
Hardscaping, Landscaping & Concrete Services in Longmont, CO
Six services, one crew, one point of contact. Whether you're starting with a bare lot or fixing a sloped yard you've never been able to use, we handle the whole thing in-house.
Behind Our Services
GM Outdoor Hardscape LLC is a family-owned hardscape and landscape contractor based in Longmont, Colorado. We build paver patios, retaining walls, concrete driveways, full landscape installations, and irrigation
systems for homeowners across Longmont, Boulder, Niwot, Erie, Berthoud, and Johnstown.
Every project starts with a free on-site estimate and a written, itemized proposal, so you know exactly what you're paying for before we break ground.
1
Paver Patios & Outdoor Living Spaces
Hardscaping is the permanent, built structure of your yard the patio you eat dinner on, the walkway to the front door, the seat wall around the fire pit. It's the part of the landscape that doesn't need mowing and doesn't die in
August.
This is the work we're most passionate about and the work we're growing into. A well-built paver patio turns
unused grass into the room your house was missing, and it does it without the cracking that plagues poured slabs
through Colorado freeze-thaw cycles.
We install paver patios, walkways, driveways, seat walls, steps, fire pits, and outdoor kitchens across Longmont
and Boulder County sized and laid out around how your family actually uses the yard.
WHAT'S INCLUDED:
• On-site design consultation and material selection (paver style, color, pattern, border)
• Full excavation and haul-off of existing material
• Engineered base: 6–12 inches of compacted road base, sized to the load the surface will carry
• Geotextile fabric and proper grading for positive drainage away from the foundation
• Bedding sand layer, screed, and mechanical compaction
• Paver installation with cut edges, edge restraint, and polymeric joint sand
• Seat walls, steps, fire pits, and lighting integration where specified
• Full site cleanup and a walkthrough before we call it done



2
Retaining Walls That Actually Hold
If part of your yard is a slope you can't use, a retaining wall is how you get it back. Walls carve flat, usable space
out of grade, stop soil from washing toward your foundation, and turn an awkward hillside into terraced planting
beds or a level patio pad.
A retaining wall is also the single easiest thing in a landscape to build wrong. Walls fail from the back from water
pressure and inadequate base long before anything shows on the face. We build with drainage aggregate,
perforated drain pipe, proper batter, and geogrid reinforcement where the height calls for it.
We install segmental block walls, natural boulder walls, and seat-height garden walls throughout Longmont, Niwot,
Erie, and Boulder.
WHAT'S INCLUDED
• Site evaluation, grade assessment, and drainage plan
• Excavation and compacted, leveling base course below finished grade
• Block, boulder, or natural stone selection to match the home
• Drainage aggregate backfill and perforated drain pipe behind the wall
• Geogrid soil reinforcement on taller walls where engineering requires it
• Capstones, adhesive, and finished edge detailing
• Backfill, regrading, and restoration of the surrounding area
• Coordination with engineering or permitting on walls above code height



3
Concrete Driveways, Slabs & Flatwork
Concrete is still the right answer for driveways, garage aprons, shed pads, sidewalks, and steps. It handles vehicle
loads that pavers can't, it's cost-effective over large areas, and done properly it lasts decades.
“Done properly” is doing a lot of work in that sentence. Colorado's freeze-thaw cycle and expansive clay soils
punish concrete that was poured on an unprepared base, finished too wet, or laid without correct control joints. We
prep, pour, and finish to hold up to Longmont winters.
We pour driveways, patios, walkways, sidewalks, steps, and equipment pads across Longmont, Erie, Johnstown,
and the surrounding communities.
WHAT'S INCLUDED
• Demolition and haul-off of existing concrete where required
• Excavation, subgrade preparation, and compacted base
• Forming, grading for drainage, and reinforcement (rebar or mesh as specified)
• Correct mix specification for Colorado exposure conditions
• Placement, screeding, floating, and finishing (broom, smooth, or exposed aggregate)
• Properly spaced control joints, cut on schedule to direct where cracking goes
• Curing guidance and clear instructions on when to walk and drive on it
• Site cleanup and form removal



