# Cracks in the wall or ceiling: what they mean and when to worry

Updated: 2026-10-24 · https://pros411.com/en/guides/handyman/drywall-cracks

## Short answer

Most thin, straight cracks in drywall come from normal settling or the house moving with the seasons, often at seams or above doors. Mark both ends with a pencil and write the date. If it grows past the marks or gets wider than about 1/4 inch, call a foundation repair company or a structural engineer. Same if doors start sticking. A hairline crack that stays put can be taped and patched.

## How to read a crack in the wall

![Cartoon wall with a diagonal crack running up from a door corner](https://pros411.com/img/guias/drywall-cracks.webp)

1. **A new crack? Look at its shape and where it is.** Thin cracks at seams, corners or above doors are common as a house settles. A diagonal one running from a door corner deserves a closer look.
2. **Check how wide it is.** Hairline, thinner than a credit card, is usually cosmetic. Wider than about 1/8 inch, keep an eye on it. 1/4 inch or more, get it checked.
3. **Mark both ends and write the date.** A pencil tick at each end is enough. Check it every few weeks: if it grows past the marks, the wall is still moving.
4. **Doors sticking too? That is a warning sign.** A door near the crack that suddenly sticks or will not latch can mean the foundation is shifting. That is a job for a foundation pro.
5. **Hairline and not growing? Tape and patch it.** Cover it with mesh tape, spread thin coats of joint compound, sand and paint. Paint alone usually lets the crack come back.

## What the crack is telling you

- Hairline crack along a seam or in a corner: the tape moved or the house settled. Cosmetic.
- Small cracks above doors and windows that do not grow: common in most houses, especially in the first few years.
- Diagonal or stair-step cracks from door and window corners, wider at one end: possible foundation movement.
- A ceiling crack with sagging, or with a brown ring around it: a leak or a structural problem. Do not wait.
- A crack that comes back right after you patch it: the wall is still moving.

## What not to do

- Do not just paint over a crack. Without tape it usually shows again in a few months.
- Do not fill a wide or growing crack and forget it: it hides the sign a pro needs to see. Take photos first.
- Do not pay a big deposit to "fix the foundation" before an inspection. A structural engineer gives an independent opinion.

## When to call a handyman

- The crack is wider than about 1/4 inch, keeps growing, or doors and windows started sticking at the same time.
- There are stair-step cracks in brick or block, or a horizontal crack in a basement wall.
- The ceiling sags, or there is a water stain on the ceiling around the crack.
- Floors feel sloped, or gaps open between the walls and the floor or ceiling.

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## Frequently asked questions

### When should I worry about cracks in my walls?

When a crack is wider than about 1/4 inch, keeps growing, runs diagonally from a door or window corner, or shows up with doors that stick. Those point to movement in the structure. Call a foundation repair company or a structural engineer.

### Are hairline cracks in drywall normal?

Yes. Thin cracks at seams, corners and above doors are very common, from settling and from wood drying out and swelling with the seasons. If they do not grow, tape and patch them.

### What do cracks in the ceiling mean?

Most are tape seams that moved, which is cosmetic. A ceiling crack with sagging or a brown ring points to a leak or a structural problem and needs a pro soon.

### How can I tell if a crack is getting bigger?

Mark both ends with a pencil and write the date next to it. Check every few weeks. If it grows past the marks or gets wider, it is still moving.

### Can I just paint over a crack?

You can, but it usually comes back. Mesh tape and joint compound bridge the crack so the patch holds. If it keeps coming back anyway, have it checked.

### Who do I call for cracks in my walls?

A handyman or drywall pro for hairline cracks. For wide, growing or diagonal cracks with sticking doors, a structural engineer tells you what is going on, and a foundation repair company does the fix.