What Is the IKEA Effect? Why We Overvalue Things We Build

You spent a Saturday putting together a bookshelf from a flat-pack box. It leans very slightly to the left, and one of the screws is a different colour. A friend looks at it and says it is fine. To you, it is the best shelf in the house.

That feeling, that something you built yourself is worth more than an identical one you bought, has a name: the IKEA effect.

What is the IKEA effect?

The IKEA effect is a cognitive bias in which people place a disproportionately high value on products and ideas they have helped to create, compared with equivalent ones they did not make. The name comes from the furniture retailer whose self-assembly products first inspired the research.

The research behind it

The effect was named and tested by Michael Norton, Daniel Mochon and Dan Ariely in a series of experiments published in the Journal of Consumer Psychology. In one study, participants who assembled IKEA storage boxes were willing to pay about 63 percent more for them than people who simply inspected pre-assembled ones. In others, people who folded origami or built LEGO sets valued their creations more highly than experts did.

Two details are especially interesting:

• Effort alone was enough. Even a simple, repetitive task increased how much people liked the result.
• Completion mattered. When people built something and then it was taken apart, or they were unable to finish, the effect disappeared. Effort leads to love when it leads to success.

Why it happens

Effort becomes part of the value

The labour you put in feels like part of the object. It is no longer just a shelf; it is your shelf, with a story attached.

Pride and competence

Building something successfully feels good, and that sense of competence attaches to the product. This links to cognitive dissonance: if you worked hard on something, it feels easier to believe it was worth it.

Ownership

Closely related is the endowment effect, the tendency to value what we own more than what we do not. Classic work by Kahneman, Knetsch and Thaler found people demanded more to give up a mug than they would pay to acquire it. The IKEA effect adds effort to ownership.

Identity

The things we make become extensions of who we are, so criticism of them feels personal.

Everyday examples

• DIY projects: a self-painted room feels better than a professionally painted one, even if the lines are wobbly.
• Cooking: a homemade meal tastes better to the cook than an equal restaurant meal.
• Drafts and plans: writers, founders and designers often cling to their first ideas.
• Work projects: teams overrate internal tools they built compared with better off-the-shelf solutions.
• Customisation: build-your-own products, from sneakers to salads, are priced and enjoyed more because customers feel they made them.
• Relationships and effort: the more time and energy we invest, the more we value the result, which can overlap with the sunk cost fallacy.

When the IKEA effect helps

• Motivation: involvement builds commitment. People who help create a plan are more likely to stick with it.
• Satisfaction: hobbies and crafts produce real pleasure beyond the object itself.
• Marketing and teaching: letting people participate boosts engagement and ownership.

When it hurts

• Overvaluing your own ideas. You may reject better alternatives because they were not “invented here.”
• Holding on to failing projects. Effort already spent makes it harder to let go.
• Poor pricing. Sellers who built a product themselves often ask more than the market will pay. See also the anchoring bias, which can fix the wrong number in your mind.
• Defensiveness about feedback. When work feels personal, criticism stings more.

How to reduce its effect on decisions

1. Ask what you would pay if someone else made it

Imagine a stranger offering the same product or idea. Would you still choose it at that price?

2. Get outside opinions early

Show your work to people who did not build it and ask for honest comparisons, not reassurance.

3. Compare against alternatives

List the alternatives, including ready-made ones, and score them on the same criteria. Making the comparison explicit reduces attachment.

4. Separate effort from value

Remind yourself that hours spent do not equal quality. A useful question is: “If this had cost me no effort, would I still prefer it?”

5. Set exit criteria in advance

Decide before starting a project what would make you stop or change course, so effort does not lock you in.

6. Take a cooling-off period

Leave your work for a day or two, then review it as if it belonged to someone else.

A worked example

Priya spent three months building her own scheduling tool for her small team.

• IKEA effect in action: she is convinced it is better than the £10-a-month tool a colleague suggests, even though it lacks half the features.
• Test: she asks, “If someone else had built this, would I pay for it?” and invites two colleagues to compare both tools blind.
• Result: the colleagues prefer the paid tool.
• Decision: Priya switches, and keeps her tool for the two features she loves, treating it as a learning project rather than a sunk cost.

Common mistakes

• Assuming effort equals quality. It is a feeling, not a measure.
• Asking only people who like you. Friends and relatives tend to be generous.
• Pricing by hours spent. The market pays for value, not labour.
• Holding on to unfinished work because of the time invested. See the sunk cost fallacy.
• Treating the bias as always bad. In moderation it makes work meaningful.

Frequently asked questions

What is the IKEA effect in simple terms?

We value things more when we have helped to make them, even if the result is ordinary.

Who discovered the IKEA effect?

Michael Norton, Daniel Mochon and Dan Ariely, who published their studies in 2012 in the Journal of Consumer Psychology.

Is the IKEA effect the same as the endowment effect?

They are related. The endowment effect is about valuing what we own; the IKEA effect adds the role of effort in creating it.

Does the IKEA effect only apply to furniture?

No. It applies to anything we have worked on, including crafts, meals, plans, code and creative projects.

Does the effect work if the project is not completed?

Research suggests it does not. The boost depends on successfully finishing what you started.

How can businesses use the IKEA effect?

By letting customers customise or help build products, which increases their sense of ownership and willingness to pay.

The bottom line

Effort quietly raises the value we assign to what we build. That can make hobbies and shared projects more satisfying, but it can also blind us to better options and the true worth of our own work. Ask what you would pay if someone else had made it, invite honest outside views and let effort be a source of pride, not the only measure of value.