Guide

Commercial due diligence checklist for BC buyers

What to check during your subject period, grouped by topic, with the official place to check it.

Say you've got an accepted offer on a two-storey retail and office building on a busy street in Surrey, with three weeks of subjects. The first week disappears faster than you'd think: the lender orders an appraisal, the environmental consultant needs site access, and the seller's documents come in a few at a time. The way through is a list, an owner for each item and a date you'll chase it by. This page is that list.

How to run the subject period

  • Day one: order the title search, ask the seller for the leases and rent roll, and book the inspections.
  • First week: get the lender's list of reports and confirm who's ordering what.
  • Second week: read the leases against the rent roll, review the reports as they land and write down every question.
  • Last few days: decide whether to remove subjects, renegotiate or walk away, and talk to your lawyer before you sign anything.
  • something is running late, ask for an extension in writing before the deadline, not after.

Due diligence is how you find out what you're really buying. It's your job as buyer, and the subject period is your window. Use this list as a starting point and adapt it with your lawyer, accountant and lender. There's also a shorter checklist on the main site.

Leases and income

Operating costs

  • Actual operating statements, tax notices, insurance and utilities.
  • Operating cost reconciliations with tenants.
  • Service contracts.

Building

  • Building condition assessment.
  • Roof, heating, ventilation and air conditioning (HVAC), electrical, plumbing, life safety.
  • Permits and inspections; outstanding work orders.

Environmental

Zoning and permits

Tax

Strata

Estoppels the day after the contract

Send estoppel certificates as soon as the contract is firm. They are slow, and they catch free rent, unpaid landlord work, and fights the rent roll skipped.

Match each estoppel to the lease and the collections file. Occupancy without payment is not income.

Your lawyer reviews form language; I help chase the commercial replies.

Common mistakes

  • Relying on seller summaries.
  • Not leaving time for reports.
  • Ignoring title charges.

Questions to ask

  • What's not in the data room?
  • What would change my price?
  • What could stop my lender?
  • Which documents did the seller say they'd send that I still don't have?
  • Who on my team has read each lease end to end?

Sources: Land Title and Survey Authority of BC, Contaminated Sites Regulation (BC Laws), Property transfer tax (Government of BC), Strata Property Act (BC Laws).


Related on this site: Commercial due diligence checklist · Strata documents checklist

Last reviewed Oct 28, 2026. General information only, not legal, tax or financial advice. Any scenarios are hypothetical.


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General information for British Columbia only. It isn’t legal, tax, accounting or financial advice, laws and rates change, and reading it doesn’t make you my client. Any numbers or scenarios are hypothetical. Check the linked official source and talk to a lawyer, accountant or other qualified professional before you act or sign anything. See the terms and disclaimer.