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 3,036 tagged issues from 11 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
- Discipline not recorded
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.
Ground floor & mezzanine
1,401 issues- MEP × MEP298
- Architecture270
- Structure × Architecture245
- Structure × MEP243
- Architecture × MEP203
- Structure141
- Discipline not recorded1
- Beam × Pipe · 111
- Foundation × Pipe · 66
- Ceiling × Pipe · 44
163 issues had no floor recorded and are not drawn.
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.
- 3,819
issues reviewed
3,036 tagged by type, cause and fix
- 11
projects
Condominium
- 32.9%
most common clash behavior: Hard Clash
- 70.1%
most common root cause: Lack of Coordination
Shares on this page are of the 3,036 tagged issues.
What collides
The element pairs that clash most
Beam × Pipe topped the list with 191 clashes, 6.3% 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
- 01Hard Clash70.2%Two solid elements take up the same space, such as a pipe running through a beam.134 issues
- 02Overlap17.8%Two elements share part of the same space along their length.34 issues
- 03Location Conflict16.2%An element is placed where another discipline needs the space.31 issues
Share of this pair’s 191 clashes. One clash can carry more than one behavior.
How Ceiling × Pipe clashes
- 01Hard Clash43.4%Two solid elements take up the same space, such as a pipe running through a beam.76 issues
- 02Exposed41.7%An element that should be hidden shows below a ceiling or outside a finish.73 issues
- 03Wrong Elevation24%An element sits at the wrong height for the levels and elements around it.42 issues
Share of this pair’s 175 clashes. One clash can carry more than one behavior.
How Beam × Ceiling clashes
- 01Exposed43%An element that should be hidden shows below a ceiling or outside a finish.40 issues
- 02Hard Clash41.9%Two solid elements take up the same space, such as a pipe running through a beam.39 issues
- 03Clearance Violation9.7%The gap needed for access, maintenance or insulation is missing.9 issues
Share of this pair’s 93 clashes. One clash can carry more than one behavior.
How Beam × Slab clashes
- 01Hard Clash31.5%Two solid elements take up the same space, such as a pipe running through a beam.29 issues
- 02Wrong Elevation27.2%An element sits at the wrong height for the levels and elements around it.25 issues
- 03Clearance Violation20.7%The gap needed for access, maintenance or insulation is missing.19 issues
Share of this pair’s 92 clashes. One clash can carry more than one behavior.
How Beam × Wall clashes
- 01Exposed50%An element that should be hidden shows below a ceiling or outside a finish.37 issues
- 02Misalignment39.2%Elements that should line up across disciplines are offset from each other.29 issues
- 03Hard Clash31.1%Two solid elements take up the same space, such as a pipe running through a beam.23 issues
Share of this pair’s 74 clashes. One clash can carry more than one behavior.
How Pipe × Wall clashes
- 01Exposed43.5%An element that should be hidden shows below a ceiling or outside a finish.30 issues
- 02Hard Clash26.1%Two solid elements take up the same space, such as a pipe running through a beam.18 issues
- 03Wrong Elevation24.6%An element sits at the wrong height for the levels and elements around it.17 issues
Share of this pair’s 69 clashes. One clash can carry more than one behavior.
How they collide
Clash behaviors
Hard Clash led the behaviors at 32.9%. A behavior describes what two elements do to each other, such as a pipe running through a beam.
Behavior
- 01Hard Clash32.9%Two solid elements take up the same space, such as a pipe running through a beam.999 issues
- 02Misalignment18.9%Elements that should line up across disciplines are offset from each other.573 issues
- 03Wrong Elevation15.5%An element sits at the wrong height for the levels and elements around it.471 issues
- 04Exposed15.1%An element that should be hidden shows below a ceiling or outside a finish.457 issues
- 05Location Conflict12.3%An element is placed where another discipline needs the space.373 issues
- 06Clearance Violation9.1%The gap needed for access, maintenance or insulation is missing.275 issues
- 07Overlap5.7%Two elements share part of the same space along their length.174 issues
- 08Size Conflict5.5%An element is too big for the space or opening it has to fit into.167 issues
Elements found in clashes
How often each element shows up in a tagged clash, on either side.
