A patched head will not save a yard that never had a real layout. Hose watering and mismatched nozzles leave dry corners on San Diego lawns. A new inground sprinkler system needs a written scope, not another weekend of guesswork.
When a new system is the right conversation
What is a sprinkler system?
A lawn sprinkler system is a buried water network. A backflow device sits on the potable tap. A controller opens valves in sequence. Each valve feeds one zone of pipe and heads. The heads pop up, throw a matched pattern, and drop. Hoses and oscillating spikes are not a system.
New install is the right talk when there is no working layout to salvage. Bare dirt after a North Park remodel needs pipe. A 1970s grid that never separated lawn, slope, and beds needs a new map. Those jobs are not sprinkler and irrigation repair. Repair keeps a designed system alive. A new install designs the coverage first.
Replacement sits in the middle. If the valves, clock, and laterals still match the planting, you may be in replace a lawn sprinkler system territory. That path swaps failed parts on the same map. If the map is wrong for the yard you have now, start over on paper.
San Diego County is not one watering climate. A bermuda parkway in Chula Vista bakes on a south wall. A fescue strip in Encinitas sits under marine layer all morning. East County clay in El Cajon and Lakeside holds water, then cracks. Coastal sand in Imperial Beach drains fast. A new system has to zone those differences.
City of San Diego Public Utilities locks outdoor watering to before 10:00 a.m. or after 6:00 p.m. It also bans irrigation during rain and for 48 hours after measurable rainfall. That rule is year-round inside the City’s service area. Helix, Otay, Olivenhain, and Vista Irrigation District set their own rules. Confirm yours with the agency on the water bill before anyone programs a clock.
If dry spots and one dead head are the whole problem, stay in repair. If the yard never had even coverage, or the planting plan changed, you need a new scope.
What a written install scope should name
Ask for a measured plan, not a handshake. A useful sprinkler system installation scope names the water source. It names static pressure and flow if they were tested. It names pipe size and material, valve count, and a zone list. It names head model and nozzle, controller make, and the backflow assembly your water agency will accept. It names trench restoration. It names what is excluded.
The plan should show the house, driveway, sidewalks, trees, slopes, and meters. Lawn gets head-to-head coverage. Mixed beds get drip or micro-spray called out by name. Parkways, side yards, and the strip in front of a Normal Heights bungalow get their own zones when pressure or plant type differs.
Exclusions matter as much as inclusions. Hardscape cuts. Tree-root reroutes. A meter upgrade the water agency has to approve. Low-voltage wire through a finished wall. If it is not on the page, it is not in the job. The contractor you hire confirms the price with you before work starts. Bloom Pro SD does not set that price. We match you with a licensed independent pro. You contract with that pro directly.
The scope should say who pulls any required permit. It should say who schedules a backflow test. It should say who calls for utility locates. That work belongs to the matched contractor. We do not pull permits. We do not trench.
When you choose a sprinkler system contractor, compare those written lists. Two bids that only say “install irrigation” are not comparable. One may skip the backflow the City of San Diego or Otay Water District will later require. The other may leave the parkway on the same zone as a shady north bed.
Parts quality belongs on the page too. Valve brand. Swing joints versus cheap tubing. A weather-based or WaterSense-labeled controller. Whether existing hose bibs stay. Do not accept “standard heads” as a specification.
How zones, heads, and controllers get planned
Zones exist because one line cannot water the whole yard at once. Flow, pressure, plant type, and sun all change the map.
How many sprinklers can you run off one line?
Flow at the meter, in gallons per minute, and pressure, in pounds per square inch, cap how many heads can open together. Friction in pipe steals more. So does elevation on a La Mesa hillside. Every elbow steals a little too. There is no universal heads-per-line number. Anyone who quotes one without measuring your meter is guessing.
The contractor should test the outside faucet or the irrigation tap. Then they size zones so each head on a zone matches precipitation rate. Mixing a high-volume rotor with a spray on the same valve soaks one strip and starves the other. Lawn, shrubs, and slope get separate valves. Morning sun on a west-facing Escondido wall is not the same job as a foggy Carlsbad side yard.
What is the recommended spacing for lawn sprinkler heads?
Lawn sprays and rotors are laid out for head-to-head coverage. Each head throws to the next head so the patterns overlap. Exact feet depend on the nozzle, the pressure at that head, and wind. A coastal lot in Del Mar does not use the same throw as a wide inland lawn in Poway. The plan should list nozzle type and radius, not a doodle of dots. Heads sit at finished grade. Too high and a mower clips them. Too low and turf buries them.
