Question 1

What does a roofed alfresco area cost in Cranbourne?

Accepted Answer

A typical 30-45m² roofed alfresco (the structure itself - frame, roof, gutter, downpipes, integrated stormwater) lands in $12,000-$25,000 in 2026. Colorbond gable on a steel-frame is at the bottom of that range; insulated SIP panel roof (Bondor or Versiclad) is middle; timber-batten ceiling with hidden Colorbond above is the premium finish. That excludes the slab below (separate $4K-$8K depending on footings) and the outdoor kitchen inside it (separate $25K-$50K).

Question 2

Colorbond gable vs insulated SIP panel vs timber batten - which roof is right?

Accepted Answer

Colorbond gable (most popular, ~$180/m² for the roof itself) is reliable, looks great, but is noisy in heavy rain and gets hot in summer. Insulated SIP panel (Bondor Solarspan or Versiclad, ~$250/m²) gives you ceiling lining + structural roof in one panel, R3.5+ insulation, much quieter and cooler. Timber-batten ceiling (~$350/m² with hidden steel roof behind) is the premium look - warm, hides the structure, but adds 4-6 weeks lead time. We build all three regularly. For Cranbourne new-build estates the SIP panel is usually the smart middle pick.

Question 3

Do I need a building permit for the alfresco roof?

Accepted Answer

Yes for most. City of Casey requires a building permit for any new roofed structure over 20m² floor area, over 3.6m mean height, or within boundary setbacks (typically 1m side, 3m rear in most residential zones). Engineer-stamped footings are mandatory on Class M reactive clay - which is most of Casey. Permit fee + surveyor cost is typically $1,500-$2,500. We lodge the permit and engineer the footings as part of the build. Typically 3-6 weeks from lodgement to permit issue.

Question 4

What about drainage on the alfresco roof?

Accepted Answer

Critical. A 40m² Colorbond roof drops about 1,600 litres of stormwater in a single 40mm rain event. Without proper guttering, sized downpipes (90mm minimum for that area), and connection to a stormwater pit or the legal point of discharge, water tracks back along the slab edge, undermines footings and rots cabinetry. We design the stormwater first, footings second, slab third, roof last. Every job gets an agricultural drain (ag-pipe) along the alfresco perimeter on Class M clay sites to keep ground moisture stable around footings.

Question 5

Can you build an alfresco onto an existing pergola or veranda?

Accepted Answer

Often yes, sometimes no. The first question is whether the existing posts and beam are engineered for a heavier roof load - a flimsy 1990s cypress-frame pergola with a flat polycarb roof is usually undersized for an insulated SIP panel or tiled Colorbond gable. Sometimes we can sister-up the framing and use the existing footings; sometimes the right call is to demo it and start fresh. We assess this at the consultation. Reusing an existing structure saves $8K-$15K when it works.

Question 6

What is the structural framing - steel or timber?

Accepted Answer

Steel framing (galvanised RHS posts and beams, typically 100x100x4 or 150x150x5 SHS) for larger spans and any gable over 5m clear span. Timber framing (LVL beams, 90x90 H4 treated pine posts) for smaller alfresco areas under 4m span where the look needs to be warm. We engineer-stamp the design either way. The Class M clay footings are the same regardless - bored piers or screw piles to engineer spec.

Alfresco areas in Cranbourne & the City of Casey.

The three roof finishes we build.

What’s included in the alfresco build.

Drainage - or you’ve built a swamp.

Class M reactive clay footings.

Where we work.

Free alfresco roof consultation.