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Landscape & Architectural Lighting
Outdoor Lighting Installation in Northern Virginia
Low-voltage LED landscape lighting, architectural uplighting, and path lighting designed and installed by licensed electricians — so your home looks as good at 9pm as it does at 9am.
The Short Answer
A professionally installed low-voltage landscape lighting system for a typical Northern Virginia home runs $2,500–$7,500, with most projects landing near $3,500–$5,000 for 12–20 fixtures covering a front walkway, entry, and accent trees. Fixture-only pricing runs roughly $100–$200 installed per light depending on type (path, uplight, or wash) and wire-run distance. Because these systems run on 12-volt transformers, most residential installs in Fairfax, Loudoun, Prince William, Arlington, and Alexandria are exempt from a building permit — we still pull one whenever a project ties into house power or a irrigation-timer panel, per current Virginia electrical code. Most installs are designed, wired, and lit up in a single day.
A Complete Lighting System, Not Just Fixtures in the Dirt
Every Lawn Theory lighting install is engineered as a system — transformer sizing, wire gauge, fixture placement, and beam angles are all planned before a single light goes in the ground.
- Free on-site design walk. We map fixture placement and wire runs against your architecture and plantings.
- Commercial-grade LED fixtures. Brass and copper housings built to last 15+ years outdoors.
- Direct-burial, gel-filled wire connections rated for underground use, not electrical-tape splices.
- Multi-tap transformer sizing so every fixture gets full, even voltage — no dim lights at the end of the run.
- Smart timer or app control with dusk-to-dawn photocell options.
- Nighttime walkthrough & fine-tuning after dark, before we call the job done.
How We Work
From Walk-Through to Lights On, In Three Steps
Consultation
We walk your property at dusk to see how your home and landscape actually read after dark, then map out fixture zones and priorities.
Proposal
You get a fixture-by-fixture lighting plan with transformer sizing and a firm price — no vague "lighting package" line items.
Implementation
Our electricians trench, wire, and aim every fixture, then return after dark for a final walkthrough and beam-angle adjustment.
Local Knowledge
Built for Northern Virginia Properties and Codes
- Most low-voltage systems skip the permit process. Fixtures and wiring running on 12-volt transformers (50V max) are generally exempt from a building permit under Fairfax, Loudoun, Prince William, and Arlington electrical codes. Any tie-in to your home's 120V panel still gets a proper electrical permit pulled in our name.
- HOA and dark-sky rules vary by community. Loudoun County's zoning ordinance requires exterior lighting to be full-cutoff and shielded so it doesn't spill onto neighboring lots — many Ashburn, Leesburg, and South Riding HOAs mirror this with their own fixture-height and glare limits. We aim every fixture to stay compliant.
- Clay-heavy soil changes the install method. Northern Virginia's dense clay subsoil means we hand-trench or use a cable plow depending on root density near mature trees, protecting root systems in older neighborhoods like McLean and Old Town Alexandria.
- Typical turnaround is one to two days. A standard 12–20 fixture front-yard system is designed, trenched, wired, and aimed in a single working day for most Northern Virginia lots; larger whole-property systems with multiple transformers run two days.
Why Lawn Theory
The Difference Is In the Details
Design-First Approach
Every project starts with a lighting plan, not a fixture count — so beam angles, shadows, and glare are considered before install day.
Licensed Electricians
Transformer sizing and any 120V tie-ins are handled by licensed electricians, not a landscaping crew improvising wiring.
Commercial-Grade Fixtures
Brass and copper housings that resist corrosion, warranted well beyond the composite fixtures big-box installers use.
Night-Time Fine-Tuning
We come back after dark to adjust every fixture angle in person — lighting looks different at night than on a daytime punch-list.
Where We Build
Proudly Serving Five Northern Virginia Counties
Every county has its own dedicated Outdoor Lighting Installation page. Pick a county to see the areas we serve.
Serving Fairfax County
What Homeowners Say
Real Feedback From Real Northern Virginia Yards
"Our front walkway in McLean went from pitch dark to genuinely elegant. The crew came back after dark to adjust every single fixture angle — that level of care sold me."
"We got quotes from three companies for our Ashburn backyard. Lawn Theory was the only one that actually explained transformer sizing instead of just counting fixtures."
"Clean trenching around our old oak's root zone in Old Town, no dead spots in the lighting, and it was done in a single day. Exactly as promised."
Pairs Well With
Complete Your Outdoor Living Space
Frequently Asked Questions
Outdoor Lighting Installation, Answered
How much does outdoor lighting installation cost in Northern Virginia?
Most low-voltage landscape lighting projects run $2,500–$7,500, with a typical front-yard system of 12–20 fixtures landing around $3,500–$5,000 installed. Per-fixture pricing runs roughly $100–$200 depending on fixture type and wire-run length. Whole-property systems with multiple transformer zones can run $10,000 or more.
Do I need a permit for landscape lighting in Fairfax, Loudoun, or Prince William County?
Usually not. Low-voltage systems (50 volts or less) are generally exempt from building permits across Fairfax, Loudoun, Prince William, and Arlington counties. If your project ties into your home's 120V electrical panel or an existing irrigation control panel, we pull the appropriate electrical permit in our licensed contractor's name.
Will my HOA allow outdoor lighting installation?
Nearly always, but many Northern Virginia HOAs — especially in Loudoun communities like Ashburn and South Riding — require fixtures to be full-cutoff, shielded, and aimed downward to prevent glare onto neighboring properties, mirroring the county's own dark-sky provisions. We design every install to meet those standards from the start.
How long does an outdoor lighting installation take?
A standard 12–20 fixture system covering a front walkway, entry, and accent trees is typically designed, trenched, wired, and aimed in a single day. Larger whole-property systems with backyard entertaining areas or multiple transformer zones usually take one to two days.
What's the difference between low-voltage and line-voltage outdoor lighting?
Low-voltage systems run on a 12-volt transformer stepped down from household power, making them safer to install near plantings and generally permit-exempt. Line-voltage (120V) fixtures tie directly into house wiring, require a licensed electrician and often a permit, and are typically reserved for fixed architectural or security lighting rather than landscape accents.
Can outdoor lighting be added around mature trees without damaging roots?
Yes. In established neighborhoods like McLean, Vienna, and Old Town Alexandria, we hand-trench or use a cable plow depending on root density near mature trees, keeping wire runs shallow and away from major root systems so the landscape isn't disturbed.
Do you offer smart or app-controlled outdoor lighting?
Yes. Every system can be paired with a dusk-to-dawn photocell, a mechanical timer, or an app-based smart controller so your lighting turns on and off automatically and can be adjusted by zone from your phone.
Free Interactive Tool
Outdoor Lighting Designer
Pick your coverage scope for an instant installed-cost range.
Ready When You Are
Let's Light Up Your Northern Virginia Property
Get a free on-site design walk and a firm, fixture-by-fixture quote within 24 hours.