Phasing a Landscape Project Over Several Seasons

Why phase a landscape project at all?

Budget is the obvious reason. A complete landscape with grading, hardscape, irrigation, lawn and planting is a large investment, and phasing lets you pay for it over two to four seasons. There are practical reasons too. Some work is best done in spring, some in late summer or fall. Living with a space for a season shows you where people actually walk, where snow piles up and where the afternoon sun is too hot to sit.

Phasing also lets new construction settle. Around a new house, backfill settles for a while, and building a patio or planting beds on soil that is still moving invites problems.

Do you need a full design before starting?

Yes, and this is the most important rule of phasing. Without a plan for the finished yard, phase one gets built where it is convenient now and ends up in the way later: a patio poured where the drainage swale should go, sprinkler mains under a future wall, a tree planted where the driveway extension will be. A full design costs less than tearing out one phase.

The design does not have to be final in every detail. Plant choices can change; the locations of hard surfaces, grades, walls, irrigation mains and sleeves should not. Our guide to the landscape design process explains what a design includes.

What should go in phase one?

Everything that is hard to change later and everything that later phases sit on. That usually means rough grading and drainage, any retaining walls, utility and irrigation sleeves under future hard surfaces, the irrigation main line and valve locations, and major hardscape. Montana State University Extension recommends at least a 1 percent slope away from the house, about an inch every 8 feet, and getting that right first protects the foundation and everything built afterward.

Heavy equipment belongs in phase one. Once lawn and beds are in, every trip with a loader is a repair job. If a patio or wall is in the long-term plan, building it early, or at least doing its excavation and base, avoids driving over finished landscape later.

What can safely wait?

Plants, mulch, lighting fixtures, furniture and decorative features can all be added later without disturbing what is built, as long as the infrastructure for them is in. A bed can be graded, edged and mulched in phase one and planted in phase two. Landscape lighting can wait if conduit or wire runs were placed under hard surfaces in phase one. Trees are the exception: they take the longest to grow, so planting them early in the sequence pays off.

How do Montana's seasons shape the phases?

Spring, once the ground has thawed and dried enough to work without compacting it, is the main construction window, and it is the busiest time for crews. Summer is good for hardscape and irrigation, harder on new plants. Late summer and early fall are often the best planting and seeding window here. MSU Extension says lawns can be seeded in late April and May, but that seeding from mid-August to mid-September is better because annual weeds do not have time to set seed and the grass has fall and early spring to establish.

Frozen ground stops excavation and planting in winter, but winter is the best time to design, get quotes and book spring work. Our guides to frost dates, short growing season planning and fall planting help with timing, and the landscape maintenance calendar shows the year at a glance.

What does a typical three-phase plan look like?

Every property is different, but a common pattern is this. Phase one: grading, drainage, walls, irrigation main and sleeves, and the main patio or walkway, finished with a temporary cover such as mulch or seed on the disturbed ground. Phase two: irrigation zones and heads, lawn, trees and the main shrub beds. Phase three: perennials, finishing touches, lighting and any secondary features such as a fire pit or a second sitting area.

On a large rural property, phases are often organized by area instead: the area around the house first, including defensible space if you are in fire country, then the approach and entry, then outer areas. Our guide to landscaping a rural acreage covers that approach.

How should irrigation be phased?

Install the main line, the backflow assembly location and sleeves under hard surfaces in phase one, sized for the finished system, even if only some zones are built. Adding zones later is straightforward if the main and the controller have room for them; it is expensive if the main was sized for half the yard. Plan zones by plant need so lawn, beds and trees can be watered differently. Our guide to how irrigation zones should be laid out and our irrigation systems page explain the design.

The EPA WaterSense program recommends taking a whole-property approach when planning a water-smart landscape, which fits phasing well: decide the water plan once, then build it in stages.

What about soil in a phased project?

Test it before phase one. MSU Extension recommends testing soil every three to four years, and a test at the start tells you what amendments each area needs. MSU's lawn guide also says that when a grade has to change, the top 6 inches of soil should be stripped, the grade changed and the topsoil replaced, so stockpiling good topsoil during phase one saves buying it later. Cover stockpiles so they do not grow a crop of weeds before you use them.

Areas waiting for a later phase need protection too. Bare graded soil erodes and fills with weeds; a cover crop, a temporary seeding or a thick mulch keeps it in shape. Our soil testing guide covers sampling.

How do you avoid paying twice?

Build from the bottom up and from the back to the front. Finish work that needs equipment before laying lawn the equipment would cross. Put sleeves under every hard surface even if you are not sure you will need them. Keep a copy of the design and an as-built drawing of the irrigation and lighting so the next crew knows what is in the ground.

Also call in utility locates for each phase that involves digging. Montana law requires notice through the one-call center before excavation, and the locate request covers work starting within a limited window, so a phase two that starts a year later needs a new request. Montana811 notes that private lines may not be located, which makes your own as-built drawing even more valuable.

How do you keep a phased yard livable in between?

Finish each phase to a clean edge. A patio with a defined border, a graded and mulched bed waiting for plants, or a seeded area that will be lawn by next year all look intentional. Leave access routes for the next phase's equipment, ideally where a path or driveway will eventually go, so later work does not cross finished areas.

Can one contractor handle every phase?

It helps. A company that built phase one knows where the sleeves, valves and wires are, and can price phase two against what is actually there. If you change contractors between phases, give the new one the design and the as-built notes. Our guide to choosing a landscaping company covers what to look for, and our cost factors guide explains where the budget goes.

How we phase projects

We design the finished landscape first, then price it in phases with the infrastructure up front, as part of our landscaping design and installation service. Because we handle grading, hardscaping, irrigation, planting and lawn ourselves, each phase builds on the last without a handoff between trades. Estimates are free across Missoula and the Bitterroot Valley. For more planning guides, see the Montana Landscaping, Lawn & Irrigation Guide.

Call HJ Property Care & Tree Service at (406) 215-7319 or request a free estimate and we will walk the property with you and put the scope in writing.

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