Issues white paper 2026
BIM Clash Report 2026
Which clashes HOOK’s BIM coordination finds most, how they happen, why, and how they get fixed. Based on 299 tagged issues from 2 projects.
Live figures from HOOK’s issue log, updated 10 Nov 2026, 01:53 (Bangkok time).
The most common clash behavior was Hard Clash: one in every 3 clashes we tagged.
- Structure × MEP
- Architecture × MEP
- Structure × Architecture
- MEP × MEP
- Structure
- Architecture
Hover or tap a floor to see its clashes. Click a dot to see that clash up close. Drag to turn, right-drag or two fingers to move, scroll or pinch to zoom.
Basement & foundations
154 issues- MEP × MEP57
- Architecture × MEP26
- Structure21
- Structure × Architecture18
- Structure × MEP17
- Architecture15
- Beam × Pipe · 22
- Beam × Door / Window · 8
- Door / Window × Pipe · 8
Each dot stands for about 50 clashes from HOOK’s issue log, drawn on the floor they were recorded on, where the two elements involved meet, and coloured by the disciplines involved. The building is illustrative.
- 299
issues reviewed
299 tagged by type, cause and fix
- 2
projects
Hotel
- 35.5%
most common clash behavior: Hard Clash
- 71.2%
most common root cause: Lack of Coordination
Shares on this page are of the 299 tagged issues.
What collides
The element pairs that clash most
Beam × Pipe topped the list with 36 clashes, 12% of all tagged issues.
Pick a pair to see it in 3D, then switch between the clash and the fix.
- Beam
- Pipe
- Clash zone
- After the fix
How Beam × Pipe clashes
- 01Clearance Violation55.6%The gap needed for access, maintenance or insulation is missing.20 issues
- 02Hard Clash50%Two solid elements take up the same space, such as a pipe running through a beam.18 issues
- 03Penetration25%A service passes through a wall, slab or beam where no opening was planned.9 issues
Share of this pair’s 36 clashes. One clash can carry more than one behavior.
How Beam × Slab clashes
- 01Clearance Violation47.4%The gap needed for access, maintenance or insulation is missing.9 issues
- 02Misalignment36.8%Elements that should line up across disciplines are offset from each other.7 issues
- 03Hard Clash26.3%Two solid elements take up the same space, such as a pipe running through a beam.5 issues
Share of this pair’s 19 clashes. One clash can carry more than one behavior.
How Beam × Shaft clashes
- 01Hard Clash58.8%Two solid elements take up the same space, such as a pipe running through a beam.10 issues
- 02Clearance Violation17.6%The gap needed for access, maintenance or insulation is missing.3 issues
- 03Location Conflict17.6%An element is placed where another discipline needs the space.3 issues
Share of this pair’s 17 clashes. One clash can carry more than one behavior.
How Beam × Door / Window clashes
- 01Hard Clash92.9%Two solid elements take up the same space, such as a pipe running through a beam.13 issues
- 02Clearance Violation14.3%The gap needed for access, maintenance or insulation is missing.2 issues
- 03Wrong Elevation14.3%An element sits at the wrong height for the levels and elements around it.2 issues
Share of this pair’s 14 clashes. One clash can carry more than one behavior.
How Beam × Wall clashes
- 01Misalignment58.3%Elements that should line up across disciplines are offset from each other.7 issues
- 02Clearance Violation33.3%The gap needed for access, maintenance or insulation is missing.4 issues
- 03Hard Clash25%Two solid elements take up the same space, such as a pipe running through a beam.3 issues
Share of this pair’s 12 clashes. One clash can carry more than one behavior.
How Door / Window × Pipe clashes
- 01Hard Clash66.7%Two solid elements take up the same space, such as a pipe running through a beam.8 issues
- 02Clearance Violation41.7%The gap needed for access, maintenance or insulation is missing.5 issues
- 03Location Conflict16.7%An element is placed where another discipline needs the space.2 issues
Share of this pair’s 12 clashes. One clash can carry more than one behavior.
How they collide
Clash behaviors
Hard Clash led the behaviors at 35.5%. A behavior describes what two elements do to each other, such as a pipe running through a beam.
