Introduction: CSAS Portal 2026 Opens the Door to Delhi University Admissions 

If you appeared for CUET UG 2026 and have your sights set on Delhi University, the moment you've been waiting for has finally arrived. The **DU CSAS Portal 2026** (Common Seat Allocation System) went live on **June 27, 2026**, opening the gateway for undergraduate admissions to **91 constituent colleges** of Delhi University across **79 UG programmes**. With more than **70,000 seats** up for grabs, this is one of the most important steps in your CUET UG admission journey — and getting your registration right the first time can make all the difference. 
 
In this article, we break down everything you need to know about the CSAS UG 2026 portal: what it is, who can apply, the step-by-step registration process, fees, important dates, and common mistakes to avoid. We've also linked a detailed video walkthrough below to help you complete your registration without any confusion. 

What Is the CSAS Portal? Understanding Delhi University's Admission System 

CSAS stands for **Common Seat Allocation System**, the official online portal through which Delhi University conducts all undergraduate counselling and admissions. Unlike the older system that relied on Class 12 cut-off percentages, DU has moved entirely to a **CUET-score-based admission model** since 2022. This means your CUET UG 2026 scorecard — not your board exam marks — determines your eligibility and seat allocation at DU. 
 
The CSAS portal is where CUET-qualified students: 
 
- Register for DU undergraduate admission 
- Upload academic and category documents 
- Pay the application fee 
- Fill and lock college and course preferences 
- Track and accept seat allotments 
 
All of this happens at the official website: **ugadmission.uod.ac.in** (also accessible via admission.uod.ac.in). 

CUET DU CSAS 2026: Key Highlights at a Glance 

 **Portal activation date:** June 27, 2026 
- **CUET UG 2026 result declared by NTA:** June 23, 2026 
- **Total constituent colleges:** 91 
- **Total UG programmes:** 79 (including over 100 B.A. course combinations across 67 colleges) 
- **Total seats available:** 70,000+ 
- **Admission basis:** CUET UG 2026 scores only; Class 12 marks are not considered 
- **Official website:** ugadmission.uod.ac.in 
 
This confirms that DU CSAS registration 2026 is officially open, and candidates should not delay starting their application. 

Who Is Eligible to Register on the DU CSAS UG Portal 2026?

Before you begin your CSAS UG registration, make sure you meet the following eligibility criteria: 
 
- You must have appeared for and qualified **CUET UG 2026**, conducted by the National Testing Agency (NTA). 
- You must have passed **Class 12** from a recognised board. 
- Your **CUET subject combination must match the subject mapping requirements** of the programme you wish to apply for. 
- You must hold a valid **CUET UG 2026 application number and scorecard** to log in to the portal. 
 
Tip: Always use the same email ID and mobile number you used during CUET UG registration to avoid login or verification issues on the CSAS portal. 

How to Register on the CSAS Portal 2026: Step-by-Step Process

Follow these steps carefully to complete your DU CSAS registration 2026 without errors: 
 
1. **Visit the official portal** at ugadmission.uod.ac.in. 
2. Click on the **"New Registration"** option on the homepage. 
3. Register using your **CUET UG 2026 application number** and date of birth, then create a secure password. 
4. **Log in** using your newly created credentials. 
5. Fill in your **personal, academic, and category details** carefully and accurately. 
6. **Upload the required documents** (see checklist below) in the prescribed format and size. 
7. **Verify all information** before submitting — errors at this stage can lead to rejection. 
8. **Pay the CSAS application fee** online through UPI, debit card, credit card, or net banking. 
9. **Submit the form** and download the confirmation page for future reference. 
 
Your registration is considered complete only after successful payment of the application fee — so don't stop midway. 

