ADU Design in Herndon, VA
Herndon sits in the heart of the Dulles technology corridor — data centers, defense contractors, and tech campuses near Dulles International — with Silver Line transit-oriented development reshaping its downtown and office core.
49 states · 10+ PEs · Same-day quotes on qualifying scopes · Zero excuses
ADU plans, start to permit
Site plan, floor plans, elevations, structural design, and energy compliance — the complete drawing set your city needs to approve an accessory dwelling unit.
Designed for ADU rules
Many states now streamline ADU approvals with state-level rules on size, setbacks, and fees. We design to the current rules in your jurisdiction so nothing gets kicked back.
Fast and affordable
ADUs are small projects — they shouldn't carry big-firm fees or timelines. Lean process, best price, quotes back fast.
Project types
- Data center & mission critical
- Tech office & defense
- Mixed-use transit-oriented
- Corporate headquarters
- Multifamily residential
- Light industrial & flex
Everything else your project needs
MEP Engineering in Herndon
Mechanical, electrical & plumbing design — permit-ready drawings, best price.
Structural Engineering in Herndon
Structural design, analysis & PE stamping — permit-ready drawings, best price.
Civil Engineering in Herndon
Site civil & land development — permit-ready drawings, best price.
Electrical Engineering in Herndon
Power distribution, panels & lighting design — permit-ready drawings, best price.
Plumbing Engineering in Herndon
Water, sewer, gas & fixture design — permit-ready drawings, best price.
HVAC Engineering in Herndon
Heating, cooling, ventilation & ductwork — permit-ready drawings, best price.
PE Stamping in Herndon
Licensed PE stamps on your plans — fast turnaround, best price.
Structural Stamping in Herndon
Licensed PE stamps on structural plans & calculations — fast turnaround, best price.
MEP Stamping in Herndon
Licensed PE stamps on MEP plan sets — fast turnaround, best price.
Civil Stamping in Herndon
Licensed PE stamps on civil & site plans — fast turnaround, best price.
Fire Protection Engineering in Herndon
Fire sprinkler, alarm & suppression design — permit-ready drawings, best price.
Plan Check Corrections in Herndon
Plan check comments answered fast — resubmittal-ready corrections, best price.
Energy Modeling & Compliance in Herndon
Title 24, COMcheck & ASHRAE 90.1 compliance — pass plan check, best price.
Tenant Improvement Engineering in Herndon
TI engineering for office, retail & restaurant buildouts — permit-ready, best price.
Low Voltage Engineering in Herndon
Fire alarm, data, security & AV design — permit-ready drawings, best price.
Seismic Retrofit Engineering in Herndon
Earthquake retrofit design & PE-stamped plans — best price.
Solar Engineering in Herndon
PV structural analysis, NEC 690 electrical design & interconnection — permit-ready drawings, best price.
Fire Alarm Engineering in Herndon
NFPA 72 fire alarm design, voice evacuation & mass notification — permit-ready drawings, best price.
Security System Engineering in Herndon
Access control, video surveillance & intrusion detection design — permit-ready drawings, best price.
Building Automation Engineering in Herndon
BACnet controls, BMS design & smart building integration — permit-ready drawings, best price.
Elevator Engineering in Herndon
ASME A17.1 elevator design, modernization & code compliance — permit-ready drawings, best price.
Industrial Electrical Engineering in Herndon
NEC Article 430 industrial power design, arc flash & hazardous locations — permit-ready drawings, best price.
Plumbing Design Engineering in Herndon
IPC/UPC plumbing design, medical gas & backflow engineering — permit-ready drawings, best price.
HVAC Retrofit Engineering in Herndon
HVAC retrofits, electrification & decarbonization design — PE-stamped mechanical plans, best price.
Electrical Panel Upgrade Engineering in Herndon
Panel upgrades, load calculations & utility coordination — permit-ready drawings, best price.
Emergency Power Engineering in Herndon
Generators, NFPA 110 systems & life-safety power design — permit-ready drawings, best price.
Renewable Energy Engineering in Herndon
Wind, geothermal & hybrid renewable engineering — feasibility, PE-stamped design & interconnection, best price.
Energy Audit Engineering in Herndon
ASHRAE Level 1/2/3 energy audits, benchmarking & retro-commissioning — find the waste, prove the savings, best price.
EV Charging Engineering in Herndon
EV charging station design — NEC 625, load calculations & service upgrades, permit-ready drawings, best price.
Water Treatment Engineering in Herndon
Filtration, disinfection, reverse osmosis & backflow design — permit-ready water engineering, best price.
Battery Storage Engineering in Herndon
Battery storage design per NEC 706 & NFPA 855 — permit-ready drawings, best price.
Commissioning Engineering in Herndon
Building commissioning & functional testing — systems verified to work as designed, best price.
Data Center Engineering in Herndon
Mission-critical MEP for data centers — Tier III/IV electrical, cooling & fire protection, best price.
Generator Engineering in Herndon
Standby generator sizing, ATS & emergency power design — permit-ready drawings, best price.
Lighting Design Engineering in Herndon
Photometric lighting design, controls & code compliance — permit-ready drawings, best price.
Medical Facility Engineering in Herndon
Medical gas, exam-room HVAC & healthcare electrical design — permit-ready drawings, best price.
Commercial Kitchen Engineering in Herndon
Commercial kitchen hoods, grease exhaust, gas & interceptors — permit-ready drawings, best price.
Pool Engineering in Herndon
Pool structural, systems & permits — engineered for plan check approval.
Engineering Cost Guide in Herndon
Straight answers on what engineering really costs.
ADU Design nearby
Alexandria · Arlington · Ashburn · Blacksburg · Bristol · Centreville · Charlottesville · Chesapeake · Dale City · Danville · Fredericksburg · Hampton