4
Landscape Installation
This is the green side of the yard sod, grading, planting beds, trees and shrubs, mulch, rock, and edging.
Whether you've just closed on new construction with a dirt lot, or you're tearing out a tired yard that hasn't been
touched in fifteen years, we install the whole thing.
Landscape installation in Colorado is mostly about two things done early: grading and plant selection. Grade
wrong and you'll be fighting standing water and a wet basement forever. Choose plants that don't suit our altitude,
sun, and water restrictions and you'll be replacing them in two seasons.
We install complete landscapes for homeowners in Longmont, Boulder, Niwot, Erie, Berthoud, and Johnstown
typically alongside the hardscape and irrigation so the whole yard goes in as one coordinated project.
WHAT'S INCLUDED
• Site grading and drainage correction away from the foundation
• Soil preparation, amendment, and tilling
• Sod installation or seeding, with watering instructions
• Tree, shrub, and perennial selection and planting suited to the Front Range climate
• Planting bed shaping, edging (steel, paver, or natural), and weed barrier
• Mulch, decorative rock, cobble, and boulder placement
• Xeriscape and low-water design options for water-restricted areas
• Coordination with irrigation so zones match the planting plan



5
Irrigation & Sprinkler Systems
In Colorado, irrigation isn't optional it's the difference between a landscape that survives and one you replace.
But an inefficient system also quietly wastes hundreds of gallons a week and shows up on your water bill all
summer.
We install new sprinkler and drip systems, repair and reroute existing ones, adjust and replace heads,
troubleshoot valves and controllers, and handle seasonal startups and winter blowouts.
Systems are zoned around what's actually planted turf, beds, and trees have different water needs, and putting
them on the same zone means something is always getting too much or too little.
WHAT'S INCLUDED
• System design and zoning matched to the planting plan and available water pressure
• Trenching, mainline and lateral installation, and head placement for full coverage
• Drip irrigation for beds, trees, and low-water plantings• Valve boxes, backflow prevention, and controller installation
• Smart and programmable controller setup with seasonal schedules
• Repairs: broken heads, cracked lines, stuck valves, controller faults, coverage gaps
• Spring startup, pressure test, and head-by-head adjustment
• Fall winterization and compressed-air blowout



6
Seasonal Services & Property Care
A yard we build is an investment, and seasonal care is what protects it. We handle spring and fall cleanups,
aeration, mulch refreshes, bed maintenance, and cold-weather prep for properties across Longmont and Boulder
County.
Spring cleanup gets the yard out of winter debris cleared, beds redefined, mulch refreshed, irrigation started,
and turf aerated so it can actually take up water and fertilizer.
Fall cleanup protects everything through the cold leaves off the turf before they mat and kill it, perennials cut
back, beds prepped, and the irrigation system blown out before the first hard freeze.
WHAT'S INCLUDED
• Spring: debris and leaf removal, bed cleanup and redefinition, mulch refresh
• Spring: core aeration and irrigation startup with head adjustment
• Summer: bed weeding, mulch top-up, and pruning as needed
• Fall: leaf removal, perennial cutback, and bed winter prep
• Fall: core aeration, overseeding, and irrigation blowout
• Winter: snow and ice management for driveways and walks



Local Means Local
Our shop is on Meadow Street in Longmont, and most of our work is within about a 30-minute drive of it. That's
deliberate. Staying local means we know the soil conditions, the freeze patterns, and the permitting requirements
in the towns we serve and it means we can come back quickly if you ever need us.
Longmont is where we live and where most of our projects are. From the older neighborhoods near Old
Town with mature trees and tired 1970s concrete, to the new builds on the east side that come with bare dirt
lots and no landscaping at all, we've worked both ends of this city. Paver patios, retaining walls, concrete
driveways, full landscape installs, and irrigation all of it, all over Longmont.
Longmont, CO: Our Home Base
Boulder properties bring their own challenges: steeper lots, tighter access, and a real emphasis on
water-wise landscaping. We build terraced retaining walls that turn unusable slope into flat, usable yard, and we design low-water plantings and drip irrigation that hold up under watering restrictions.
Boulder, CO
Niwot's larger lots and semi-rural character suit natural boulder walls, flagstone, and generous outdoor living
spaces. We build patios and walls that look like they belong on the property rather than like they were
dropped there matching stone and scale to the setting.
Niwot, CO
Erie has grown fast, and a lot of that growth is new construction handed over with a graded dirt lot and
nothing else. That's our sweet spot: full landscape installation from scratch grading, irrigation, sod, beds,
and a patio delivered as one coordinated project instead of four separate contractors.
Erie, CO
Berthoud's larger properties and open exposure call for durable, low-maintenance work boulder walls,
rock and gravel areas, wind-tolerant plantings, and hardscape that stands up to weather without constant
upkeep.
Berthoud, CO
We serve Johnstown and the surrounding Weld County communities with the full range concrete
driveways and flatwork, paver patios, retaining walls, and complete landscape installations for both new
builds and established properties.
