# When Should You Use Pre-Built UI Components in a Project?

Every developer hits this decision at some point:

![](https://cdn.hashnode.com/uploads/covers/66c599600938e40b2837eee8/0c2374f2-6ca2-413f-bc2b-1349a1da243e.png align="center")

Should I build this UI from scratch… or use a component library?

There’s no one-size-fits-all answer - but there are clear patterns.

**What Are Pre-Built UI Components?**

A [UI component library](https://www.sencha.com/blog/when-to-choose-pre-built-ui-components-for-a-project/) gives you ready-made building blocks like:

Tables Forms Modals Charts Navigation

Instead of writing everything from scratch, you assemble your UI using these components.

**When Pre-Built Components Make Sense**

1.  You’re Building Admin Panels or Dashboards
    

These apps need:

Data grids, Filters, Forms, and real-time updates

Building all of that manually is time-consuming.

Libraries like [Sencha Ext JS](https://www.sencha.com/products/extjs/) shine here because they already include advanced components like:

Data grids with sorting/filtering, Charts, and layout systems

2\. **You Have Limited Time**

Deadlines change everything.

Instead of spending weeks on UI foundations, you:

Plug components together. Focus on business logic

3\. No Dedicated Designer

Good UI is hard.

Component libraries give you:

Consistent design, Theming Accessibility out of the box

4\. You’re Building a Proof of Concept

Speed matters more than perfection.

Pre-built components help you validate ideas quickly.

**When You Might Avoid Them**

1.  Highly Custom UI
    

If your product depends on a unique design system, pre-built components can feel restrictive.

2.  Small, Simple Projects
    

For basic apps:

Custom components are lightweight. No extra bundle size

3\. Performance-Sensitive Apps

Some libraries add extra weight - not ideal for ultra-optimized frontends.

Trade-Offs to Consider

Pros:

Faster development, Consistent UI, Built-in features

Cons:

Less control, larger bundle size, learning curve

A Simple Rule

Use pre-built components when:

UI complexity is high. Time is limited. You’re repeating patterns

Build custom when:

UI is simple. You need full control

**Final Thought**

The best teams don’t blindly choose one approach.

They balance speed vs control.

Sometimes that means:

Custom UI for public-facing pages, Component libraries for internal tools

Used correctly, pre-built components aren’t shortcuts - they’re force multipliers.