A Coquitlam homeowner called last fall with a spreadsheet. Two columns. One column laid out a phased renovation BC homeowners often default to: kitchen first this year, bathrooms next year, exterior envelope the year after. The other column: gut the whole house in one six-month push. Both totals were within $8,000 of each other. She wanted to know which version would actually cost less once the dust settled.
The honest answer is that the spreadsheet was wrong on both sides. Phased and all-at-once renovations have different real costs once you account for the line items homeowners rarely write down: mobilization charges, material escalation, stacked permit fees, livability, and the silent tax of doing the same prep work twice.
This piece walks through both paths the way an experienced contractor sees them, not the way they get pitched.
## What a phased renovation actually means in BC
A phased renovation breaks a single property into stand-alone scopes that finish independently. Each phase gets its own design, permit, mobilization, and sign-off. Common patterns we see in Greater Vancouver:
– **Interior phasing:** kitchen this year, primary bathroom next year, basement suite the year after.
– **Exterior phasing:** roof and gutters this season, siding and rainscreen the following spring, windows and doors the third year.
– **Envelope-then-interior:** stop water intrusion first with rainscreen and flashings, then update interiors once the building is dry.
The phases usually sit 12 to 24 months apart. Shorter gaps don’t behave like phasing. They’re really one project with awkward pauses. Longer than 24 months and material prices, code requirements, and your own design preferences start to drift.
In BC, a phased renovation typically requires a separate building permit for each scope above a few thousand dollars. Municipalities across the Lower Mainland process these independently and don’t grandfather earlier permits forward. That matters once we get to costs.
## The hidden costs of phasing
The brochure version of phasing says you spread the cost across years and pay as you go. The reality has four cost drivers most homeowners miss.
**Mobilization gets charged every time.** Every phase brings its own setup: dumpster delivery, scaffold rental, site protection, permit drawings, trade callouts. On a typical exterior project in Burnaby or Surrey, mobilization is $4,000 to $9,000 per phase. Three phases means you pay that fixed cost three times instead of once. The phased homeowner often spends $10,000 to $20,000 more on mobilization alone across the full job.
**Material escalation is real and uneven.** Between 2020 and 2024, exterior cladding materials moved 11% to 38% depending on the product. Stucco mesh and accessories went up faster than fiber cement. Windows had a harder run than siding. When you defer a phase 18 months, you’re betting the price drops or holds. Most years it doesn’t. A $42,000 window package quoted in 2024 routinely costs $48,000 to $51,000 by the time a third-year homeowner pulls the trigger.
**Prep work gets done twice or three times.** If you’re doing siding now and windows in two years, that second crew has to redo flashings, sometimes rip newer trim, and pay for the second access setup. The same applies inside: drywall patches at the kitchen-to-hallway transition get cut open again when the hallway is finally tackled.
**You pay for two design cycles instead of one.** Each phase needs drawings, often by a different designer if your first one’s calendar is full. Coordinating finishes across phases that are 18 months apart is hard. Many homeowners end up either accepting mismatches or redoing earlier work to align with later choices.
A realistic phased renovation in Metro Vancouver, scoped at $180,000 if done in one push, ends up at $210,000 to $235,000 once spread across three years. That gap is the cost of optionality.
## The hidden costs of all-at-once
All-at-once has its own bill of unwritten costs, concentrated in displacement and risk.
**Displacement is the biggest line item nobody puts on paper.** A six-month full renovation usually means renting elsewhere or living through it. Lower Mainland short-term rentals at 2026 prices run $3,500 to $6,500 a month for a family-sized unit. Six months of displacement adds $21,000 to $39,000 to the project. Some clients move in with family, some travel; either way, it’s a real cost.
**Financing is concentrated.** A $180,000 project paid in three phases lets a homeowner save and pay cash for portions, or use a smaller line of credit. The same project paid in one cycle usually needs a HELOC, a refinance, or a construction draw. Interest on that financing during the build period is often $3,000 to $7,000 even at favorable rates.
**Risk concentration matters.** Permit delays, weather, supply chain hiccups: when everything is happening at once, a single bad week stops every trade. We’ve seen North Vancouver projects lose four weeks to one delayed window shipment because all the interior trades were sequenced behind those windows.
**Decision fatigue is underrated.** Picking 47 finishes in eight weeks burns out most owners. The decisions made in week six often get changed in week ten, triggering rework.
