How Long Does a Building Inspection Take?

How long does a building inspection take?

One of the most common questions from property buyers, sellers, and agents is: how long will the building inspection take? The answer depends on several factors — the type and size of the property, its age and condition, accessibility, and the type of inspection being conducted.

Here's a practical guide to what you can expect, whether you're booking an inspection, waiting for the inspector to finish, or planning your property purchase timeline.

Typical duration by property type

Apartment or unit (1-2 hours)

A standard apartment inspection is the quickest type of residential building inspection. The scope is typically limited to the unit itself — internal areas, the balcony, and a general assessment of any visible common property issues from the unit's vantage point.

Typical timeframes:

• Small apartment (1-bed) — 45 minutes to 1 hour on site
• Standard apartment (2-3 bed) — 1 to 1.5 hours on site
• Large apartment or penthouse — 1.5 to 2 hours on site

Apartment inspections are faster because there's no roof space to inspect (in most cases), no subfloor area, limited external areas, and no site drainage to assess. However, the inspector should still thoroughly examine wet areas, windows, balconies, and internal finishes.

Note that a pre-purchase apartment inspection should ideally be paired with a strata records search to understand the broader building's condition and financial health.

Standard house (2-3 hours)

A standard residential house — typically 3-4 bedrooms on a single level or two levels — is the most common type of building inspection. The inspector needs to assess internal areas, external elevations, the roof space (if accessible), the subfloor (if accessible), the roof exterior, and site areas including drainage, paths, driveways, and outbuildings.

Typical timeframes:

• Small house (2-bed, single level) — 1.5 to 2 hours on site
• Standard house (3-4 bed, single level) — 2 to 2.5 hours on site
• Two-storey house (3-4 bed) — 2 to 3 hours on site

The subfloor and roof space inspections often add significant time. Crawling through a subfloor area to inspect stumps, bearers, joists, and plumbing penetrations is slow work — but it's where some of the most significant defects are found, including termite damage, inadequate support, and moisture issues.

Large or complex property (3-4+ hours)

Larger properties, older homes, multi-building sites, and properties with complex construction require more time:

• Large house (5+ bedrooms) — 3 to 3.5 hours on site
• Period home or heritage building — 3 to 4 hours on site (older construction methods, more potential issues)
• Rural property with multiple outbuildings — 3 to 5+ hours depending on scope
• Multi-unit or duplex — 3 to 4 hours on site

Combined building and pest inspection

If you're having a combined building and pest inspection (standard in Australia), add approximately 30-60 minutes to the above timeframes. The pest inspection involves additional assessment of all accessible timbers, use of moisture meters and potentially thermal imaging equipment, and inspection of the property's perimeter and surrounding areas for termite risk factors.

Factors that affect inspection duration

1. Property size

The most obvious factor. A 60-square-metre apartment simply has less to inspect than a 250-square-metre house on a 800-square-metre site. Larger properties have more rooms, more external areas, longer roof lines, and more site features to assess.

2. Property age

Older properties generally take longer to inspect than newer ones. This isn't because older properties are necessarily in worse condition — it's because:

• More potential issues — decades of wear, previous repairs, alterations, and additions all need assessment
• Historical construction methods — older framing systems, outdated materials, and non-standard construction require more careful evaluation
• Previous modifications — older homes often have multiple additions and alterations, each of which needs individual assessment
• More complex roof spaces and subfloors — older homes typically have more accessible (and more complex) roof and subfloor spaces

A new build with a 10-year warranty may take 1.5 hours to inspect. The same-sized house built in the 1950s with two additions might take 3 hours.

3. Accessibility

Access to key areas significantly affects how long an inspection takes:

• Roof space — if the roof space is accessible via a manhole, the inspector can conduct a thorough assessment. If access is restricted or requires moving stored items, it takes longer. If there's no access at all, the inspector must note this as a limitation
• Subfloor — crawl spaces with good clearance (600mm+) are relatively quick to inspect. Tight subfloors (300-400mm clearance) are slow and physically demanding. Some properties have no subfloor access
• Roof exterior — a single-storey roof that can be accessed by ladder is straightforward. Multi-storey roofs, steep pitches, or roofs with safety concerns may require assessment from ground level or from adjacent elevated points, which can take longer
• Locked areas — rooms, garages, or outbuildings that are locked and inaccessible at the time of inspection cannot be assessed. The inspector will note these as exclusions

4. Property condition

Properties in poor condition take longer to inspect because there are more defects to document. Each defect needs to be identified, assessed for severity, photographed, and described. A well-maintained property in good condition might have 20-30 items to note, while a poorly maintained property could have 100+.

