9 Best Proposal Writing Services in 2026

The best proposal writing service for UK public and private tenders in 2026 is Bid Writing Service (BWS), an established UK tender writing consultancy. AI Tender Writer comes second as an AI alternative to hiring in any sector, and a soft FM specialist is third for cleaning and security contractors.

How we evaluated proposal writing services¶

A proposal writer is only worth paying if your win rate or bid volume goes up. We looked at each service's specialism, depth of UK public-sector experience, range of services (from review to full writing), transparency on fees, and how well it suits a small business. We include AI tools because for many SMEs the realistic choice isn't which consultancy to hire, but whether to hire one at all. The reality is that plenty of small firms pay agency fees when a tool would do the job.

• UK public-sector proposal and tender experience
• Range: bid review, full writing, training, bid management
• Fee transparency
• Fit for SMEs as well as large firms
• Speed and capacity at short notice

1. Bid Writing Service: Best for full-service UK tender writing¶

Bid Writing Service pricing

When to choose Bid Writing Service

• You want a UK consultancy to write a full tender or proposal
• You bid for public and private sector work
• You want bid reviews or tender finding as well

Where Bid Writing Service falls short

• Fees not published
• Agency fees are a big outlay for occasional bidders
• Needs booking ahead of deadlines

2. AI Tender Writer: Best for SMEs who can't justify agency fees¶

AI Tender Writer pricing

When to choose AI Tender Writer

• You bid regularly and can't justify agency fees on each proposal
• You have evidence and case studies but not the time to write
• You want a first draft of every answer in minutes

Where AI Tender Writer falls short

• You still review and own the final answers
• For a critical, high-value bid, an experienced human writer adds strategy and challenge
• Focused on UK public sector tenders, so it isn't built for private-sector RFP libraries at enterprise scale
• No human writer involvement

3. CleanTender: Best for cleaning and security tenders¶

CleanTender pricing

When to choose CleanTender

• You run a cleaning or security business and bid often
• You want sector compliance built into every draft
• You want an AI alternative to hiring at a lower monthly price

Where CleanTender falls short

• Soft FM only
• No human writer involvement
• You still review, price and own every answer

4. Thornton & Lowe: Best for public-sector bids across sectors¶

Thornton & Lowe pricing

When to choose Thornton & Lowe

• You bid for public sector contracts across sectors
• You want writing, tender finding and training from one firm
• You bid repeatedly and want an ongoing relationship

Where Thornton & Lowe falls short

• Fees not published
• Better value for repeat bidders
• You still supply the evidence

5. Executive Compass: Best for tender writing and bid training¶

Executive Compass pricing

When to choose Executive Compass

• You want writing plus training for your team
• You want an independent review or edit of your own draft
• You value plenty of free guidance

Where Executive Compass falls short

• Fees not published
• Capacity peaks at busy times
• Agency fees add up over many bids

6. Hudson Succeed: Best for larger and complex bids¶

Hudson Succeed pricing

When to choose Hudson Succeed

• You have a larger or complex bid
• You bid in the UK and internationally
• You need bid management as well as writing

Where Hudson Succeed falls short

• Fees not published
• Geared to larger bids
• Costly for small contracts

7. Bid Solutions: Best for strategic bid consultancy¶

Bid Solutions pricing

When to choose Bid Solutions

• You want strategic bid consultancy
• You bid for public and private contracts
• You need bid management support

Where Bid Solutions falls short

• Fees not published
• Agency cost
• More than most micro businesses need

8. Shipley Associates: Best for proposal training and methodology¶

Shipley Associates pricing

When to choose Shipley Associates

• You want to train your team in a proven proposal method
• You want consulting on proposal process
• You run a proposal function that needs structure

Where Shipley Associates falls short

• Fees not published
• Focus on process more than volume writing
• Less suited to one quick bid

9. Upwork (freelance proposal writers): Best for one-off freelance proposal writing¶

Upwork (freelance proposal writers) pricing

When to choose Upwork (freelance proposal writers)

• You need one-off freelance help
• You can vet writers and brief them well
• You want hourly or fixed-price terms

Where Upwork (freelance proposal writers) falls short

• Quality varies widely
• You manage vetting and briefing
• Confidentiality and UK experience need checking

Proposal writing services pricing¶

How to choose a proposal writer¶

What proposal writing services actually do¶

Proposal writing services help businesses prepare bids, tenders and proposals. The label covers a wide range of work, and two firms that both call themselves proposal writers may offer very different things. Before you compare providers, be clear which of these services you need.