Documents Required for DU CSAS Registration 2026

Keep the following documents ready before you start your application to avoid last-minute hassles: 
 
- CUET UG 2026 application number and scorecard 
- Class 10 and Class 12 marksheets and certificates 
- Scanned passport-size photograph and signature 
- Category certificate (SC/ST/OBC/EWS/PwBD), if applicable 
- Extra-curricular activity (ECA) or sports certificates, if applying under those quotas 

CSAS Registration Fee Structure for DU Admission 2026

Here's what you need to know about the application fee: 
 
- **General category candidates:** ₹250 
- **SC/ST/PwBD/EWS candidates:** ₹100 
- **Extra-Curricular Activities (ECA) quota:** Additional ₹100 
- **Sports quota:** Additional ₹100 
- **Cancellation fee** (if a candidate wishes to withdraw admission): ₹1,000 
 
Payment can only be made online — cash or offline payment is not accepted. Make sure to save your payment receipt and confirmation page. 

The Three Phases of DU CSAS UG Admission 2026

Understanding the phase-wise structure of the CUET DU CSAS process helps you stay organised throughout your admission journey: 
 
### Phase 1: Registration 
Candidates complete their basic registration, upload documents, and pay the CSAS application fee. This phase is currently open. 
 
### Phase 2: Preference Filling 
Once subject mapping is complete, candidates select and arrange their preferred **college and programme combinations** in order of priority, then lock their choices. This window is expected to open in **mid-July 2026**, with a **preference change window** likely in the second week of August 2026. 
 
### Phase 3: Seat Allocation 
DU releases seat allotment lists in multiple rounds based on CUET scores, eligibility, and locked preferences. Candidates can then **accept**, **upgrade**, or **freeze** their allotted seat, followed by fee payment and document verification to confirm admission. 

Common Mistakes to Avoid While Filling the CSAS UG Form 

Many candidates lose valuable time — or even their seat — due to small, avoidable errors. Watch out for: 
 
- Entering an incorrect CUET UG application number 
- Using a different email ID or mobile number than the one registered with CUET 
- Uploading blurry, incorrect, or mismatched documents 
- Filling college and course preferences carelessly without research 
- Missing phase-wise deadlines 

Why Strategic Preference Filling Matters for DU Admission 2026

When Phase 2 opens, your preference order will directly determine which college and course you're allotted. Keep these factors in mind: 
 
- Compare previous years' closing ranks and cut-off trends for your target courses 
- Prioritise based on genuine interest, not just college reputation 
- List a broader range of preferences to maximise your allotment chances 
- Recheck your subject mapping eligibility before locking preferences 

Watch: Step-by-Step Video Guide to DU CSAS Portal Registration 2026 

To make the registration process even easier, we've created a detailed video walkthrough covering everything from logging in to locking your preferences on the CSAS UG portal.

How To Fill the DU CSAS Portal?

Frequently Asked Questions (FAQs) on CSAS Portal 2026 

When did the DU CSAS Portal 2026 open?** 
The CSAS UG Portal 2026 was activated on June 27, 2026, at ugadmission.uod.ac.in. 

2. Is Class 12 percentage considered for DU admission 2026?** 
No. Delhi University admission is based entirely on CUET UG 2026 scores; Class 12 marks are not used for selection. 
 
3. Can I edit my CSAS registration details after submission?** 
DU typically opens a correction window for registered candidates after Phase 1 closes — keep checking the official portal for updates. 
 
4. What happens if I miss the CSAS registration deadline?** 
Late applications are generally not accepted, so candidates should complete registration well before the deadline. 
 
5. How many colleges and seats are available through CSAS UG 2026?** 
91 constituent colleges and over 70,000 seats across 79 undergraduate programmes.

Final Thoughts: Don't Miss Your Chance at Delhi University 

The opening of the CSAS Portal 2026 marks the beginning of one of the most competitive and important phases of the CUET UG admission cycle. With thousands of aspirants vying for limited seats across DU's top colleges, timely registration, accurate documentation, and well-researched preference filling can significantly improve your chances of securing your dream college. 
 
Stay tuned to this space for real-time updates on CSAS Phase 2 preference filling, seat allotment lists, and DU cut-off trends for 2026-27. 
 
*For more CUET UG exam updates, preparation tips, and admission guides, keep following our blog.