Behavior
- 01Hard Clash35.5%Two solid elements take up the same space, such as a pipe running through a beam.106 issues
- 02Clearance Violation33.4%The gap needed for access, maintenance or insulation is missing.100 issues
- 03Misalignment16.7%Elements that should line up across disciplines are offset from each other.50 issues
- 04Location Conflict9.7%An element is placed where another discipline needs the space.29 issues
- 05Size Conflict7.7%An element is too big for the space or opening it has to fit into.23 issues
- 06Wrong Elevation6.7%An element sits at the wrong height for the levels and elements around it.20 issues
- 07Penetration5%A service passes through a wall, slab or beam where no opening was planned.15 issues
- 08Exposed3%An element that should be hidden shows below a ceiling or outside a finish.9 issues
Elements found in clashes
How often each element shows up in a tagged clash, on either side.
- 01Beam43.5%130 issues
- 02Pipe30.8%92 issues
- 03Slab17.4%52 issues
- 04Door / Window15.4%46 issues
- 05Equipment13.4%40 issues
- 06Shaft10.7%32 issues
- 07Wall9%27 issues
- 08Duct8%24 issues
Why
Root causes
The root cause is why a clash reached the model in the first place. It shows which step of the process needs to change.
of the clashes we tagged traced back to Lack of Coordination.
Root cause
- 01Lack of Coordination71.2%Disciplines modelled the same zone without agreeing who goes where.213 issues
- 02Model Not Linked / Outdated8%A team worked against a missing or old copy of another discipline’s model.24 issues
- 03Incorrect LOD7.4%An element was modelled at too low a level of detail to check properly.22 issues
- 04Late Design Input6%Design information arrived after the model in that area was built.18 issues
- 05Design Change Not Updated5.4%The design changed, but the model did not follow.16 issues
- 06Assumption Conflict0.3%Two teams filled the same gap in the design with different assumptions.1 issue
How we fix them
Solutions
The most common fix was ST to confirm structure, used on 34.8% of tagged issues.
Solution type
- 01ST to confirm structure34.8%104 issues
- 02AR to revise model26.8%80 issues
- 03MEP to reroute25.8%77 issues
- 04BIM to coordinate & recheck22.7%68 issues
- 05Shift Element16.7%50 issues
- 06Resize Element15.7%47 issues
- 07Change Elevation13.7%41 issues
- 08Reroute (Duct / Pipe / Tray)10.4%31 issues
From cause to fix
The root cause and solution pairs that came up most often.
- 01Lack of Coordination fixed by ST to confirm structure23.1%69 issues
- 02Lack of Coordination fixed by MEP to reroute22.4%67 issues
- 03Lack of Coordination fixed by AR to revise model20.7%62 issues
- 04Lack of Coordination fixed by Resize Element13.7%41 issues
- 05Lack of Coordination fixed by BIM to coordinate & recheck12.4%37 issues
- 06Lack of Coordination fixed by Shift Element11%33 issues
- 07Lack of Coordination fixed by Reroute (Duct / Pipe / Tray)10%30 issues
- 08Lack of Coordination fixed by Change Elevation9.7%29 issues
Disciplines involved
Architecture appeared in more tagged clashes than any other discipline.
Discipline tags
- 01Architecture71.2%213 issues
- 02Structure67.6%202 issues
- 03Sanitary24.1%72 issues
- 04Mechanical23.4%70 issues
- 05Fire Protection13.4%40 issues
- 06Electrical9.4%28 issues
- 07Interior1.3%4 issues
Discipline flags on all 299 issues
Set on every issue in the log, tagged or not, so these counts use the larger sample.
- Mechanical (ME)
- 148
- Structure (ST)
- 147
- Architecture (AR)
- 146
How this report was made
- Source
HOOK’s BIM coordination issue log (hook-tracker)
- Issues logged
23 October 2026 to 23 October 2026
- Data as of
10 Nov 2026, 01:53
- Projects
2 (Hotel)
- Sample size
299 issues logged, 299 of them tagged (100%)
- Status at cutoff
Closed 160 · Open 94 · In progress 45
- Priority
Major 153 · Minor 127 · Regulation 19
Every share on this page is a share of tagged issues. The coordination team adds the tags by hand, so coverage varies from project to project.
One issue can carry several tags, for example two elements and two behaviors, so the shares in a list can add up to more than 100%.
Project names, drawings and issue descriptions stay private. Only counts are published, grouped by project type.
The figures on this page come straight from the coordination issue log and refresh about every 10 minutes. Each year’s edition is kept as an archive with its figures fixed.
Catch the clash before it reaches site
HOOK runs BIM coordination for contractors and project owners in Thailand, from model checks to clash resolution meetings.