roof installation process works
New roof installation in Simi Valley is a different job from a re-roof: the roof goes onto a bare deck or a new structure, so deck condition, slope, drainage and ventilation are set at the start rather than discovered at tear-off.
Inspection and scope
Rain is strongly winter-concentrated and summers are essentially dry, so valleys, flashings and drains sit dry and collect debris for months and are then tested in a handful of winter storms.
Permits and scheduling
Santa Ana gusts in Simi Valley have been recorded at 62 mph, as on 4-5 October 2013.
Tear-off and deck repair
A recent local fire was the Easy Fire, 30 October to 2 November 2019, at 1,806 acres, ignited near Easy Street and Madera Road at the westerly end of Simi Valley.
Installation
The Woolsey Fire ignited on 8 November 2018 south of Simi Valley on or near the Santa Susana Field Laboratory and burned about 80 percent of that site.
Cleanup and final walk
New roof installation in Simi Valley is a different job from a re-roof: the roof goes onto a bare deck or a new structure, so deck condition, slope, drainage and ventilation are set at the start rather than discovered at tear-off.
Tools and methods we use on every roof
Roofing nail gun and compressor
On a new build or an addition, the covering, underlayment, flashing and ventilation are specified together, and the permit route and Title 24 cool-roof values for the parcel are confirmed before materials are ordered.
Shingle remover and pry bar
For Simi Valley, a new roof must also suit inland heat and Santa Ana wind exposure, which is why ridge fastening, valley metal and flashing details matter as much as the visible covering.
Chalk line and roofing square
Simi Valley is an ageing tract re-roof market, not a new-construction market.
Fall protection harness and ladder stabilizer
Most Simi Valley homes were built in the 1960s and the 1980s, with a median construction year in the late 1970s.
Utility knife and roofing hammer
A large share of roofs therefore sit on homes 35 to 65 years old, at or beyond a first or second re-roof cycle on age grounds alone, so each roof still needs its own inspection.
Magnet sweeper
Roof demand in Simi Valley is driven by inland heat and ultraviolet exposure, concentrated winter rain, and Santa Ana wind, not by snow.
manufacturer installation instructions installation
Rain is strongly winter-concentrated and summers are essentially dry, so valleys, flashings and drains sit dry and collect debris for months and are then tested in a handful of winter storms.
manufacturer installation instructions system
Santa Ana gusts in Simi Valley have been recorded at 62 mph, as on 4-5 October 2013.
When Simi Valley homeowners install a new roof
Your shingle roof is 20 to 25 years old and you are seeing curling, cracking, or granules in the gutters.
A recent local fire was the Easy Fire, 30 October to 2 November 2019, at 1,806 acres, ignited near Easy Street and Madera Road at the westerly end of Simi Valley.
You just bought a Simi Valley home and the inspection report flagged the roof as near end of life.
The Woolsey Fire ignited on 8 November 2018 south of Simi Valley on or near the Santa Susana Field Laboratory and burned about 80 percent of that site.
A winter storm tore off shingles and you are worried about the next rain.
New roof installation in Simi Valley is a different job from a re-roof: the roof goes onto a bare deck or a new structure, so deck condition, slope, drainage and ventilation are set at the start rather than discovered at tear-off.
You are adding a room or re-roofing after a remodel and need the roof to match the rest of the house.
On a new build or an addition, the covering, underlayment, flashing and ventilation are specified together, and the permit route and Title 24 cool-roof values for the parcel are confirmed before materials are ordered.
Your tile roof is fine but the underlayment underneath has failed and you are getting leaks.
For Simi Valley, a new roof must also suit inland heat and Santa Ana wind exposure, which is why ridge fastening, valley metal and flashing details matter as much as the visible covering.
How roof installation works in Simi Valley
On a new build or an addition, the covering, underlayment, flashing and ventilation are specified together, and the permit route and Title 24 cool-roof values for the parcel are confirmed before materials are ordered.
- Wood RanchLarger two-story homes with complex rooflines and multiple valleys. Careful flashing detail matters here because there are so many transitions.
- Bridle PathMany tile roofs where the underlayment fails before the tile does. We lift and relay the tile over new underlayment to save the original material.
- Indian HillsSteep pitches and tall chimneys that need proper fall protection and chimney flashing rebuilt with new metal.
- Old Town Simi ValleyOlder ranch homes with original decking that often needs partial replacement during a tear-off.
- Tapo CanyonMixed residential and commercial buildings, including flat roofs that need modified bitumen systems with proper drainage slope.
- Summer attic temperatures above 140 degreesBakes shingles from below and shortens their life. We size ridge and soffit ventilation to keep the attic cooler and reduce the load on your AC.
