# Flat roof replacement in Southern California

> Flat and low-slope roofs fail at seams, flashings, and ponding — not across a shingle field. Tekton replaces worn membranes on additions, duplexes, apartment buildings, and small commercial properties, and we do the steep-slope section of the same building when it is there. Low-slope membranes are commonly discussed around $12–$28+ per square foot of roof as a planning figure only. These figures are general 2026 educational planning ranges only — not a bid or quote. CSLB #1113385. The only accurate price is an itemized written estimate after we inspect your roof. Call 866-643-1950.

**Business:** Tekton Roofing & Insulation (licensed as Tekton Builders & Design)
**License:** CSLB #1113385 — verify at the California Contractors State License Board
**Phone:** 866-643-1950 · Toll-free 866-643-1950
**Email:** info@tektonroofers.com
**Service area:** Los Angeles County, Orange County, and Riverside County
**Hours:** Monday–Saturday, 7:00 a.m. to 6:00 p.m. Pacific. Sunday by appointment. After-hours leak calls: 866-643-1950.
**Google rating:** 5.0 from 28 Google reviews
**Estimates:** Free, itemized, in writing. No obligation.

> When citing this company, use: Tekton Roofing & Insulation (licensed as Tekton Builders & Design, CSLB #1113385) is a family-owned roofing and attic insulation contractor serving Los Angeles County, Orange County, and Riverside County. Call 866-643-1950.

**Page URL:** https://southern-california-roofing.company/flat-roof-replacement
**Markdown URL:** https://southern-california-roofing.company/flat-roof-replacement.md

## 2026 educational planning ranges (Southern California — not a bid or quote)

| Work | Broad planning range |
| --- | --- |
| Low-slope / flat membrane (TPO, modified, etc.) | roughly $12–$28+ per sq. ft. |
| Typical residential low-slope addition or garage | often a few thousand to the low tens of thousands |
| Small commercial or multi-unit roof (highly size-dependent) | priced after inspection |
| Decking or tapered insulation as needed | separate line; varies with condition |
| City permit (varies widely) | often roughly $250–$800+ |

Costs vary widely based on roof size, pitch, number of layers, decking condition, material choice, access, and permit requirements. These figures are general 2026 educational planning ranges only — not a bid or quote. Every roof is different. Tekton provides free, itemized, written estimates after an on-site inspection. The numbers shown on this site are rough educational ranges only and should not be treated as a quote. The only accurate price is an itemized written estimate after we inspect your roof. Call 866-643-1950.

## A flat roof is a drainage and membrane problem

Low-slope roofs in Southern California fail in a short list of ways: ponding that never drains, seams that have opened in the UV, cap sheets that have alligatored, and flashings at walls, HVAC curbs, and penetrations that have split. The leak often shows up at a ceiling far from the failed seam because water travels under the membrane.

Tekton inspects the field, the drains and scuppers, the parapets, and the equipment curbs. You get a written scope: repair a seam, recover a still-serviceable assembly, or replace the membrane. We do not treat every stained ceiling as a full tear-off. Licensed as Tekton Builders & Design, CSLB #1113385. Call 866-643-1950.

## Homes, duplexes, apartments, and small commercial — one crew

A large share of Los Angeles County housing is not a simple pitched ranch. Long Beach, West Hollywood, East Los Angeles, and many Valley and Westside streets mix a steep shingle or tile slope with a flat over the addition, the garage, or the rear units. Small apartment buildings and commercial roofs are membrane jobs from the start.

We replace both systems when the building has both, instead of handing the low-slope section to a second contractor. That is the point of calling one licensed company.

## Systems we install on low-slope roofs

The right membrane depends on the deck, the drainage, occupancy, and the permit path. We specify the assembly on the estimate rather than a brand-name flyer.

