Write winning proposals in 10 minutes with AI

Writing a proposal from scratch is one of the biggest time sinks in running a professional services business. A consultant, a designer, a tradesperson, a solicitor, anyone who quotes for work before winning it, knows the feeling. The job isn't won yet, so every hour spent on the proposal is unguaranteed time.

AI changes the maths entirely. A thorough, personalised, professional proposal now takes ten to fifteen minutes. Here is the step-by-step process.

Before you write anything

Gather the following before you open Claude:

The client's name and business name
What they have told you they need
Any notes from your initial conversation or email exchange
Your proposed solution in plain language
Your price, broken down if relevant (labour, materials, VAT position)
Expected timeline or start date
Your business name and contact details

That is all you need. The AI does the rest.

The template prompt

Copy this prompt into Claude. Fill in every bracket with specific information about your client.

"Write a professional business proposal for the following project.

My business: [your business name], a [type of business] based in [location].

Client: [client name] at [company name], a [type of business/industry] based in [their location].

Their situation: [describe what they told you they need, in two or three sentences. Include any specific problems or goals they mentioned.]

Our proposed solution: [describe exactly what you will do for them, including any key deliverables or stages of work].

Investment: [your price]. [State whether VAT is included or will be added at 20%. If you are not VAT registered, state that prices shown are not subject to VAT.]

Timeline: [when work will start and/or be completed].

Please structure the proposal as follows: 1) A short introduction that shows we understand the client's situation and goals (do not be generic), 2) Proposed scope of work, clearly stated, 3) What is included and, if relevant, what is not included, 4) Investment/pricing, clearly presented, 5) Timeline, 6) Why work with us (two or three sentences, confident but not boastful), 7) Next steps.

Tone: professional, clear, and confident. Not salesy. Not full of filler phrases. UK English throughout."

What you get

Claude will return a full proposal, usually between 400 and 700 words depending on the complexity of the project. It will be professionally structured, read naturally, and cover everything a client needs to make a decision.

Read it once from top to bottom. You are looking for:

Anything that doesn't accurately reflect what you discussed with the client. Fix it.
Any language that doesn't sound like you. Rewrite it in your own words.
Any missing specifics that you know matter. Add them.

This editing process takes five minutes. The result is a proposal that would have taken you two hours to write from scratch.

Customising for different types of clients

Professional services (consultants, accountants, solicitors, PR agencies): Add a brief section on methodology or approach. Clients in this space want to know how you work, not just what you'll deliver. Prompt Claude to include "a brief section explaining our approach or methodology" in the structure.

Trades (builders, electricians, plumbers, landscapers): Keep it shorter. A clear, itemised quote with payment terms is often better than a lengthy proposal. Use Claude to write a clean, professional covering letter to accompany a simple schedule of works. Prompt: "Write a short, professional covering letter for a trade quote, attaching a schedule of works."

Consultants and advisors: Proposals in this space live or die on credibility. Include a brief section on relevant experience or a specific example of similar work you have done. Prompt Claude to add "a brief relevant experience section referencing [describe the project or sector]" to the structure.

Payment terms

Always include payment terms in a UK proposal. Standard options:

50% deposit on acceptance, balance on completion
Monthly instalments for longer projects
Full payment in advance for smaller projects under £500
30-day payment terms from invoice for ongoing work

State clearly whether you require a signed acceptance before work begins. Most professional service providers should. It protects you legally and filters out uncommitted enquirers.

Send it quickly

The business that sends a professional proposal within 24 hours of a meeting almost always wins over the one that takes a week. Speed signals competence and enthusiasm. With AI, there is no reason to take longer than a day.

Write the proposal, convert it to a PDF, send it with a brief personal email. Follow up three days later if you haven't heard back.

That is the whole process. Ten minutes of writing, five minutes of editing, one click to send.