From problem to finished result.
Two-layer tear-off in Central Simi Valley
BeforeMost Simi Valley homes were built in the 1960s and the 1980s, with a median construction year in the late 1970s.
AfterA large share of roofs therefore sit on homes 35 to 65 years old, at or beyond a first or second re-roof cycle on age grounds alone, so each roof still needs its own inspection.
Roof demand in Simi Valley is driven by inland heat and ultraviolet exposure, concentrated winter rain, and Santa Ana wind, not by snow.
Tile underlayment rebuild in Bridle Path
BeforeRain is strongly winter-concentrated and summers are essentially dry, so valleys, flashings and drains sit dry and collect debris for months and are then tested in a handful of winter storms.
AfterSanta Ana gusts in Simi Valley have been recorded at 62 mph, as on 4-5 October 2013.
A recent local fire was the Easy Fire, 30 October to 2 November 2019, at 1,806 acres, ignited near Easy Street and Madera Road at the westerly end of Simi Valley.
Flat commercial roof in Tapo Canyon
BeforeThe Woolsey Fire ignited on 8 November 2018 south of Simi Valley on or near the Santa Susana Field Laboratory and burned about 80 percent of that site.
AfterNew roof installation in Simi Valley is a different job from a re-roof: the roof goes onto a bare deck or a new structure, so deck condition, slope, drainage and ventilation are set at the start rather than discovered at tear-off.
On a new build or an addition, the covering, underlayment, flashing and ventilation are specified together, and the permit route and Title 24 cool-roof values for the parcel are confirmed before materials are ordered.
Roof problems we solve with a new installation
A recent local fire was the Easy Fire, 30 October to 2 November 2019, at 1,806 acres, ignited near Easy Street and Madera Road at the westerly end of Simi Valley. The Woolsey Fire ignited on 8 November 2018 south of Simi Valley on or near the Santa Susana Field Laboratory and burned about 80 percent of that site.
Recurring roof leaks after every storm
Simi Valley is an ageing tract re-roof market, not a new-construction market.
Missing shingles and exposed nail heads
Most Simi Valley homes were built in the 1960s and the 1980s, with a median construction year in the late 1970s.
Granule loss and bare spots on shingles
A large share of roofs therefore sit on homes 35 to 65 years old, at or beyond a first or second re-roof cycle on age grounds alone, so each roof still needs its own inspection.
Poor attic ventilation and high summer heat
Roof demand in Simi Valley is driven by inland heat and ultraviolet exposure, concentrated winter rain, and Santa Ana wind, not by snow.
Flashing failure around chimneys and valleys
Rain is strongly winter-concentrated and summers are essentially dry, so valleys, flashings and drains sit dry and collect debris for months and are then tested in a handful of winter storms.
A roof built in layers that keep water out and heat moving up and out.
Full system written scope terms
Santa Ana gusts in Simi Valley have been recorded at 62 mph, as on 4-5 October 2013.
Lower attic heat
A recent local fire was the Easy Fire, 30 October to 2 November 2019, at 1,806 acres, ignited near Easy Street and Madera Road at the westerly end of Simi Valley.
Storm-ready flashing
The Woolsey Fire ignited on 8 November 2018 south of Simi Valley on or near the Santa Susana Field Laboratory and burned about 80 percent of that site.
Curb appeal that sells
New roof installation in Simi Valley is a different job from a re-roof: the roof goes onto a bare deck or a new structure, so deck condition, slope, drainage and ventilation are set at the start rather than discovered at tear-off.
What roof installation costs in Simi Valley
Simi Valley is an ageing tract re-roof market, not a new-construction market. Most Simi Valley homes were built in the 1960s and the 1980s, with a median construction year in the late 1970s. A large share of roofs therefore sit on homes 35 to 65 years old, at or beyond a first or second re-roof cycle on age grounds alone, so each roof still needs its own inspection.
Roof demand in Simi Valley is driven by inland heat and ultraviolet exposure, concentrated winter rain, and Santa Ana wind, not by snow. Rain is strongly winter-concentrated and summers are essentially dry, so valleys, flashings and drains sit dry and collect debris for months and are then tested in a handful of winter storms. Santa Ana gusts in Simi Valley have been recorded at 62 mph, as on 4-5 October 2013.
- Roof size and pitchSquare footage drives material and labor. Steep pitches take longer and need more safety setup, which adds labor cost. A simple gable roof costs less per square than a cut-up roof with multiple valleys and dormers.
- Material choiceAsphalt shingles are the most affordable and still perform well in the valley heat. Tile, metal, and slate cost more upfront but last longer. We price each option so you can compare the long-term cost.