5. Site complexity

The site around the building adds to inspection time:

• Steep or sloping sites — more complex drainage and retaining wall assessment
• Large gardens — more ground to cover when checking drainage, trees near the building, and site conditions
• Multiple outbuildings — each shed, garage, or studio needs assessment
• Swimming pools — if a pool inspection is included, add 30-60 minutes

6. Type of inspection

Different inspection types have different scopes and durations:

• Pre-purchase inspection — the most comprehensive, covering all accessible areas. This is the longest standard inspection type
• Pre-sale or vendor inspection — similar scope to pre-purchase
• Dilapidation report — primarily photographic documentation, can be quicker for the physical inspection but requires extensive photography
• Defect liability inspection — focused on identifying defects in new construction, typically faster than a full pre-purchase inspection
• Stage inspection — focused on specific construction stages, typically 1-2 hours
• Healthy Homes assessment (NZ) — focused on specific compliance criteria, typically 1-2 hours

What happens during the inspection?

A typical building inspection follows this sequence:

1. Arrival and setup (5-10 min) — confirming scope, setting up equipment
2. External inspection (30-60 min) — walking the perimeter, assessing each elevation, drainage, paths, retaining walls, and external structures
3. Subfloor inspection (15-30 min) — crawling through the subfloor to assess stumps, bearers, joists, plumbing, and evidence of moisture or pest activity
4. Internal inspection (45-90 min) — room by room, checking walls, ceilings, floors, windows, doors, fixtures, and wet areas
5. Roof space inspection (15-30 min) — assessing structure, insulation, ventilation, wiring, and evidence of leaks
6. Roof exterior inspection (15-30 min) — cladding, flashings, valleys, gutters, downpipes (from roof level or ground with binoculars/drone)
7. Verbal debrief (10-15 min) — a summary of key findings for the buyer on site

How long does it take to get the report?

This is often the more pressing question for buyers — especially when you have a conditional purchase agreement with a building inspection deadline.

Traditional reporting (2-5 business days)

Inspectors using traditional methods — a clipboard or printed checklist on site, then typing up the report in the office using a word processor — typically deliver reports in 2-5 business days. The on-site inspection might take 2-3 hours, but the report writing can take another 2-4 hours. With a busy inspector handling multiple inspections per day, the report queue can extend the delivery timeline.

Modern digital reporting (same day to next business day)

Inspectors using building inspection software or an inspection app can deliver reports significantly faster — often on the same day as the inspection.

With InspectPro, the inspector captures all data — photos, observations, measurements, and defect ratings — directly into the app during the on-site inspection. The report is assembled in real time as the inspection progresses. When the inspector finishes on site, the report is essentially complete. A quick review and the report can be sent to the client within hours.

For buyers working to tight conditional deadlines, same-day reporting can be the difference between meeting and missing your inspection condition date.

What affects report delivery time?

• Inspector workload — a busy inspector with multiple inspections per day will take longer to deliver reports
• Report complexity — a property with extensive defects generates a longer, more complex report
• Reporting method — digital/app-based reporting is significantly faster than traditional methods
• Follow-up requirements — if the inspector needs to check records, consult references, or verify information, this adds time

Tips for a smooth inspection

• Buyers: Allow at least 7-10 working days in your contract for inspection and report delivery. Attend if possible, and confirm all areas will be accessible on the day
• Sellers and agents: Ensure the inspector can access the roof space, subfloor, and all rooms. Allow 3-4 hours without time pressure
• Inspectors: Switching from clipboard to inspection software reduces total time per inspection while improving quality. Set realistic client expectations and never rush a thorough assessment

The bottom line

A building inspection typically takes 1.5 to 3 hours on site for a standard residential property, with report delivery ranging from same-day to 5 business days depending on the inspector's tools and workload. The investment of time — both yours in attending and the inspector's in conducting a thorough assessment — pays for itself many times over by identifying issues before they become your problem.

If you're an inspector looking to reduce your total inspection-to-report time without sacrificing quality, InspectPro's building inspection app helps you capture everything on site and deliver professional reports the same day. If you're in Australia, check out InspectPro for Australian inspectors.