How to Landscape Around Your House Without Foundation Problems

How Much Should Soil Slope Away From Your House?

Soil should drop at least 6 inches over the first 10 feet away from the foundation, which is about a 5% slope and the standard most US residential building codes use. If the ground next to your house is flat or, worse, sloped toward the wall, every rain sends water straight to the foundation instead of away from it.

Over time that water can pool against the footing, seep into a basement or crawl space, and put pressure on foundation walls that eventually shows up as cracks. It's one of the most common, and most avoidable, problems with landscaping around a house.

You don't need survey equipment to check your grade. Run a hose near the foundation for a few minutes and watch where the water actually goes. If it sits or creeps back toward the house, fix the grading before you add beds, mulch or plants on top of it.

How Far From the House Should You Plant Shrubs?

Keep small shrubs and perennials 18-24 inches from the wall, and plan for 3-4 feet of clearance for larger shrubs like holly, boxwood or hydrangea once they're fully grown. A foundation bed looks great the day it's installed, when everything is still small. The problem shows up two or three seasons later, once shrubs fill in and start touching the siding.

Branches and leaves pressed against a wall trap moisture, which can lead to wood rot, peeling paint, mold on siding, or a bridge that ants and other pests use to climb into the house. Check the plant tag's mature width, not the size of the pot, and set your spacing off the wall based on that number. Naturally compact low-maintenance shrubs make this much easier than plants you have to keep cutting back.

Also make sure nothing you plant will eventually grow over a foundation vent, dryer vent or window well. Those need to stay clear for airflow and drainage, not just for looks. For layouts that work within these setbacks, see these front yard landscaping ideas, including how to size a foundation planting bed.

Use the distances below as general rules of thumb. Local codes, your utility company and equipment manuals take priority where they differ.

Point Sprinklers and Downspouts Away From the House

A sprinkler head that's aimed even slightly wrong can spray the same few square feet of siding every time it runs, for months at a stretch. That kind of constant wetting is a common cause of wood rot, stained brick and premature paint failure near the ground.

When you're setting up or adjusting an irrigation system, make sure heads throw water outward, not against the wall, and keep the nearest spray pattern at least 2 feet off the foundation.

Downspouts cause the same problem on a bigger scale. A downspout that empties right at the foundation can dump hundreds of gallons in a single storm exactly where you don't want it. Add an extension or splash block that carries water at least 4-6 feet away from the house, and make sure your landscaping doesn't block that discharge path or redirect it back toward the wall.

Keep Mulch and Soil Below the Siding Line

Mulch is great for planting beds, but piling it, or soil, too high against the house creates the exact conditions termites and wood rot need: constant moisture and a hidden path straight to the sill plate.

For homes with stucco, soil and mulch should stay several inches below the weep screed, the metal strip near the base of the wall that's designed to let moisture drain out. For brick homes, keep grade below the weep holes in the mortar joints. For vinyl or wood siding, keep mulch and soil off the bottom edge of the siding entirely; siding manufacturers commonly call for about 6 inches of clearance.

Stick to 2-3 inches of mulch depth in beds near the house, and never build a raised bed directly against the foundation without a gap. If you want a raised bed near the house, leave a narrow gravel strip or air gap between the bed wall and the foundation so water and pests can't bridge the two.

How Close Can You Plant a Tree to Your House?

Plant large shade trees at least 15-20 feet from the foundation and your sewer lateral, and mid-size ornamental trees at least 10 feet away. Roots grow toward moisture and will travel a long way to find it, including into old sewer lines with cracked joints or a slightly leaky foundation.

Some fast-growing, aggressive-rooted species like willows or silver maples deserve even more distance, since their roots are notorious for finding and infiltrating older clay pipe. Once you've picked a spot, follow the steps for planting a tree at the right depth so it establishes well.

If you already have a large tree closer than that, watch for warning signs: slow drains, recurring sewer backups, or a walkway or patio slab that's started to lift or crack near the trunk. A plumber can run a camera down the line to check for root intrusion before it turns into a full excavation and pipe replacement.

Leave Clearance Around Utility Access Points

It's tempting to tuck a gas meter, electrical panel or AC condenser behind a nice row of shrubs, but utility companies and equipment manufacturers set clearance rules for a reason.

Many gas utilities want roughly 24-36 inches of clear space around a meter so it can be read and serviced without a technician wrestling through your landscaping. AC condenser units need roughly 24 inches of open space on all sides for proper airflow. Crowd one with plants and you can end up with a unit that runs less efficiently and wears out faster.

Dryer vents need to stay completely unobstructed. A vent partially buried by mulch or blocked by a shrub is a lint and fire hazard, not just an eyesore.

Slope Patios and Walkways Away From the House Too

Landscaping around your house isn't only about plants and mulch. Hardscape matters just as much, and it's easy to overlook because it looks solid and permanent.

A patio, walkway or driveway that's flat or pitched toward the house sends rainwater exactly where a good grading plan is trying to keep it away from: your foundation. This is especially common with patios added years after the house was built, where the new slab doesn't quite match the original grading.

New concrete or paver surfaces near the house should slope about 1/8 to 1/4 inch per foot away from the wall. If an existing patio slopes the wrong way, you don't necessarily need to tear it out. A French drain along the edge closest to the house, or regrading the base beneath a paver patio, can redirect water without a full replacement.