Warm-season grasses such as bermuda and zoysia need about 25% less water than cool-season fescue. That figure comes from UC Master Gardener guidance for San Diego County. If the front lawn is bermuda and the parkway is leftover fescue, they should not share a zone.
The controller is the practical brain. Inside the City of San Diego, it has to follow the 10:00 a.m. and 6:00 p.m. window, rain delay, and no-runoff rule. A weather-based controller can follow local weather instead of a fixed calendar. SoCal Water$mart rebates start at $80 per controller for landscapes under 1 acre, or $35 per station for landscapes over 1 acre. Eligible devices are rebated only for active stations on an in-use irrigation system. Amounts vary by water agency and funding. Check your address on socalwatersmart.com before you assume a number. EPA WaterSense lists labeled irrigation controllers.
Drip belongs on the same clock when the yard mixes lawn and beds. Overhead spray on mixed planting wastes water and stains fences. The scope should say which valves are spray, which are drip, and which old heads get capped.
Which permit and backflow questions to confirm
Backflow protection keeps irrigation water out of the drinking supply. The water agency, not a national blog, names the approved assembly, the install height, and whether a certified tester must file a report after the job. City of San Diego Public Utilities, Helix Water District, Otay Water District, and the smaller north county agencies do not publish one shared rule in our claims ledger. Call the agency on your bill and ask three things. What device is approved for a residential irrigation connection. Whether a permit or inspection is required. Who is allowed to test it.
Building and plumbing permits for a new lawn sprinkler system are also local. We could not confirm a single countywide square-footage trigger, or a flat always-required rule, that covers every city in San Diego County. Ask the counter that has jurisdiction over the lot. That may be City of San Diego Development Services, the County of San Diego for unincorporated land, or city hall in Chula Vista, Oceanside, Escondido, and the rest. If the landscape is new or rebuilt and large enough to fall under the Model Water Efficient Landscape Ordinance (MWELO), the city or water district may also ask for a water budget. Specific MWELO size thresholds were not confirmed in our ledger, so do not treat a blog number as the law. Ask the planning or water-efficiency desk for the current trigger.
California landscaping work with an aggregate contract price of $1,000 or more generally requires a licensed contractor under Business and Professions Code section 7048, as amended effective January 1, 2026. The casual, minor exemption is narrow. A full inground sprinkler system is not a small hose-end kit. Look up the pro on the CSLB license check. C-27 landscape contractors may construct, maintain, repair, or install landscaping. Confirm classification, status, bond, and workers’ compensation on that page. The pros we connect you with are licensed and insured. We are a referral service. We hold no contractor license.
Before trenches open, buried gas, electric, water, and communications lines need locates. The national 811 locate service is how contractors request those marks. Ask the matched pro who places that call and how they hand-dig near the marks. Do not treat a painted stripe as the exact pipe.
City of San Diego also requires that potable irrigation not run onto sidewalks, streets, or the neighbor’s lot. Leaks must be stopped within 72 hours of discovery or city notice. A new layout that oversprays a Clairemont driveway is already out of step with that rule.
What to share before requesting a contractor match
Send the facts that let a C-27 design the system. City and ZIP. Water agency on the bill. Lot size, and what is lawn, bed, slope, and hardscape. Photos of the meter, the backflow if one exists, the current clock, and the dry or flooded spots. HOA irrigation rules if you have them. Whether sod, natives, or a mixed yard is going in. Whether you are on City of San Diego watering hours or another district.
If you already measured static pressure at an outside faucet, include it. If you did not, say so. The contractor should still verify flow and pressure on site. Note big trees, a retaining wall, a coastal bluff setback in Encinitas, or defensible space around a Ramona structure. Those change trench routes.
Is it easy to install a sprinkler system in a yard?
A kit at a home center makes the piping look simple. A San Diego install is not simple. You are tapping potable water, setting a backflow device the agency will accept, trenching around utilities, matching precipitation rates, wiring a controller, and restoring turf on clay or sand. That is licensed landscape work on a typical full-yard job, not a casual weekend. If you only need a head, a valve, or a leak found, that is repair. Our notes on sprinkler repair cost in San Diego cover that path.
Bloom Pro SD answers the line, takes those details, and matches you with a licensed independent landscaping contractor. The homeowner contracts with and pays that contractor. We do not own trenches, trucks, or a parts warehouse.
Bring the written scope list from this page to the conversation. Ask the pro to mark zones, heads, controller, backflow, permits, locates, and exclusions before anyone cuts a trench.
When to call us
A new inground sprinkler system needs a licensed landscaping contractor when you are past hose watering and patch repairs, and you want a scoped layout for your San Diego County lot. Call us at (760) 400-6355 and we’ll match you with a licensed local pro.