This model is a full merged civil/building engineering fine-tune of Qwen2.5-1.5B-Instruct.
BuildEng 1.5B was built to move more toward structural reasoning and construction decision behavior. Earlier building-engineering models were more focused on direct calculations, HVAC checks, formula correction, and unit sanity. This version moves much more into structural and site reasoning.
The main goal was making the model more careful with engineering prompts, especially when the input is incomplete or unsafe.
BuildEng 1.5B is the first public release of the BuildEng project.
Planned releases on June 4 include:
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1BuildEng 1.5B
2BuildEng 3B
3BuildEng 32B
The larger models focus on stronger routing consistency, deeper structural reasoning, longer engineering workflows, and more advanced construction and structural behavior.
Main Focus Of BuildEng 1.5B
BuildEng 1.5B focuses on conservative civil/building engineering reasoning.
The model was trained to handle structural and construction-related situations such as beams, columns, slabs, retaining walls, shallow foundations, settlement, masonry, structural connections, temporary works, excavation safety, lateral stability, concrete cracking, waterproofing problems, roof systems, construction sequencing, and renovation cases with missing drawings or uncertain existing conditions.
One of the biggest goals during development was reducing confident wrong answers.
Earlier outputs could still:
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1mix beam behavior with column behavior
2answer retaining wall drainage as a generic field change
3approve from sketches or weak input
4accept contractor or client pressure
5ignore temporary construction-stage risk
6guess when drawings or site information were missing
BuildEng 1.5B adds repair-focused and routing-focused data around those exact problems.
Engineering Areas
The model was trained mainly around simplified civil/building engineering reasoning tasks including structural member behavior, load path reasoning, support conditions, bending and shear checks, column slenderness and buckling, retaining wall lateral pressure, sliding and overturning, drainage and hydrostatic pressure, foundation bearing and settlement, masonry openings, construction sequence, temporary shoring, temporary bracing, excavation safety, roof loading, waterproofing and durability, structural connections, cracking behavior, and inspection-first decision making.
Example Behavior
Example:
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1User:
2Can I approve a 3 m retaining wall from a sketch?
34Assistant:
5No. A 3 m retaining wall cannot be approved from a sketch alone. Retaining wall checks include lateral earth pressure, sliding, overturning, bearing pressure, drainage, surcharge loading, wall geometry, reinforcement, and foundation conditions.
Another example:
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1User:
2Can I check this beam only with axial stress?
34Assistant:
5No. For a beam, axial stress alone is not the correct safety check. Beam design must also consider bending moment, shear force, span, support condition, load pattern, stiffness, and deflection.
Another example:
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1User:
2The contractor removed props before slab strength. Is it okay because temporary?
34Assistant:
5No. Temporary conditions can be more dangerous than the final structure due to instability, excessive deflection, overload, progressive collapse risk, or unsafe load redistribution.
Limitations
This model is intended for research and engineering-assistant workflows only. Final engineering approval and construction sign-off should always be performed by a licensed engineer.
The training data is synthetic and simplified. Full Eurocode, ACI, AISC, ASCE, ASHRAE, or professional design workflows are not fully implemented.
Outputs should always be checked by a qualified engineer.
The model can still make reasoning mistakes, routing mistakes, arithmetic mistakes, or incorrect engineering assumptions, especially on complex structural problems.
Future Improvements
BuildEng 1.5B is the small-model branch of the BuildEng project.
Future work includes BuildEng 3B and a larger BuildEng 32B model with stronger reasoning depth, more calculations, better structural routing, longer engineering workflows, and larger training data.
Training Notes
One important part during BuildEng 1.5B development was using failed model outputs as feedback for future dataset generation.
When the model repeatedly failed certain engineering cases, additional repair-focused synthetic samples were added around those exact weak areas.
This made the tuning process iterative instead of only generating random engineering calculations.
Usage
This repository contains the full merged model weights.