- Deck conditionSoft or delaminated plywood has to be replaced before the new roof goes on. On older Simi Valley homes we often find several sheets that need swapping. We quote deck repair separately so you see exactly what it costs.
- Number of layers to removeA second layer of old shingles adds tear-off time and disposal cost. Some roofs qualify for an overlay, but we usually recommend a full tear-off so we can inspect the deck and flashing.
- Flashing and ventilation scopeNew chimney flashing, skylight flashing, and balanced attic ventilation add to the project but prevent the leaks and heat problems that shorten roof life. We include them in the written scope so nothing is hidden.
- Permits and inspectionsThe City of Simi Valley requires a permit and inspections for tear-off and replacement. We include the permit cost in our quote and handle the paperwork and inspector visits for you.
These are published Oct-2026 regional market ranges, not Treggo Lume prices. A written estimate follows inspection.
What you receive
A recent local fire was the Easy Fire, 30 October to 2 November 2019, at 1,806 acres, ignited near Easy Street and Madera Road at the westerly end of Simi Valley. The Woolsey Fire ignited on 8 November 2018 south of Simi Valley on or near the Santa Susana Field Laboratory and burned about 80 percent of that site.
Deck photos
A large share of roofs therefore sit on homes 35 to 65 years old, at or beyond a first or second re-roof cycle on age grounds alone, so each roof still needs its own inspection.
What to know before you re-roof
For Simi Valley, a new roof must also suit inland heat and Santa Ana wind exposure, which is why ridge fastening, valley metal and flashing details matter as much as the visible covering.
Underlayment matters
Rain is strongly winter-concentrated and summers are essentially dry, so valleys, flashings and drains sit dry and collect debris for months and are then tested in a handful of winter storms.
Flashing is the weak point
Santa Ana gusts in Simi Valley have been recorded at 62 mph, as on 4-5 October 2013.
Ventilation extends life
A recent local fire was the Easy Fire, 30 October to 2 November 2019, at 1,806 acres, ignited near Easy Street and Madera Road at the westerly end of Simi Valley.
Roofing coverage across Simi Valley
- Central Simi Valley
- Wood Ranch
- Bridle Path
- Indian Hills
- Texas Tract
- Old Town Simi Valley
- Madera Hills
- Big Sky
- Sinaloa
- Santa Susana
- Corriganville
The Woolsey Fire ignited on 8 November 2018 south of Simi Valley on or near the Santa Susana Field Laboratory and burned about 80 percent of that site.
Talk to a Simi Valley roofer
Customer reviews are not published on this website yet. If you would like to discuss a roof in Simi Valley, call Treggo Lume Home Roofers at (805) 669-9300 or visit 1712 Erringer Rd, Simi Valley, CA 93065. A written scope follows inspection of the actual roof.
Roof installation questions Simi Valley homeowners ask
On a new build or an addition, the covering, underlayment, flashing and ventilation are specified together, and the permit route and Title 24 cool-roof values for the parcel are confirmed before materials are ordered.
A written scope follows inspection of the actual roof, because size, pitch, number of layers, material, access, and permit requirements all change the work. This website does not publish a firm price for this business; published market ranges elsewhere on this site are labelled as market data, not as a quote.
How long the work takes depends on the scope found on inspection: roof size, material, layers to remove, deck repairs, and weather. No completion time is promised on this website; scheduling is arranged by phone after inspection.
In the City of Simi Valley, re-roofing more than 10% of total roof area or more than 100 square feet requires a permit, per the City's FAQ. Published permit fee lines from the 1 July 2025 schedule are comp $472.70 and tile/special design $848.58 for the first area band, as line figures only, not an invoice total; confirm current fees at application.
The better choice depends on the house: tract or hillside position, roof pitch, weight the framing can carry, fire-zone status, and ventilation. Compare those factors for the actual roof rather than a single ‘best’ label, and confirm permit and fire-zone requirements for the parcel.
Get your roof installation Simi Valley CA estimate
For Simi Valley, a new roof must also suit inland heat and Santa Ana wind exposure, which is why ridge fastening, valley metal and flashing details matter as much as the visible covering.
Contact Our Simi Valley Roofers
Call Treggo Lume Home Roofers at (805) 669-9300 or visit 1712 Erringer Rd, Simi Valley, CA 93065, to discuss your roof.
Roof demand in Simi Valley is driven by inland heat and ultraviolet exposure, concentrated winter rain, and Santa Ana wind, not by snow. Rain is strongly winter-concentrated and summers are essentially dry, so valleys, flashings and drains sit dry and collect debris for months and are then tested in a handful of winter storms. Santa Ana gusts in Simi Valley have been recorded at 62 mph, as on 4-5 October 2013.
(805) 669-9300