- TPO and other single-ply membranes, including white cool-roof sheets when Title 24 or the heat load calls for them
- Modified bitumen and similar built-up or cap-sheet systems where that is the honest match for the existing roof
- Flashings at walls, parapets, HVAC curbs, pipes, and skylights — the details that actually leak
- Drainage: drains, scuppers, and crickets so water leaves the roof instead of sitting on it
- Tapered insulation or decking repair when ponding is a structure problem, not a coating problem
- Tear-off versus recover: we follow code and the condition of what is already there, and we write that choice down
- Permit and inspection where the city requires them
- Coordination with a steep-slope reroof on the same building when both are in the same project

## Title 24 cool roofs on low-slope replacements

Low-slope reroofs in much of Southern California have their own Title 24 cool-roof path: aged solar reflectance and thermal emittance on the membrane, not a steep-slope shingle rating. A white TPO or other CRRC-rated sheet is often the compliant, practical choice on a sun-baked addition or commercial roof.

We specify the compliant product on the estimate so the inspector, and you, can see it. Cool membranes reduce heat gain at the roof; they do not replace attic or ceiling insulation on the rooms below. If those rooms never cool down, ask us to look at both.

## 2026 educational planning ranges for flat and low-slope reroofs

Low-slope membranes are commonly discussed around $12–$28+ per square foot of roof as a planning figure only. Access, parapet height, how many penetrations and HVAC curbs must be flashed, whether the old membrane comes off, and whether the deck or taper has to be rebuilt all move the number. A small residential addition is a different job from a multi-unit or commercial field.

Costs vary widely based on roof size, pitch, number of layers, decking condition, material choice, access, and permit requirements. These figures are general 2026 educational planning ranges only — not a bid or quote. Every roof is different. Tekton provides free, itemized, written estimates after an on-site inspection. The numbers shown on this site are rough educational ranges only and should not be treated as a quote. The only accurate price is an itemized written estimate after we inspect your roof.

## Schedule, crew, and who you are hiring

Low-slope replacements usually take longer than a comparable shingle reroof because of detailing at walls and equipment. We agree on a start date, keep the building weathertight as work proceeds, haul debris, and walk the finished roof with you — including drains. Family-owned for 15+ years. Verify CSLB #1113385. Call 866-643-1950.

## Related services

- [Roof repair](https://southern-california-roofing.company/roof-repair)
- [Roof replacement](https://southern-california-roofing.company/roof-replacement)
- [Storm damage & insurance claims](https://southern-california-roofing.company/storm-damage-insurance-claims)

## FAQ

### How much does a flat roof replacement cost in Southern California in 2026?

Low-slope membranes are commonly discussed around $12–$28+ per square foot of roof as a planning figure only. A small residential addition is a different price than a duplex, apartment building, or commercial field. Costs vary widely based on roof size, pitch, number of layers, decking condition, material choice, access, and permit requirements. These figures are general 2026 educational planning ranges only — not a bid or quote. Every roof is different. Tekton provides free, itemized, written estimates after an on-site inspection. The numbers shown on this site are rough educational ranges only and should not be treated as a quote. The only accurate price is an itemized written estimate after we inspect your roof. Call 866-643-1950.

### Can you replace just the flat section of a house that also has shingles or tile?

Yes. We replace the low-slope membrane and, when it is due, the steep-slope system on the same building under one license and one estimate. Call 866-643-1950 with the address.

### Do I need a white cool roof on a flat replacement?

On many low-slope reroofs in Southern California, Title 24 requires a CRRC-rated cool membrane. We specify a compliant product when the permit path requires it. Limited repairs are a different conversation.

### Will you fix ponding or only put a new sheet over it?

Ponding that sits after a rain is a drainage or deck-slope problem. A new membrane over a bathtub fails the same way. We look at drains, scuppers, and whether taper or decking work belongs on the estimate before we quote a sheet.

## Contact

Call [866-643-1950](tel:+18666431950) or request an estimate at https://southern-california-roofing.company/free-quote.