How to Write a Welcome Letter to New Clients (With Templates)

Winning a new client is one of the best feelings in business. The proposal has gone in, the call went well and they have said yes. What happens next sets the tone for the whole relationship, and one of the simplest, most underrated things you can do is send a proper welcome letter.

I have sent hundreds of them over the years at Delivered Social, and I am convinced they are one of the reasons our clients stay with us. In this guide I will show you how to write a welcome letter to new clients, what to put in it, what to leave out, and give you templates you can copy and adapt today.

Why a Welcome Letter Matters

Your new client has just made a decision, and often spent money, based on trust. In the days after they sign, there is a small window where they quietly wonder whether they have made the right choice. A warm, organised welcome letter answers that question for them before they have even asked it.

A good welcome letter does a few jobs at once:

• It reassures. It confirms they have made a good decision and that they are in safe hands.
• It sets expectations. It explains what happens next, who they will deal with and how long things take.
• It saves time. Answering the obvious questions up front means fewer “just checking” emails later.
• It shows your personality. Clients buy people, not just services. The letter is a chance to sound like you.

I wrote more about the thinking behind this in the importance of sending welcome letters when you win new business. This article is the practical follow-up: how to actually write one.

What to Include in a Welcome Letter to New Clients

You do not need to include everything below in every letter, but this is the checklist I work from.

1. A genuine thank you

Start by thanking them for choosing you. Keep it short and sincere. Mention something specific about their business or your first conversation so it does not read like a form letter.

2. What happens next

This is the most important part. Spell out the first few steps in order: the kick-off call, the information you need from them, the first deliverable and roughly when it will arrive. People relax when they can see the road ahead.

3. Who they will be working with

Introduce their main contact by name, with a line about their role and how to reach them. If there is a wider team, mention them too. A photo of the team is a nice touch if you are sending a PDF or a printed letter.

4. What you need from them

Logins, brand files, a signed contract, a completed questionnaire, a first invoice paid. Whatever you need to get started, list it clearly. It is far easier for a client to tick off a list than to dig through a long email.

5. How you communicate

Tell them the best way to reach you, your normal response times and when you are open. If you use a project tool or a shared folder, explain how it works. This one paragraph prevents a lot of frustration later.

6. A personal sign-off

Sign it from a real person, ideally the founder or the account lead. A handwritten signature on a printed letter goes a long way.

What to Leave Out

• Your full terms and conditions. Attach them or link to them, but do not paste them into the letter.
• A sales pitch. They have already bought. Upselling now feels pushy.
• Jargon. Write the way you would talk to them over a coffee.
• Waffle. One page is plenty. If it scrolls forever, nobody will read it.

Welcome Letter to New Clients: Templates You Can Use

Here are three templates I have adapted over the years. Swap the details in the square brackets for your own and make the tone fit your business.

Template 1: The friendly service business

Dear [Client name],

Thank you for choosing [Your business]. We are really pleased to be working with you, and after our chat about [something specific], the whole team is excited to get started.

Here is what happens next:

1. [Name], your account manager, will be in touch by [day] to book a kick-off call.
2. Before that call, it would be great if you could send us [list of items].
3. Once we have everything, you can expect [first deliverable] by [date].

The best way to reach us is [email/phone], and we aim to reply within [timeframe] during office hours, [days and times].

If you have any questions at all, just ask. We are here to help.

Best wishes,
[Your name][Your role]

Template 2: The professional services firm

Dear [Client name],

Thank you for appointing [Your firm] to [describe the work]. We appreciate the trust you have placed in us and look forward to working with you.

Your main point of contact will be [Name, role], who can be reached on [phone] or [email]. [He/She/They] will be supported by [team members].

To begin, we will need [documents or information]. Once received, we will [first step] and aim to provide [first output] within [timeframe].

Our terms of engagement are attached for your records. Please do not hesitate to contact us if anything is unclear.

Yours sincerely,
[Your name][Your role]

Template 3: The short and warm email

Hi [First name],

Welcome aboard! Thanks so much for choosing us. I just wanted to say personally how pleased we are to be working with you.

[Name] will be your main contact and will be in touch shortly to get things moving. In the meantime, if you could send over [one or two things], that would be brilliant.

Looking forward to it.

[Your name]

Email, PDF or Printed Letter?

All three work. The right choice depends on your business and your clients.

