Letter Enclosing Proposal_Long Template

In plain language: Your full business name, address, and contact details at the top, followed by the letter date and the recipient's name, title, organization, and address.

Common mistake: Using a personal email address or informal phone number in the header — this undermines the professional tone the letter is meant to establish.

In plain language: An optional 'Re:' line that names the proposal topic, making it easy for the recipient to route and file the letter.

Common mistake: Omitting the reference line when responding to an RFP that assigned a tracking number — procurement teams use these numbers to match submissions to evaluation files.

In plain language: A formal greeting by name; use the recipient's last name and appropriate title rather than a generic opener.

Common mistake: Writing 'To Whom It May Concern' when the recipient's name is known. Named salutations significantly increase the likelihood the letter is read and forwarded appropriately.

In plain language: States why you are writing, references any prior meeting or RFP, and names the enclosed document explicitly.

Common mistake: Leading with a company history paragraph instead of immediately connecting to the recipient's need — this buries the reason for the letter and loses attention on the first read.

In plain language: A concise overview of what the proposal offers, the core deliverables, and the two or three most compelling benefits to the recipient.

Common mistake: Repeating the proposal document verbatim instead of highlighting the most persuasive points — the letter should sell the read, not replace it.

In plain language: Points the reader to specific sections of the enclosed proposal — pricing, case studies, credentials, or appendices — that support the claims made in the letter.

Common mistake: Referencing sections or appendices that do not exist in the final proposal package — this creates confusion and undermines the sender's credibility.

In plain language: A clear, specific instruction on what the recipient should do next — schedule a call, return a signed page, or confirm receipt by a given date.

Common mistake: Ending with a vague 'please let me know if you have questions' rather than a specific follow-up date and action — passive closings extend sales cycles unnecessarily.

In plain language: A formal sign-off followed by the sender's name, job title, company name, and direct contact details.

Common mistake: Using an informal close like 'Cheers' or 'Thanks' in a formal proposal letter — it conflicts with the professional register of the document and can affect how the proposal is evaluated.

In plain language: A line at the foot of the letter listing each document included in the submission package.

Common mistake: Listing enclosures that are not actually included in the package — discrepancies between the enclosure list and the actual contents signal disorganization and raise doubts about the proposal itself.

A letter enclosing a proposal is a formal cover letter submitted alongside a detailed proposal document. It introduces the proposal, explains why it is being submitted, highlights the key benefits for the recipient, and directs the reader to take a specific next step. It functions as the first thing the recipient reads and frames how they approach the full proposal.

It is not always legally required, but it is standard practice in professional and formal business contexts. Many RFPs specify that a cover letter must be included. Even when not mandated, an enclosing letter improves the chance your proposal is reviewed promptly by giving the recipient immediate context and a reason to read on.

One page is the standard target for most business contexts. A long enclosing letter exceeds one page only when the relationship history or proposal complexity genuinely warrants more detail. The letter's job is to frame and sell the read — not to replace the proposal itself. If your letter is running beyond one page, move detail into the proposal and tighten the letter to its core purpose.

A short enclosing letter is typically three to five paragraphs covering only the basics — context, a one-sentence summary, and a call to action. A long version adds a more detailed benefits summary, references to specific proposal sections, supporting credentials, and a fuller follow-up commitment. Use the long version when the proposal is complex, the audience is senior, or the submission requires formal justification of the approach.

Address it to the named decision-maker or primary evaluator whenever possible. If the proposal goes to a committee or evaluation panel, use the panel chair's name or, if unknown, the formal title of the responsible office (e.g., 'Dear Procurement Committee'). Avoid 'To Whom It May Concern' — it signals the letter was not tailored to this specific recipient.

Yes. This template is well-suited to formal RFP responses. Insert the RFP reference number on the reference line, mirror the project name from the RFP exactly, and confirm in the opening paragraph that the submission responds to the specified RFP. Check the RFP instructions for any required format or content requirements for the cover letter — some public-sector RFPs specify font, page limit, or required statements.

A wet ink or electronic signature is not strictly required for the letter to be effective, but adding one reinforces professionalism and signals personal accountability for the submission. For formal contract bids or government RFP responses, confirm whether a signature is explicitly required by the solicitation instructions.

Formal but direct. Avoid jargon and filler phrases like 'please find enclosed herewith.' Use plain language, active voice, and short paragraphs. The tone should feel confident and client-focused — every sentence should serve the recipient's understanding, not the sender's self-promotion.

A business proposal is the full document — it contains the scope of work, methodology, timeline, pricing, credentials, and terms. The letter enclosing the proposal is a single-page cover communication that accompanies and introduces the proposal. Think of the letter as the frame and the proposal as the content inside it. Both are submitted together, but they serve different purposes.