New siding on your Longmont, CO property is a 20-to-40-year investment. The product matters. The installation matters more. Our Longmont-based crews hold manufacturer certification on the major panel systems and follow the installation guides that keep material warranties intact from day one.

Not every crew offering Siding Installation in Longmont, CO has the credentials and documented track record to back the claim. Here's what separates our team from the field.
Manufacturer-certified crews on vinyl, fiber cement, engineered wood, and steel. Certification isn't cosmetic — it's what keeps the 30-year material warranty in force after we leave.
Every project starts with a no-cost on-site measure covering all wall planes, penetrations, and substrate conditions — the foundation of an estimate you can actually count on.
Materials, labor, housewrap, trim, permit — every component listed separately so you know exactly what you're paying for before signing.
A signed document specifying coverage period and resolution process. Not a verbal promise — a warranty you can file and enforce.
We don't farm out subservice work. Every Siding Installation project in Longmont, CO is assigned to a technician with documented experience on that specific scope.
Complete demo of existing cladding, substrate inspection, housewrap replacement, and full installation of your chosen cladding system. Every trim piece — corner posts, J-channel, fascia wrap, soffit — included in scope, not an add-on.

We work directly from architectural drawings, coordinate with framing crews, and sequence the installation window to hit the building's timeline. Material staged under cover on-site, moisture-checked before cutting begins.

The starter strip and all penetration flashing are where most moisture problems originate. We treat these as primary scope — self-adhering membrane at rough openings, step flashing at wall-roof junctions, and pan flashing at horizontal transitions.

Every installation includes a correctly lapped, seam-taped housewrap integrated with window flanges and sealed at all penetrations — the step that separates a weather-tight wall from one that looks fine for two years then fails.

When over-cladding is viable, we use a furring-strip drainage plane system rather than fastening directly to existing siding. This maintains drainage and gives new panels a solid, correctly elevated nailing surface.

Vented or solid vinyl soffit, aluminum-wrapped or fiber cement fascia, and all accessory trim installed as a complete system so every component carries the same warranty start date.

A clear, predictable process reduces stress and produces better results. Here's exactly what happens when you call our Longmont, CO Siding Installation team.
We schedule within 24–48 hours, arrive with measuring tools and a moisture meter, document all wall planes and existing substrate conditions, and note any issues before building the estimate.
Every component — panels, trim, housewrap, labor, permit — listed separately. Delivered within 24 hours of the site visit. The estimate is the contract.
Material ordered to exact spec, staged on-site the day before start. Permit pulled where required. Crew assignment and start date confirmed in writing before ordering anything.
Installation proceeds in sequence — housewrap first, flashing second, panels third, trim last. Final walkthrough by elevation, manufacturer warranty registration in your name, and written workmanship warranty delivered at project close.
The measurement visit was more thorough than I expected — they probed the sheathing at three points and found elevated moisture behind our west wall before we'd agreed on anything. That honesty upfront told me everything about how the project would go.
Fiber cement with factory ColorPlus — the installer back-primed every field cut on-site before anything went on the wall. That's the kind of practice you only see from crews who actually understand the product.
Started on Monday, finished by Thursday. Site was clean every evening, and the final walkthrough covered every elevation in detail. The warranty document was in my hands before they loaded the last tool.
The lead installer caught a section of missing blocking behind the corner post location on the east wall. Fixed before any siding went on. That kind of proactive catch is what certified experience looks like.
Forge Siding provides Siding Installation across the full Longmont, CO service area. We're familiar with local building codes, permit requirements, and contractor licensing standards throughout CO — no learning curve on your project.
Serving zip codes including: 80501 80503 80504
Our Longmont, CO installation team books free measurement visits within 24–48 hours. Call now for a written line-item estimate and a confirmed start date.
📞 Call Forge Siding Now