• Email is quick and easy and works well for most service businesses. Make it personal rather than an automated message from a system.
• A branded PDF feels more substantial. It is great for onboarding packs with team photos, timelines and useful links.
• A printed letter stands out because almost nobody sends them any more. Pop it in the post with a handwritten note and you will be remembered.

Many businesses use a combination: a short email on the day they sign, followed by a printed welcome pack a few days later.

Tips to Make Your Welcome Letter Stand Out

Send it fast

Aim to send it within 24 hours of the client signing. The excitement is highest then, and so is the worry. Speed shows you are organised.

Make it personal

Even if you use a template, add one or two lines that could only be written to that client. Mention their goals, their team or something from your first meeting.

Add a small gift

You do not need to spend much. A branded notebook, a bag of good coffee or some local treats with the letter can make a lasting impression. It is the thought that counts.

Include a timeline

A simple visual timeline of the first 30, 60 or 90 days is incredibly reassuring. It shows you have a plan and helps the client explain the project to their own team.

Follow it up

The welcome letter is the start, not the end. Make sure the next steps you promised actually happen on time. A great letter followed by silence is worse than no letter at all.

Adapting Your Welcome Letter for Different Clients

One template rarely fits everyone. A few small tweaks make your welcome letter feel right for each type of client.

Small businesses and sole traders

Owners of small businesses are usually busy and doing everything themselves. Keep the letter short, friendly and practical. Focus on what you need from them and how little of their time the process will take. Reassurance that you will handle the detail goes a long way.

Larger companies

With bigger clients there may be several people involved, from a marketing manager to a finance team. Make sure the letter explains who does what on both sides, how invoices will be handled and how you will report progress. It often helps to send a copy to everyone who will be involved.

Retainer clients

For ongoing work, explain the rhythm of the relationship: monthly reports, regular check-in calls and how to request extra work. Clients on retainers want to know what they will get each month and how to get the most from it.

One-off projects

For a single project, focus on milestones and the finish line. Set out the key stages, when you will need feedback and what “done” looks like, so there are no surprises at the end.

Returning clients

When a past client comes back, a welcome back letter is a lovely touch. Thank them for returning, mention what you did together before and highlight anything new about your business since then.

A Quick Welcome Letter Checklist

Before you hit send, run through this list:

• Have I thanked them and mentioned something specific?
• Are the next steps clear, in order and with rough dates?
• Have I introduced their main contact with name and contact details?
• Is it clear what I need from them?
• Have I explained how and when to reach us?
• Are all names, spellings and dates correct?
• Is it signed by a real person?

Common Mistakes to Avoid

• Sending a generic, automated message. Clients can tell, and it undoes the point of the letter.
• Getting names or details wrong. Double-check spelling, company names and dates.
• Overpromising. Only commit to timescales you are confident you can meet.
• Burying the next steps. Put the important information near the top where it will be seen.
• Forgetting the client’s team. If others at their business will be involved, say how you will work with them too.

How a Welcome Letter Fits Into Client Onboarding

The letter works best as part of a simple onboarding process. At my agency, a new client typically gets a welcome email, a short questionnaire, a kick-off call and access to a shared folder, all within the first week. The letter ties it all together and tells the client what to expect.

If you are building your processes from scratch, it is worth writing them down early. It is one of the things I talk about in starting a business again and what I would do differently. Good onboarding also pays off later when you ask for a review. Happy clients who felt looked after from day one are far more likely to leave one, and I have shared some ideas on that in my guide to Google reviews for small businesses.

Common Questions

How long should a welcome letter to a new client be?

Usually one page or a short email. Long enough to cover the next steps and contacts, short enough to read in a couple of minutes.

When should I send it?

Within 24 hours of the client signing or paying, while their decision is fresh.

Should the welcome letter come from the owner?

In a small business, yes if possible. A letter from the founder or the person who won the work feels more personal. In bigger firms, the account lead is a great choice.

Can I automate welcome letters?

You can automate the sending, but personalise the content. Use a template with gaps you fill in for each client rather than a generic message nobody has touched.

Start Every Relationship Well

A welcome letter to new clients takes ten minutes to write and can shape a client relationship for years. Thank them, tell them what happens next, introduce the team and make it easy for them to get in touch. Do that well and you are already ahead of most of your competitors.

If you would like help with your client onboarding, your marketing or anything else in this article, feel free to get in touch, or have a look around my blog for more practical business guides.