Most Chelmsford homeowners meet an electrician on the worst day of their month. We try to make that day boring: a clear arrival window, a flat price before we start, and the problem actually gone when we leave.
Each service below has its own Chelmsford page with local detail, pricing guidance and dispatch.
No power, sparks, burning smell
CKT 02100A to 200A service, breaker boxes
CKT 03Knob-and-tube and aluminium replacement
CKT 04Level 2 and Tesla Wall Connector
CKT 05Standby and whole house backup
CKT 06Recessed, outdoor, LED retrofit
CKT 07GFCI, USB, dedicated circuits
CKT 08New boxes, remotes, high ceilings
CKT 09Automation, structured wiring, hubs
CKT 10Offices, retail, restaurants, warehouse
CKT 11Troubleshooting and fault finding
CKT 12Panel-mounted surge protective devices
OSB dispatches across Chelmsford, its neighbourhoods and the surrounding Massachusetts towns.
The things we treat as non-negotiable on every Chelmsford job.
Flat pricing quoted before the work starts. Same-day and next-day slots available across Massachusetts.
“We had knob-and-tube in the attic and our insurer was getting nervous. They rewired in stages so we never lost power for more than a few hours at a time.”
“Called at 11pm when half the house went dark and an outlet was making a noise I'd never heard before. Someone was at the door in under an hour and had it isolated before midnight.”
“Whole-house LED retrofit across our warehouse. Our lighting bill dropped and you can finally read labels on the top rack.”
Most Chelmsford service calls are scheduled same-day or next-day, and emergency calls are dispatched around the clock. Call (833) 652-8933 and we'll give you a real arrival window before we hang up.
Yes. The same Chelmsford crew that swaps a dead outlet also rewires whole houses, upgrades service panels, and wires new commercial fit-outs. Nothing is too small to book.
Small repairs and diagnostics typically start in the low hundreds; larger jobs like panel upgrades or rewires are quoted flat after we see the work. You get the number before anything starts.
We do. OSB covers Chelmsford proper, its neighbourhoods, and the surrounding Massachusetts towns — the whole state is inside our service area.
Older housing stock is most of what we see in Massachusetts. Knob-and-tube, cloth-wrapped wire, fuse boxes and aluminium branch circuits are all routine work for us.
Yes — OSB runs a 24 hour emergency electrician service in Chelmsford. Call (833) 652-8933 at any hour and a dispatcher will send help.
We cover Chelmsford and its neighbourhoods, plus every surrounding town in Massachusetts. If you can find your town on our locations page, we dispatch there.
What to decide before you book a Level 2 charger install — and the load calculation that decides for you.
ReadGUIDEWhen repeated repairs stop being repairs and start being a symptom.
ReadGUIDEOne protects people. One protects buildings. They are not interchangeable.
ReadNo power, sparking outlet, burning smell or a breaker that won't reset in Chelmsford? Our line is answered 24 hours a day.