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Which opener fits your door?

Enter your door size, material and ceiling to see which drive types are worth asking about, whether you need a rail extension kit, and what a professional should confirm. It is an estimate, not a quote, and it shows no prices.

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Garage door opener motor unit and rail on a garage ceiling

Estimator

Your door, your options

Measure the door opening, not the outside trim. Most single doors are about 8 or 9 ft wide and most double doors about 16 ft.

Rules of thumb

What matters more than horsepower

Opener choice is mostly about noise, mounting and the door itself.

Balance first

The springs carry the door, not the opener. DASMA TDS-174 describes a balanced door.

Door height

Many ceiling openers need the maker's extension kit for an 8 ft tall door.

Noise

Belt drives are quieter than chain, which matters with rooms above the garage.

Safety sensors

Every new residential opener must meet 16 CFR 1211, including reversal on contact.

Sources

Where the rules come from

Read on the date shown. Horsepower guidance varies by maker, so we do not state one.

  1. Chain drive rail extension kit for 8 ft high garage doors. Chamberlain.

    Opener makers sell rail extension kits for 8 ft doors, matched to the opener model.

    Accessed
  2. TDS-174: Door balance. DASMA.

    A balanced door takes as much force to lift as to close at the balance point.

    Accessed
  3. Chamberlain Group support: manuals, model lookup and programming. Chamberlain Group (LiftMaster, Chamberlain).

    Finding an opener model number, its manual and remote programming steps.

    Accessed
  4. 16 CFR Part 1211, Safety Standard for Automatic Residential Garage Door Operators. Electronic Code of Federal Regulations.

    Applies to residential openers made on or after January 1, 1993; a closing door must start reversing within 2 seconds of contact, and photo eyes are an allowed secondary device.

    Accessed

Short answers

Opener questions, answered first

Short answers.

What horsepower opener do I need?

It depends on the maker and the door, so have it confirmed on site. Makers rate openers differently. A balanced door is what matters most, because the springs carry the weight.

Do I need an extension kit for an 8 ft door?

Usually, for ceiling-mount openers. Makers sell kits matched to their models, such as Chamberlain’s 8 ft chain drive kit.

What is a wall-mount opener?

An opener that mounts beside the door on the torsion bar. It frees the ceiling, but needs a torsion spring setup and some side room. Confirm both before buying.

Send the details

Get an opener installed

The estimator can fill this in. Add the model of your current opener if you know it.

What happens next

  1. 1 Send the details What the door is doing, your town, and a photo or two if you have them.
  2. 2 We follow up You hear back the way you asked, with next steps.
  3. 3 Price in writing You see it before any work starts, and the yes or no stays with you.

What helps us price it

  • A photo of the whole door from inside, and one of the problem
  • Door width and height, roughly (most are 8 or 16 ft wide)
  • The opener brand and model, from the label on the motor
  • Whether the door is single or double, steel or wood, insulated or not
  • Whether it is stuck open, stuck shut or still working

If anyone is trapped or hurt, call 911 first. Do not try to free a door by loosening springs or cables.

Tell us about the door

We read every request and reply with next steps.

Price first: you get a written price before any work starts, and nothing starts until you say yes.

A phone number, an email, or both. Up to 3 photos: JPEG, PNG or WebP, 8 MB each, 20 MB total. We remove location data.

    We use your details only to answer this request and to share it with the garage door professional who quotes it. Privacy. If someone is trapped or hurt, call 911 first.