- 01Pipe29.6%899 issues
- 02Beam23.6%715 issues
- 03Slab18.5%561 issues
- 04Ceiling15.1%458 issues
- 05Wall13.6%414 issues
- 06Equipment11.5%350 issues
- 07Column8.6%260 issues
- 08Door / Window7.9%241 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 Coordination70.1%Disciplines modelled the same zone without agreeing who goes where.2,127 issues
- 02Model Not Linked / Outdated10.4%A team worked against a missing or old copy of another discipline’s model.316 issues
- 03Design Change Not Updated9.2%The design changed, but the model did not follow.280 issues
- 04Late Design Input5.7%Design information arrived after the model in that area was built.174 issues
- 05Assumption Conflict3.3%Two teams filled the same gap in the design with different assumptions.99 issues
- 06Incorrect LOD3.2%An element was modelled at too low a level of detail to check properly.97 issues
- 07Wrong Discipline Reference0.8%A team referenced the wrong discipline’s model or drawing.23 issues
How we fix them
Solutions
The most common fix was MEP to reroute, used on 34% of tagged issues.
Solution type
- 01MEP to reroute34%1,031 issues
- 02ST to confirm structure31.8%966 issues
- 03AR to revise model27.3%830 issues
- 04Change Elevation16.1%490 issues
- 05Shift Element13.8%418 issues
- 06Reroute (Duct / Pipe / Tray)12.8%388 issues
- 07Revise Layout12.2%371 issues
- 08Resize Element9.3%282 issues
From cause to fix
The root cause and solution pairs that came up most often.
- 01Lack of Coordination fixed by MEP to reroute28.9%878 issues
- 02Lack of Coordination fixed by AR to revise model20%606 issues
- 03Lack of Coordination fixed by ST to confirm structure19.5%592 issues
- 04Lack of Coordination fixed by Change Elevation12.6%383 issues
- 05Lack of Coordination fixed by Reroute (Duct / Pipe / Tray)11.2%339 issues
- 06Lack of Coordination fixed by Shift Element11%335 issues
- 07Lack of Coordination fixed by Revise Layout8.4%254 issues
- 08Lack of Coordination fixed by Resize Element6.9%209 issues
Disciplines involved
Structure appeared in more tagged clashes than any other discipline.
Discipline tags
- 01Structure56.8%1,725 issues
- 02Architecture55.9%1,696 issues
- 03Sanitary35.6%1,080 issues
- 04Interior17.4%527 issues
- 05Mechanical16.5%502 issues
- 06Landscape14.2%430 issues
- 07Electrical7.2%220 issues
- 08Fire Protection4.6%139 issues
Discipline flags on all 3,819 issues
Set on every issue in the log, tagged or not, so these counts use the larger sample.
- Structure (ST)
- 1,681
- Mechanical (ME)
- 1,665
- Architecture (AR)
- 1,612
- Landscape (LA)
- 487
- Interior (ID)
- 320
- Air conditioning (AC)
- 39
- Sanitary (SN)
- 35
- Fire protection (FP)
- 15
- Electrical (EE)
- 9
- Facade (FC)
- 2
How this report was made
- Source
HOOK’s BIM coordination issue log (hook-tracker)
- Issues logged
22 January 2026 to 9 November 2026
- Data as of
10 Nov 2026, 01:53
- Projects
11 (Condominium)
- Sample size
3,819 issues logged, 3,036 of them tagged (79.5%)
- Status at cutoff
Closed 2,412 · Open 1,395 · In progress 12
- Priority
Minor 2,423 · Major 1,329 · Regulation 38 · Critical 29
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.