An informal letter is a personal piece of writing sent to someone you know — a friend, relative, or pen pal. Unlike formal letters, it uses a conversational tone, friendly language, and a relaxed structure. In KS3 English, writing one well means matching your vocabulary and register to the relationship you share with the reader.
How is an informal letter different from a formal letter?
Understanding the contrast is the fastest way to lock in what each form requires:
| Feature | Informal letter | Formal letter |
|---|---|---|
| Recipient | Someone you know personally | An organisation, employer, or stranger |
| Tone | Warm, conversational, personal | Polite, professional, neutral |
| Opening | "Dear [first name]," / "Hi [name]," | "Dear Mr/Ms [surname]," / "Dear Sir or Madam," |
| Closing | "Lots of love," / "Best wishes," / "Take care," | "Yours sincerely," / "Yours faithfully," |
| Vocabulary | Colloquial, contractions allowed | Formal, no contractions |
| Address | Your address, top right (in traditional format) | Your address + recipient's address |
The key question to ask yourself before you begin: how well do I know this person, and what is the purpose of this letter? That answer determines your register.
What is the correct layout for an informal letter?
A KS3 informal letter follows this structure:
- Your address (top right corner, no name) — optional for informal letters but included in many school exam tasks
- Date — written below your address in full: "9th July 2026"
- Greeting — "Dear [first name]," — note the comma, not a colon
- Opening paragraph — Re-establish connection and signal the letter's purpose: "I hope you're well — it feels like ages since we last saw each other! I'm writing because…"
- Main body — Two or three paragraphs, each covering a different topic or aspect of what you want to share or ask
- Closing paragraph — Refer forward to future contact: "I really hope we can catch up soon"; ask a question back to maintain dialogue
- Sign-off — "Best wishes," / "Lots of love," / "Speak soon," — and then your first name (not full name in an informal letter)
Notice that informal letters do not need to include the recipient's address.
How do I choose the right tone and vocabulary?
Tone in an informal letter is shaped by three choices:
1. Person and pronouns. Informal letters use "I" and "you" freely — they are personal and direct.
2. Contractions and colloquialisms. You can use contractions ("I'm", "you're", "it's") and some colloquial vocabulary ("brilliant", "gutted", "absolutely") — but do not overdo slang, which can make the letter feel more like a text message than a crafted piece of writing.
3. Sentence variety. Informal writing does not mean monotonous short sentences. Mix lengths: use short sentences for emphasis and longer, flowing ones to describe events or feelings.
Worked example — comparing a weak and stronger opening paragraph
Weak: "Dear Sam, How are you? I am fine. I wanted to write to you because I have something to tell you."
Stronger: "Dear Sam, I hope the Easter holidays have treated you well! Something rather extraordinary has happened since I last wrote, and I couldn't wait to tell you about it — I'm not sure whether to be delighted or terrified, but here goes…"
The stronger version establishes warmth ("I hope the Easter holidays have treated you well"), creates intrigue ("something rather extraordinary"), and uses a dash and ellipsis to mirror the voice of a real, excited person mid-thought. It does not read like a template.
How do I structure the middle paragraphs?
Each middle paragraph in an informal letter should cover a distinct topic or strand. You might:
- Share news about something that has happened to you
- Respond to something the recipient last told you
- Ask about their life, plans, or wellbeing
- Reflect on a shared memory or experience
Signpost your paragraphs naturally: "Anyway, on a completely different note…" or "Oh — I forgot to mention…" This kind of verbal bridging makes the letter feel like a real, flowing conversation rather than a sequence of disconnected sections.
One useful technique: end each middle paragraph with either a question or a reference forward to the closing. This keeps the letter in dialogue with the reader rather than becoming a monologue.
How do I write a strong opening and closing?
Opening: Avoid "I am writing to you because…" — it is flat and obvious. Instead, try:
- A warm reference to your relationship: "It's been far too long…"
- A direct hook: "You will never guess what has happened."
- A shared reference: "Do you remember that conversation we had in December? Well…"
Closing: The final paragraph should:
- Signal that you are wrapping up naturally: "Anyway, I've rambled on long enough…"
- Look forward to contact: "Write back soon — I want to hear all about…"
- Match the warmth of your opening
Then choose a sign-off that fits the relationship: "Lots of love" for close family or best friends; "Best wishes" or "Speak soon" for friends you are less intimate with.
What should I avoid in an informal letter at KS3?
- Do not forget the date and greeting — even in informal letters, these are conventions the examiner will check
- Do not write in bullet points — informal letters should always use continuous prose
- Do not use text abbreviations (lol, tbh, omg) — these are not appropriate even in informal writing at KS3 level
- Do not be so informal that you lose coherence — clear paragraphing still matters
- Do not drift into the wrong form — an informal letter is not a diary entry, a blog post, or a stream of consciousness
Frequently asked questions
Do informal letters always start with "Dear"?
Traditionally, yes — "Dear [name]" is the standard greeting for both formal and informal letters. In some contexts, "Hi [name]" or "Hello [name]" might appear in a very informal letter, and some task briefs allow for this. However, unless the task says otherwise, "Dear [first name]," is the safest and most acceptable convention for KS3 English.
Should I include a specific address in the letter?
For KS3 exam tasks, include your own address (top right) if the question specifically asks you to lay out the letter. For in-class tasks without a specific prompt, it is good practice to include the date and greeting at minimum. Always follow the conventions the examiner signals the task requires.
How long should a KS3 informal letter be?
A typical KS3 informal letter should be three to five paragraphs — roughly 250 to 400 words. It should feel substantial but not sprawling. Each paragraph should have a clear focus, and the letter should feel complete, with a natural beginning, middle, and end.
Can I include humour in an informal letter?
Yes — and it is one of the features that can make a letter come alive. Light irony, a well-placed understatement, or a funny anecdote can all demonstrate an assured, sophisticated writing voice. The key is that the humour feels natural to the relationship described, not forced.
Professor Quill at aitutors.me can give you targeted feedback on your tone, structure, and register before your next writing assessment.