How to Install a Skylight on a Shingle Roof in Connecticut

What to Know Before You Start

Before jumping into a skylight installation project, a little planning goes a long way.

1. Choose the Right Spot

Not every part of a roof is a good place for a skylight.

Think about where you want more light.

Popular places include:

• Bathrooms
• Kitchens
• Hallways
• Living rooms
• Attic spaces

Also think about where the sun hits your roof.

More sunlight is not always better if it overheats a room in summer.

2. Check Your Roof Slope

Roof pitch matters.

A skylight needs proper drainage so rain and snow move off instead of pooling around it.

That matters a lot here in Connecticut where we see heavy rain, snow, and ice.

3. Look at Your Roof Framing

This part often gets overlooked.

Rafters may affect where a skylight can go.

Sometimes framing changes are needed.

And that is where things can get tricky.

Tools and Materials You May Need

Most skylight installation projects use materials like:

• Skylight unit
• Flashing kit
• Roofing underlayment
• Replacement shingles
• Roofing nails
• Framing lumber
• Utility knife
• Circular saw
• Hammer
• Sealant

A lot of modern skylights come with flashing kits, which helps.

And honestly, that flashing system matters more than many people realize.

How to Install a Skylight on a Shingle Roof Step by Step

Let’s walk through the basic process.

1. Mark the Opening

First, figure out exactly where the skylight will go.

Most installers mark the ceiling inside first, then use guide holes to locate the opening from the roof.

Measurements need to be precise.

This is not a “close enough” kind of project.

2. Remove the Shingles

Next, remove shingles around the installation area.

This gives room to cut the opening and later install flashing.

Go slow here.

Damaging surrounding shingles can create extra repair work.

3. Cut the Roof Opening

Now the roof deck gets cut for the skylight.

This step can feel intimidating, because well… you are cutting a hole in your roof.

And yes, it deserves caution.

Always make sure you know what is below and around the cut area.

4. Frame the Opening

Once the hole is cut, the opening may need framing support.

Sometimes this means adding headers or adjusting framing around the skylight.

This is one reason skylight installation can be more involved than people expect.

5. Install Waterproof Underlayment

Before setting the skylight, install waterproof underlayment around the opening.

Think of this as backup leak protection.

If wind-driven rain gets under shingles, this layer helps protect your home.

6. Set the Skylight

Place the skylight into the opening and secure it according to manufacturer instructions.

Every unit is a little different.

Follow the directions.

Guessing is not a good roofing strategy.

7. Install the Flashing

This is the big one.

Flashing is what helps keep water out.

And honestly, this is where many DIY jobs go wrong.

Flashing usually includes:

• Bottom flashing
• Side step flashing
• Top flashing

It needs to work with the shingles, not against them.

That overlap matters.

8. Reinstall Shingles

Once flashing is in place, reinstall shingles around the skylight.

Everything should blend into the roof naturally.

Done right, it should look clean and watertight.

9. Finish the Interior

After the exterior is done, finish the inside around the skylight.

That may include:

• Drywall
• Trim
• Paint
• Insulation

This is what gives it that finished look indoors.

Common Mistakes to Avoid

Skylights get blamed for leaks all the time.

But most leaks come from installation mistakes.

Here are some common ones.

1. Poor Flashing

This is the biggest one.

Bad flashing causes trouble.

Every time.

2. Bad Placement

Putting a skylight in the wrong spot can lead to drainage problems.

Water follows gravity.

It always wins.

3. Skipping Underlayment

Some shortcuts are not worth taking.

This is one of them.

4. Installing on an Aging Roof

If your shingles are near the end of their life, it may make more sense to pair skylight installation with a roof replacement.

Sometimes that saves money long term.

DIY or Call a Pro?

A lot of homeowners ask this.

Can you install a skylight yourself?

Maybe.

Should you?

That depends.

If you have roofing experience, understand flashing, and feel comfortable working on a roof, maybe DIY makes sense.

But for many people, calling a pro is the safer move.

DIY Might Work If:

• You have roofing experience
• It is a simple project
• You understand waterproofing
• You have proper safety equipment

Call a Pro If:

• This is your first skylight
• Framing changes are needed
• Your roof is steep
• You are worried about leaks
• You may need skylight repair services later

There is no shame in bringing in help.

Sometimes that is the smartest move.

Contact HammerHead Roofing for Skylight Help

If you have been researching how to install a skylight on a shingle roof, chances are you want more natural light but do not want to risk roof leaks.

We get it. It is a big decision.

At HammerHead Roofing, we help homeowners in Killingly and nearby communities with skylight installation, skylight repair services, and skylight replacement solutions designed to protect your home.

Whether you are thinking about adding a skylight or fixing an old one, we’re here to help you do it the right way. Contact us today to get started!