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Prepositions after verbs

Build on vs build in

Build on usually means develop an idea or add to something existing. Build in usually means include something as part of a system or structure.

Quick answer

Which is correct: build on or build in?

Both are correct, but they have different meanings. Use build on for developing or extending something. Use build in for including something inside a design, plan, or structure.

The new policy builds on earlier research.
The software has built in security features.
We can build on your proposal.
The apartment includes built-in storage.

Choose the pattern by meaning

These forms are not interchangeable. Choose the construction by meaning, not by which preposition appears most often.

1
build on + idea/result

Develop or extend something

Build on means use something as a base for further progress.

The team built on last year's success.
Her argument builds on earlier studies.
2
build in + feature/protection

Include something as part of a system

Build in means make something a natural or permanent part of something else.

The phone has built in translation tools.
Engineers built in extra safety checks.
3
build on + location

Construct physically on a surface or area

Build on can also refer to physical construction on land or another structure.

They plan to build on the empty lot.
4
built-in + noun

Use the adjective form

Built-in is commonly used before nouns.

built-in storage saves space.

See the difference in context

The same subject can take different constructions because each sentence answers a different question.

Construction
Example
Meaning
build on
We want to build on the original plan.
develop or extend an existing idea or result
build in
The designers built in several backup systems.
include something as an internal feature
build on
The hotel was built on the coast.
construct physically on a place or surface
built-in
The car has built-in navigation.
adjective meaning included as part of the design

Common mistakes

Some combinations appear in real text but do not mean what learners often assume.

Using build in for development

Build in usually means include as part of a system, not develop an idea.

✕ We built in her theory for our new study. ✓ We built on her theory for our new study.

Forgetting the hyphen in the adjective

Use a hyphen before a noun.

✕ built in speakers ✓ built-in speakers

Confusing location and inclusion

Build on can describe physical location, while build in describes inclusion.

✕ The engineers built on extra safety features. ✓ The engineers built in extra safety features.

Quick practice

Choose the expression that matches the intended meaning.

1. The new course ___ previous training materials.
2. The system was designed to ___ automatic backups.
3. They want to ___ the land near the river.

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Frequently asked questions

Can build on refer to physical construction?

Yes. Build on can mean construct something on land or another structure.

Is built in or built-in correct?

Built-in is the adjective before a noun. Built in is usually part of a verb phrase.

Can I say build in an idea?

Usually no. For developing ideas, build on is the natural choice.

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