A typical all-at-once [exterior renovation](https://mvconstruction.ca/exterior/) in the GVA, quoted at $180,000, lands at $195,000 to $225,000 once displacement and financing are honest. Still in range. Sometimes cheaper than phased, sometimes not.
## When a phased renovation BC homeowners pick actually saves more
There are scenarios where phasing wins on math, not just cash flow:
– **Half the scope is non-urgent.** If your roof needs replacing now and the kitchen is fine for five more years, phasing avoids paying today for a kitchen renovation that didn’t need to happen.
– **You can fund without borrowing.** If phasing means cash-only and all-at-once requires a HELOC at 6%+, the interest savings can outweigh mobilization stacking, especially on smaller jobs under $100K.
– **You’re staying long enough that finish coordination doesn’t matter.** A 20-year homeowner can run mismatched phases because by year 25 they’ll have replaced both halves anyway.
– **A code change is coming.** Sometimes phasing forward to capture a known code update like a Step Code threshold or a rebate program saves more than mobilization costs.
## When all-at-once is the cheaper math
The opposite cases are more common than homeowners expect:
– **Envelope and interior are interdependent.** If new windows require drywall patches that match new interior paint, doing them years apart costs the same prep twice.
– **You’re selling within five years.** Mismatched-vintage finishes hurt resale in Metro Vancouver markets. A West Vancouver or Kerrisdale home with 2023 kitchens and 2026 bathrooms reads as ongoing project rather than finished property, and appraisers price it accordingly.
– **The exterior has active water issues.** Phasing a leaky envelope is gambling. Every month of delay grows the mold and rot bill. We’ve replaced rotten sheathing on Kitsilano homes where the original homeowner waited 18 months to phase in a rainscreen retrofit and added $30K to the project.
– **You can absorb six months of disruption.** If you can rent or relocate, you skip the worst part of phasing: living in a half-finished house for three years.
## The contrarian point most contractors won’t say
Phasing usually sells itself on “spreading the cost,” but the real benefit is rarely financial. It’s emotional. Phasing lets people stay in their home, decide deliberately, and recover between disruptions. That has value, even if it’s not the cheapest path.
The contrarian point: if you actually optimize for total dollars spent on the house, all-at-once wins maybe 60% of the time in Metro Vancouver. Phasing wins about 25% of the time, usually for older homeowners staying long term. The remaining 15% is roughly even, and the choice should be driven by life circumstances, not spreadsheets.
Most homeowners who phase tell us afterward that they would have done it in one push if they’d known what each year of contractor mobilization actually cost.
## BC-specific factors that change the math
A few details specific to BC and the Lower Mainland tilt the decision:
**Permit calendar.** Vancouver, Burnaby, and Surrey have hit 12 to 20 weeks for building permit issuance on mid-size projects. If you phase, you wait that long every cycle. All-at-once means one wait.
**Weather windows.** Stucco, siding, and roofing in BC run cleanest April through October. Phasing across multiple years means three good seasons of waiting. All-at-once compresses the work into one good season if planned right.
**Strata complication.** If you’re in a strata building, every phase typically needs board approval. Some buildings cap how often an owner can request approvals. We’ve seen owners locked out of subsequent phases because their strata council ran out of patience.
**Market escalation.** BC construction costs ran above general inflation almost every year between 2018 and 2025. Betting against that trend is its own decision.
## How to decide
The honest framework: list the scopes you need, attach a “must do” date and a “could wait” date to each, and total the mobilization charges for both paths. Then add displacement cost to the all-at-once side and escalation cost to the phased side. The cheaper number usually surprises people.
If you’re not sure, get a contractor to quote both versions of the same project. Any [interior renovation](https://mvconstruction.ca/interior/) or exterior scope we look at, we’ll cost out as one job and as a phased job, with the line items above on the table. That’s the only way to compare honestly.
## How we work
MV Construction has run exterior, interior, and envelope renovations across the Lower Mainland for over a decade. We’re WCB-covered, licensed, fully insured, and Passive House Certified. Every project gets a written warranty, line-item pricing, and a fixed contract signed before we start work, not after the first invoice surprises you.
We’ll quote phased and all-at-once side by side and explain which way the math falls for your specific property. If the answer is phasing, we’ll tell you. If it’s not, we’ll tell you that too.
Call 778-378-6393 or [request a quote](https://mvconstruction.ca/contact-us/) and we’ll walk through both scenarios with you before you commit to either path.