Construction Bid Proposal Template

What a bid proposal is (and why the exclusions matter most)

A construction bid proposal is the customer-facing offer: a price, the scope that price buys, the conditions attached to it, and a line for the customer to accept. It is the document a GC reads to decide whether your $486,200 and a competitor’s $471,000 are actually for the same work — and, months later, the document everyone re-reads when something you never priced turns out to be expected.

That second reading is why the exclusions list is the most valuable paragraph you will write. A scope section says what you will do; an exclusions list says what you will not do, in words the other side has already accepted. Power wiring to your equipment, roof flashing, cutting and patching, utility fees, bonds, overtime: each one you name is an argument you never have. The number behind the proposal comes from the construction estimate template; this page is about everything wrapped around that number.

Section by section

• Bid documents and addenda. Drawing set and date, spec divisions, addenda acknowledged. If the documents change after you submit, this line is your price protection.
• Scope of work. One sentence promising labor, materials, equipment and supervision, then bullets by system with sheet and spec references. Reference the documents; do not restate them.
• Base bid. One lump sum for the scope above. Say whether sales tax on materials is included and whether bonds are.
• Alternates and allowances. Priced options as adds and (deducts); allowances carried in the base bid with the note that they adjust to actual cost.
• Inclusions and exclusions. Side by side so a reader sees both at once.
• Schedule. Start, substantial completion, duration, and the lead times your dates depend on — submittal turnaround, equipment ship dates.
• Payment terms and conditions. Progress billing, retainage, payment due, then six short clauses: validity, payment, changes in writing, schedule, insurance and warranty, and what happens when the proposal is accepted.
• Acceptance. Two signature blocks. When the second one is signed, this is an agreement.

A worked example: the $486,200 Harbor Point proposal

The completed example is a mechanical subcontractor’s proposal to a general contractor for the plumbing and HVAC scope of a medical office building, dated May 4, 2026 and valid for 30 days. The base bid is $486,200.00 — the estimate total from the estimate template’s example — with sales tax on materials included and bonds excluded. Three alternates sit under it: high-efficiency rooftop units per Addendum 2 (add $28,400), a BMS graphics package (add $6,750), and deleting the exam-room reheat coils (deduct $9,300). One allowance is called out inside the base bid: $1,980 to install an owner-furnished water heater, credited if deleted.

That allowance is the kind of detail a proposal earns its keep on. On our change order template the same job later deletes the water heater installation, and the credit is exactly $1,980 — no negotiation, because the proposal already said what it was worth. The schedule runs June 1 to November 18, 2026, progress billing is monthly against a schedule of values with 10% retainage, and the GC signed the acceptance on May 18 — which is the contract date on every other document in the set.

Bid vs. proposal vs. quote vs. estimate

The words blur in practice, so here is how the four documents divide the work:

• Estimate — internal cost build-up by section, with overhead and margin. Never sent as-is. Template.
• Bid — the price itself, submitted into a competitive selection, often on the GC’s bid form.
• Proposal — the bid plus scope, alternates, inclusions, exclusions, schedule and terms, with an acceptance line. This template.
• Quote — a one-page fixed-price offer for a small direct job, with line items, a deposit and an acceptance signature. Template.

After acceptance the proposal is usually followed by a subcontract on the GC’s form, sometimes with a letter of intent in between to release early work. The agreement clause in this template makes the proposal the deal until that subcontract exists, and requires the subcontract to be consistent with it — read the subcontract against your exclusions before you sign.

Alternates, allowances and unit prices

Owners rarely have every decision made at bid time. Alternates let them decide later without re-bidding: price each one as a clean add or deduct against the base bid, with the same inclusions and exclusions, and never fold them into the lump sum. Allowances cover things that cannot be priced yet — a fixture package still being selected — and should be stated as carried amounts that adjust to actual cost with a written change order. If the bid form asks for unit prices, provide them as a separate schedule for adds and deducts, with a note that they apply to changes ordered in writing, not to correcting quantities in the documents.

Common mistakes this form is built to prevent

• No validity date — a proposal from March becomes a contract price in September.
• Scope written as a restatement of the spec instead of a list of what you are doing.
• Exclusions left generic ("anything not listed") — courts and GCs read that as nothing.
• Alternates buried in the lump sum, making your base bid look high against a stripped one.
• No schedule assumptions, so a late submittal approval becomes your delay.
• Payment terms missing retainage, so the subcontract sets it at whatever the GC wants.
• Sending the estimate instead of the proposal and inviting line-item negotiation.

The full process from plans to submission is in our guide to how to create a construction bid. Pair this proposal with the scope of work template when the scope needs more room than a page, and with the subcontractor agreement for what comes next.