Can Two Different Addresses Have the Same UK Postcode?

Have you ever entered your postcode into an online form and wondered why it seems to cover several houses, flats or even an entire street? You are not alone. Many people assume that every UK address has its own unique postcode, but that is not how the system works.

So, can two addresses have the same postcode? Yes. In fact, it is completely normal for multiple addresses to share one postcode.

A UK postcode is designed to identify a relatively small geographic area and help Royal Mail and other organisations sort and deliver post efficiently. It is not usually a unique code for one individual home or business.

Understanding how the UK postcode address system works can be particularly useful when moving house, filling in online forms, ordering deliveries or trying to find the correct address for a property.

Can two addresses have the same postcode?

Yes. Two, or sometimes many more, different addresses can have the same UK postcode.

A single postcode may cover a group of neighbouring properties, such as:

• Several houses on the same street
• A block of flats
• A row of terraced homes
• Offices within a commercial building
• A small group of properties in a rural area

For example, imagine a street where 20 houses are located close together. Rather than giving every house a completely different postcode, the postcode system may assign the same postcode to a group of nearby addresses.

This means that two homes next door to each other could have different house numbers but exactly the same postcode.

However, the postcode alone does not identify the exact property. The house or flat number, building name, street name and town are still needed to identify a complete address.

Why do multiple addresses share one postcode?

The UK's postcode system was created primarily to make mail sorting and delivery more efficient. Postcodes divide the country into geographic areas, becoming increasingly specific as you move through the postcode format. 

A postcode can therefore be thought of as a location identifier rather than a unique property identifier.

For instance, a complete address might look something like:

25 Example Street

Manchester

M1 2AB

Another property at:

27 Example Street

Manchester

M1 2AB

could potentially have the same postcode. 

The postcode tells the postal service that both addresses are within the same delivery area. The house number and street address then help identify exactly where the letter or parcel needs to go.

This is an important part of the UK postcode address system and explains why entering a postcode into an address finder can sometimes produce a list of several properties.

How the UK postcode system works

If you want the UK postcode explained simply, think of it as a system that narrows down a geographic location in stages.

A typical UK postcode is divided into two parts:

Outward code + Inward code 

For example:

SW1A 1AA 

The first part, SW1A, is the outward code. It generally identifies a broader postal area and district.

The second part, 1AA, is the inward code. It helps narrow the location further for mail delivery.

The complete postcode is usually made up of between five and seven characters, excluding the space.

Although the system can identify a relatively small delivery area, it is not intended to replace the full address. The exact property still needs to be identified using details such as the property number, building name or flat number.

This is why entering a postcode into an online form may show multiple possible addresses.

How many addresses can share one postcode?

There is no simple rule that says every postcode must contain exactly a certain number of addresses.

In many urban areas, a postcode may cover a group of properties located close together. A block of flats, for example, may have multiple individual flats associated with the same postcode.

In rural locations, the situation can be different. Properties may be spread over a larger physical area, and one postcode may serve addresses that are relatively far apart compared with properties in a city.

The number of addresses associated with a postcode can therefore vary depending on the location and the type of development.

The important point is that a postcode is not the same thing as a unique address.

Can two houses have the same postcode?

Yes, absolutely.

Two houses on the same street can share a postcode. In some cases, an entire group of neighbouring homes may use the same postcode.

Let's say you are moving into a new home and your neighbour lives at number 14 while you live at number 16. If both properties fall within the same postcode area, your addresses could look like this:

14 Example Road

Birmingham

B12 3CD

and:

16 Example Road

Birmingham

B12 3CD

The postcode is identical, but the house numbers are different. 

For deliveries, the courier or postal worker uses the complete address rather than relying on the postcode alone.

Can flats and apartments share the same postcode?

Yes. This is especially common with apartment buildings and large residential developments.

Imagine a building containing 50 flats. Many or all of those flats could have the same postcode because they are located within the same building or delivery area.

However, each flat will still have its own address details, such as:

Flat 1, Example House

10 High Street

London

W1A 2BC 

and: 

Flat 2, Example House

10 High Street

London

W1A 2BC

The postcode remains the same, while the flat number distinguishes one residence from another.

This is why you should always include your flat or apartment number when providing your address for deliveries, official correspondence or online forms.

Why do online forms ask for a postcode?

Many UK websites use postcode-based address lookup tools to make filling in forms quicker. 

When you enter your postcode, the system may search an address database and display a list of matching addresses. You then select the correct property. 

This is useful when: 

• Registering with a new service
• Updating your address
• Ordering products online
• Applying for services
• Signing up for utilities
• Completing tenancy paperwork
• Registering a business address

If several addresses appear, that does not mean anything is wrong. It simply means that multiple properties are associated with the postcode. 

Always select the address that matches your exact property details.

What if two completely different streets have the same postcode?

This can sometimes happen, particularly where a postcode covers a small group of properties or a complex layout. A postcode is generally designed around postal delivery requirements rather than following every street boundary perfectly.

In some areas, the same postcode may be associated with addresses on different streets or with properties that have different address formats.

This is one reason why a postcode should not be treated as a complete address.

If you are sending an important document, make sure you provide the full address, including the property number or name, street, town or city and postcode.

Does every UK address have a postcode?

Most UK postal addresses have a postcode, and postcodes are widely used for homes, businesses and other locations.

However, not every location necessarily fits neatly into the same type of address structure. Some unusual or remote addresses may have different arrangements, and new developments can take time to be incorporated into address databases.

If you have recently moved into a new-build property, for example, your address may not immediately appear in every online address finder. This can be frustrating when completing forms or arranging deliveries.

In such cases, it is worth checking that you are using the officially recognised address details and postcode for the property.

How to find the correct postcode for an address

If you are unsure about your postcode, avoid guessing based only on a nearby property. 

Instead, search using your full address details and check the result carefully. This is particularly important if you live in a flat, converted building, new development or rural property.

When entering your address online, check:

1. Your property or house number
2. Flat or apartment number, if applicable
3. Building name, where relevant
4. Street or road name
5. Town or city
6. Correct postcode

Using the wrong postcode can lead to delivery problems or cause an online form to reject your address.

For people moving house, it is also a good idea to check your new postcode before updating banks, employers, schools, insurance providers and other organisations.

Frequently Asked Questions

1. Can two addresses have the same postcode?

Yes. Multiple addresses can share the same postcode. The postcode identifies a relatively small postal delivery area, while the house number, flat number and street name identify the specific property.

2. Can two different streets have the same UK postcode?

Yes, it is possible for addresses on different streets to be associated with the same postcode, depending on how the postcode area is organised. The complete address should always be used when identifying a specific property.

3. Is a UK postcode unique to one house?

No. A postcode is not normally unique to a single house. Several homes, flats or businesses can share the same postcode.

4. Why does my postcode show several addresses online?

This usually happens because multiple properties are registered within the same postcode. Address lookup systems display the available addresses so you can select the exact property you need.

5. Can a new-build home have the wrong or missing postcode?

Sometimes. New properties and developments may take time to appear in address databases used by websites and online forms. If your new address is missing, check the officially assigned address and postcode and allow relevant databases time to update.