Agency, freelancer, in-house or AI?¶

How proposal writers charge¶

UK proposal writing services typically charge in one of four ways: a day rate, a fixed fee per bid, a monthly retainer for ongoing support, or a lower fee combined with a success fee if you win. Few providers publish prices, because the cost depends on the number of questions, word limits, complexity and deadline. Ask for a written quote that sets out exactly what is included: how many drafts, whether interviews and research are included, who reviews the final bid and whether pricing support or submission on the portal is covered.

Be cautious with pure success-fee arrangements. They can look low-risk, but they give the writer an incentive to push you towards bids you might not win or can't deliver profitably, and the fee on a multi-year contract can be large. A fair fixed fee for work you control is usually simpler.

How to brief a proposal writer¶

A writer can only be as good as the information you give them. The best UK bid writers spend much of their time interviewing people in your business and finding evidence. You can cut the cost and improve the result by preparing a brief before the kick-off call.

• The full tender pack, including clarifications, and the deadline for your internal review.
• Why you want this contract and what winning it would mean for your business.
• Your win themes: the two or three reasons this buyer should choose you.
• Case studies from similar contracts, with measurable results and client permission to use them.
• Key policies, certificates and accreditations, all in date.
• Names and CVs of the people who will deliver the contract.
• Your pricing approach, so quality answers and price describe the same service.
• Feedback and scores from previous tenders, especially losses.

Red flags when hiring a proposal writing service¶

• Guaranteed win rates. No writer controls the evaluation, the price or the competition.
• Headline win-rate claims without explanation of how they are calculated.
• No questions about your business. A writer who doesn't interview you will produce generic answers.
• Offers to write about accreditations, processes or experience you don't have. The contract will hold you to what you submit.
• No clear ownership of the final documents or your content library after the job.
• Unwillingness to say whether they use AI tools, which you may need to disclose if a buyer asks under PPN 017.

Qualifications and memberships to look for¶

There is no legal requirement for proposal writers to hold a qualification, but professional membership suggests commitment to good practice. The Association of Proposal Management Professionals (APMP) runs a certification programme with Foundation, Practitioner and Professional levels, and has an active UK chapter. Some writers also hold procurement qualifications or have worked as public-sector evaluators, which gives useful insight into how answers are scored. Ask for examples of scored feedback from past bids rather than relying on credentials alone.

Getting the most from AI if you don't hire¶

If agency fees don't make sense for the tenders you bid for, AI bid writing tools let you produce complete first drafts from your own evidence. The same brief you would give a human writer works as input: upload your policies, case studies and past bids, then let the tool draft each answer to the question and word limit. Spend the time saved on what a writer would otherwise do for you: checking every claim, shaping answers to the buyer's priorities and getting an independent review before you submit.

Proposal writing for UK public-sector tenders¶

Private-sector proposals are often persuasive documents where you control the structure. Public-sector tenders are different: under the Procurement Act 2023 the buyer publishes its award criteria and scoring method, and evaluators must mark each answer against them. A good proposal writer for public work writes to the scoring descriptors, keeps strictly within word limits, answers every sub-question in order and backs each claim with evidence. Ask any provider how they approach scored quality questions and social value under PPN 002, and whether they have experience of the Central Digital Platform and the new assessment summaries.

A typical timeline when you hire a writer¶

Sector specialists vs generalists¶

Some proposal writers work across all sectors; others specialise in construction, health and social care, facilities management, IT or education. A specialist knows the standards evaluators expect, such as CQC evidence in care, CDM 2015 and method statements in construction, or BICSc and SIA requirements in soft FM, and needs less briefing. A generalist can be a good choice for businesses that bid across several markets. Either way, ask for a sample of anonymised work in your sector and the scores it achieved.

Whichever route you choose, keep ownership of the finished answers. Ask for editable Word versions of every response, store them in your own library with the buyer's scores, and reuse them as the starting point for your next bid. Over time that library becomes the most valuable asset any writer, human or AI, can work from.

When a human proposal writer is better than AI¶

• A high-value, strategic bid where win themes and pricing strategy need expert challenge.
• A first framework bid in a new sector where you lack evidence.
• When you have no one internally to review and own the final answers.
• For regular, mid-value tenders, AI drafting with in-house review usually gives better value.

Related guides: bid writing services, best bid writers in the UK, freelance bid writers, proposal software and how to write a bid proposal.