Architecture and Engineering Enquiries: How to Send a Phased Project Quote in Your First Reply

BOTrento Team28 October 20268 min read

Why one lump-sum quote fails on a vague brief

A client writes: "We want to convert a warehouse into offices. Can you send a price?" You do not know the condition of the building, the planning situation, the budget or whether they expect you to run the build. A single total either scares them off or leaves you carrying risk you cannot see.

A phased quote solves three problems at once:

• It matches how the work happens. Each phase produces information that the next one depends on.
• It lowers the client's commitment. They approve one stage, not the whole project.
• It protects your margin. Unknowns sit in later phases, where you price them once they are known.

The four phases and where the boundaries sit

Names differ by country and discipline, so adapt them. The point is that every phase has a clear output and a clear end.

Conceptual design

Output: options, sketches or feasibility notes, and a rough cost direction. Ends when the client chooses one direction in writing.

Detailed design

Output: drawings, specifications and calculations needed for permit and tender. Ends at an agreed issue date, with a stated number of revision rounds.

Permitting

Output: the application package and responses to authority questions. Be explicit: you prepare and submit, but you cannot promise the authority's timing or decision.

Build or implementation support

Output: site visits, contractor queries, reviewing changes, sign-off. This is the most open-ended phase, so price it as time-based unless the scope is genuinely fixed.

If the client only needs one or two of these, say so in the quote. Many enquiries are really "permit drawings only" or "site supervision only".

Choose a pricing basis for each phase

You do not have to use one method for the whole project. Pick what fits the uncertainty in each phase.

A practical default: fixed fee for the first phase, fixed fee or deliverable-based for the second, and an indicative range or hourly basis for the third and fourth. Always state that the later figures are updated after the previous phase ends.

Details will keep shifting as the client learns more. The event production quote guide shows how to handle versioned quotes and change requests, which applies equally to design work.

Reply template for a vague architectural or engineering enquiry

Send this within the same working day. It confirms the enquiry, asks only what you need, and shows the phased structure.

Subject: Your enquiry – [project/location] – proposed phased approach

Hello [Name],

Thank you for your enquiry about [project]. Projects like this are best priced in stages, because each stage answers questions the next one depends on.

Proposed phases
Phase one – Concept design: options and feasibility, ending with your chosen direction. Fixed fee.
Phase two – Detailed design: drawings and specifications for permit and tender. Fixed fee, [number] revision rounds included.
Phase three – Permitting: preparing and submitting the application and answering authority queries. Priced per deliverable once phase two is settled.
Phase four – Build support: site visits and contractor queries, on a time basis with an agreed estimate.

To send a firm figure for phase one, could you confirm:
– the site address and whether we can visit
– existing drawings or surveys, if any
– the intended use and rough budget range
– your target start date and any fixed deadlines
– who will decide on your side

I can send the phase one quote by [date]. Would a short call on [day] work?

Kind regards,
[Name]

For choosing which questions are essential, the approach in this guide to vague IT services enquiries carries over well: sort the enquiry, ask a few scoping questions, then choose the pricing model.

Step by step: build the phased quote

1. Reply first, price second. A same-day reply with the phased outline keeps you ahead of competitors who go quiet to prepare a full proposal. Our guide on replying to sales enquiries faster covers the basics.
2. Write the scope of each phase in three lines: what you deliver, what the client provides, what is excluded.
3. List assumptions. Example: existing drawings are accurate; one site visit is included; planning authority fees are paid by the client.
4. Set the exit point. Say the client may stop after any phase and keep the work paid for so far.
5. Number the version (first version, second version) and give a validity period, so changes do not become a muddle.
6. Name the next step and date in the closing line, not just "let me know".

Follow up between phases and after the quote

Phased work has more decision points, so more places to lose the thread: the quote itself, the choice of concept, the sign-off before permitting. For each one, note who must decide, by when, and when you will chase.

Keep the follow-up short and useful. Offer to resolve one open question rather than asking "any news?". If you are not sure how often to chase, read how to stop forgetting quote follow-ups.

Also record every promise you make in an email, such as "I will send the fee for the permitting phase after the survey". Those small promises are the ones that slip when you are on site.

How BOTrento Chief of Staff helps with this

BOTrento Chief of Staff is a managed process for enquiries, quotes and follow-ups. It watches the enquiries in your mailbox and in the data you upload, and every working morning it shows a "Today 1+3" overview so you know what needs attention first.

For phased quoting, it prepares draft replies, quotes and follow-ups in four languages, picks up promises such as "I'll get back to you by Friday" and reminds you of them. Nothing is sent without a person approving it, and BOTrento does not send anything by itself. It does not replace your CRM or accounting, and it does not read attachments, so it works from the email text.

AI use is included in the plan with a monthly usage limit. You can see the flow in the process demo, and the B2B services page shows how it fits firms that quote by hand. For data handling questions, start with the GDPR checklist for AI sales tools.

You can test it on your own enquiries: the 14-day free trial needs no card and no API key of your own. The 14 days start with your first successful data upload.