Primarily, there are 2 ways to apply for British citizenship. One route is where you have hold ILR (Indefinite Leave to Remain) or Settled status under the EUSS (EU Settlement Scheme). This process is known as citizenship through ‘naturalisation’. Another route is for those born in the UK who are not automatically British citizens. This process is known as citizenship through ‘registration’. The registration process is generally for children except for some adult who can register provided they meet the relevant sections under British Nationality Act 1981. 

Most people who arrived in the UK through a valid immigration route and later acquired ILR status can apply for British citizenship through naturalisation.

In this article, we have discussed the documents, fees, and timelines required for British citizenship through naturalisation. But first let us see:

Who is eligible to apply for British citizenship after ILR or EUSS- Settled status?

To be able to apply for British Citizenship through naturalization, you need to meet the following requirements.

• You must be over 18 at the time of citizenship application.

• You must hold either ILR (also known as ‘settlement’) or EUSS - Settled status at the time of your citizenship application. 

• You must have been in the UK on the first day of the qualifying period of 5 years (this applies if you are not married to or the civil partner of a British citizen) or 3 years (this applies if you are married to or the civil partner of a British citizen). 

• You must have held ILR status or EUSS - Settled status for a minimum of 12 months, unless you are married to or in a civil partnership with a British citizen.

• You must not have been absent from the UK in excess of 90 days in the last 12 months  

• You must not have been absent from the UK for more than 450 days (if applying on the 5-year route), or 270 days (if applying on the 3-year route) before you apply for citizenship 

• Unless exempt, you must meet the KOLL (Knowledge of Language and Life) in the UK requirements

• You must be of a ‘good character’.

Documents required for British Citizenship Application in 2026

You can make an application yourself or use an agent or representative to apply for British citizenship by naturalisation. Regardless of which way you apply you are required to submit the supporting documents to prove that you meet the eligibility requirements for citizenship through naturalisation.

1. General documents to prove your age 

To make a citizenship through naturalisation application, you must prove you are over 18 at the time of application. You can do this by providing your current, valid passport or, in some cases, your full birth certificate. 

The Home Office accepts the following common documents as proof of your age, including:

• Your valid passport 

• Your National Identity Card 

• Your Full birth certificates 

• Your previous passports showing your date of birth

2. Documents showing lawful residence in the UK

Before applying, you should have been lawfully resident in the UK continuously for 5 years (or 3 years, if you are applying as the spouse/civil partner of a British citizen). 

In most cases, you will only need to demonstrate that you hold a valid ILR in the UK to show that you meet the lawful residence requirement. If you hold a valid ILR, you will not normally be required to submit evidence of your immigration status during the 5- or 3-year period.  

On the other hand, if you are an EEA national, you can simply supply evidence of your settled status under the EUSS to meet this requirement.

Generally, people need to wait 1 year after they get Indefinite leave to remain unless they are married of in civil partnership with British citizen.

3. Documents showing you are free from immigration time restrictions

If you are free from immigration time restrictions in the UK, you will usually have ILR (Indefinite Leave to Remain), including ILR issued under the EUSS, which is also known as settled status.

You can submit one of the following to prove you are free from immigration time restrictions:

• Your 16-digit UAN (Unique Application Number) if you have been granted ILR or EUSS – Settled status

• Your UAN (Unique Application Number) or temporary online share code if you have an eVisa showing ILR in the UK 

4. Documents showing you meet the residence requirements without excessive absence

The Home Office must check the available evidence to see whether you meet the residence requirements.

You can use the following documents as evidence of residence:

• Stamped passports/travel documents showing arrival in the UK and entry and departure from other countries. 

• Home Office records

• Documents addressed to you in the UK

• If you do not have passports to cover the qualifying period, other evidence such as letters from employers or tax and NI (National Insurance) letters:

• In such cases you would be assessed whether there is sufficient evidence to show that you have been resident in the UK during the qualifying period, giving you the benefit of any doubt where your claimed absences are within the limits normally allowed by the Home Office and there are no grounds to doubt the accuracy of your claim

5. Documents showing you meet the KOLL (Knowledge of language and life) in the UK requirements

You must (unless you have been granted settled status under the EUSS) demonstrate KOLL (Knowledge of Language and Life). You do not need to meet this if you are aged 65 and over or have a long-term physical or mental condition that prevents you from doing so.

To satisfy the Life in the UK requirement, you will be asked to provide the reference number on your pass certificate when completing the application form.

To satisfy the English language requirements, you can provide 

• A SELT (Secure English Language Test) certificate from an approved provider and the test reference number (URN). 

• UK university degree certificate

• A degree certificate taught or researched in a majority English-speaking country

• A degree certificate that was taught or researched in a non-majority English-speaking country where your qualification is equivalent to a UK qualification

• A graduate diploma or postgraduate diploma from a UK university.

• Your passport showing that you are a national/citizen of a country that appears on the majority English-speaking country list

6. Documents showing you meet the ‘Good Character’ requirements

Being of good character usually means you observe UK laws and show respect for the rights and freedoms of its citizens. 

Commonly used information/documents for this purpose include

• Giving details of all criminal convictions in the UK and overseas

• Saying whether you have been involved in terrorism or in any crimes in the course of armed conflict, including war crimes, crimes against humanity, or genocide, or if you are the subject of an international travel ban. 

• Telling if you have used deception in your dealings with the Home Office or other government departments (for example, by providing fraudulent documents or false information)

• Confirming whether you entered the UK lawfully or not. 

Timelines for British Citizenship Application in 2026

You can apply for British citizenship under the 5-year or 3-year route. 

When you apply on the 5-year route, you must have resided in the UK for 5 years continuously and have had ILR in the UK or ‘settled status’ (also known as ILR under the EUSS) for 12 months.

You must have been physically present in the UK exactly 5 years prior to the date the Home Office receives your application. 

If not, your application may be rejected. This will depend on the reason why you were not in the UK. The Home Office will consider if special circumstances exist, for example:

• you were unable to live in the UK at the beginning of the 5-year period due to health reasons or travel restrictions

• you were asked to leave the UK during the 5 years, but this decision was later overturned

You can also apply on the 3-year route, where you hold ILR and have been married to or in a civil partnership with a British citizen for 3 years, and if so, you can apply for British citizenship immediately after receiving ILR. 

If you apply online, your application for British citizenship will be received on the same day, but it will take longer if you apply by post.

After you have applied, you should normally get a decision within 6 months. However, it may take longer.

Fees for British Citizenship Application in 2026

It costs £1,839 in 2026 to apply for British citizenship. This amount includes the £130 citizenship ceremony fee.

You will also need to enrol your biometrics (fingerprints and a photo), and there’s no fee for this.

Additional costs

These costs are not part of the main fee but are common:

• Life in the UK Test cost: £50 

• English Language Test cost (if required): £150

• Document translations cost (if required): £50–£200 

• Optional legal/consultant fees

• British passport cost after Citizenship: £102

How can Visa and Migration help?

British citizenship application process has become even more challenging in 2026. The Home Office is strictly checking whether you meet all the requirements, provide satisfactory evidence, and pay the latest fee. Any minor error can lead to immediate refusal. Therefore, you should seek the help of experts like us who fully understand UK immigration matters. 

With ongoing changes in UK immigration rules, including British citizenship, we can help you navigate the process smoothly.

For expert advice on British citizenship application process, documents, fees and timeline, you can call us at +44 (0)20 3411 1261 or write to us at info@visaandmigration.com