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Specialist Printed Envelope and Pre-Paid Envelope Suppliers

– CPM are Printed Envelope Experts – free artwork and layout
– Pre-printed Mailing Wallets
– Full Colour Envelopes
– Printed Postage Impressions on Envelopes
– Royal Mail Business Reply Envelopes
– Royal Mail Freepost Envelopes
– Millions of Envelopes Printed Each Year

Envelope Sizes

There are 4 commonly used envelope sizes. In addition, there are slightly smaller or larger versions of some sizes. Smaller versions are called “undersized” and larger versions are called “oversized”.


Undersized envelopes are often used as pre-paid envelopes or business reply envelopes in mailings as they fit inside standard sized mailing envelopes.


Oversized envelopes are for use on inserting machines as they allow more space around the inserts to allow high-speed insertion.

Don’t just take our word for it…

What our print, mailing house
& direct mail clients say

Helpful… Professional…  Timely…

I have been working with the team for a number of years now and have always find them to provide an incredibly helpful, as well as professional, service. They always manage to assist with our varied requests and turn projects around in a timely fashion to meet our sometimes, fairly tight timescales.

Standard Printed Envelope Sizes

We supply millions of printed envelopes every year, Business Reply Envelopes and Freepost Envelopes to Local Authorities, Councils, Charities, PLCs, Government Departments and customers large and small. Our prices are keen and our service is superb. We design and layout the artwork for envelopes without charge.

C6 Envelope

Standard: 114mm x 162mm

DL Envelope

Standard: 110mm x 220mm

Undersize: 102mm 216mm

Oversize: 114mm x 229mm

C5 Envelope

Standard: 162mm x 229mm

Undersize: 155mm x 220mm

Oversize: 162mm x 235mm

C4 Envelope

Standard: 324mm x 229mm

Mailing House Service

Standard UK Envelope Sizes

See how the standard UK paper sizes fit into standard UK envelopes

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UK Postage Rates

With close links to Royal Mail and a keen eye on Royal Mail’s ever-changing services and postage rates, understand the most cost effective way to get your marketing material to your clients and prospects. We will talk through your requirements and look at ways of making small changes to the mail-piece which can result in big savings on your postage costs.

Sometimes, just a change in envelope size can make all the difference to the cost of the mailing.

Standard UK Envelope Sizes

See how the standard UK paper sizes fit into standard UK envelopes

Business Reply Service

Many direct mail campaigns can benefit from including a pre-paid envelope as a response element. By removing another barrier, you increase the likelihood of a prospect responding to your mailing.

Sometimes, just a change in envelope size can make all the difference to the cost of the mailing.

Mailing House Service

Using Royal Mail’s Business Reply Service is easy. You can apply for a business reply service here. This process can take up to 3 weeks so please allow time for this. Once your licence is in place, you will receive a licence number from Royal Mail. Learn more about Royal Mail Business Reply Service and Freepost here .

All you need to do is give this licence number to us, together with the correct delivery address for the envelope, which will be on your licence and we will set up the envelope template. We then proof it to Royal Mail on your behalf and once they pass the proof we print the business reply envelopes to include in your mailing.

If you already have your business reply service set up with Royal Mail and wish to use the envelopes yourself, why not check out our envelope printing prices ? We print envelopes fast and deliver FREE anywhere on the UK mainland.

See Printed Business Reply Envelope prices

To discuss envelope sizes, your Business Reply Service or Postage Rates, please call now on 01902 402693 or message us .

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Printed Envelope Specialists

Skyrocket Your Business co uk are printed envelopes specialists, producing many millions of Business Reply Envelopes and Freepost Envelopes every year. We also produce huge amounts of mailing envelopes as well as mailing them out for household names.

We supply all Business Reply and Freepost printed envelope sizes including C6 envelopes, C5 envelopes, DL envelopes and C4 envelopes.

Skyrocket Your Business co uk are a leading printed envelope supplier – Ring us on 01902 402693 for the best possible prices.