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BuildManager report / railway-road-4
91-99 Railway Road, Blackburn

Closest overall yet. Still too noisy to price straight through.

This is a manual review of BuildManager run 019d33d6-1da8-738a-bbed-acf2673c5162 against the human QS workbook and the previous AI pass 019d313f-b455-712a-9c67-de8aa6cd0a7d. Compared with run 3, this pass is materially better on doors, floor finishes, equipment separation and even partial waterproofing. The cost of that improvement is noise: more flags, more review placeholders, and validator traces that still bleed into the output.

Human Workbook
500
19 priced sections, dated 15 February 2023
Previous AI Run
267
Run 3 restored scope, but over-grouped the doors
Current AI Run
528
Run 4 is richer and noisier: 44 flags, 10 allowances, 3 derived rows
Net Read
Closest yet
Best overall workbook proxy so far, but still too noisy for direct pricing
What changed

Run 4 fixes the run-3 door problem, but it exposes too much QA noise

What improved

Doors, equipment and waterproofing all move forward

The pipeline backs away from unsafe door-family grouping, returns to an exact 91-door schedule, separates equipment into its own trade, and starts emitting actual waterproofing quantities instead of flags only.

What regressed

Bill hygiene is worse again

Run 4 is much richer, but it also contains more validator traces, code-review placeholders and bill-adjacent QA rows. It is closer to the workbook, but less clean to hand straight to pricing.

Proof points

Green, amber, red checks

Green Amber Red
Metric Human workbook Run 3 Run 4 Call Interpretation
Overall output volume 500 workbook rows 267 AI rows 528 AI rows +5.6% vs human Run 4 is back above the workbook row count, which tells you it is richer than run 3 but also more fragmented and less tidy.
Door schedule integrity 91 new doors grouped into 14 clean pricing lines 16 family rows in Doors totaling 116 EA, plus major DT reconciliation leakage 91 explicit door rows totaling 91 EA, with only two small validator traces outside Doors Recovered exact count This is the biggest run-4 improvement. The pipeline has backed away from unsafe family grouping and returned to explicit openings.
Genuine floor-finish coverage 1,499.57 m² of floor finishes and tiling 1,447.59 m² 1,516.79 m² +1.1% vs human Run 4 keeps the recovered floor package from run 3 and brings TL3 fully back into range as well.
Skirting length 737.33 lm 625.40 lm 662.50 lm -10.1% vs human Skirtings improve again, but they are still short enough that a QS would want to review transitions and wet-area edges.
Joinery and equipment structure 124 joinery-style lines plus 33 equipment lines 48 joinery rows with no dedicated equipment trade 168 joinery rows plus 33 equipment rows Closer, but over-split Run 4 is much closer to the workbook structure because appliances and amenities hardware are now separated, but the joinery itself is overly exploded.
Waterproofing 229.90 m² measured explicitly No measured trade, only unresolved flags 46.69 m² floor membrane plus threshold waterstops and perimeter sealant Partial recovery This is the first run that starts to measure waterproofing, but it still falls well short of the full floor-and-wall package in the workbook.
Painting and wall-finish packaging Mostly area-based painting with separate finish packages 1,139.3 m² painting plus 1,979.5 m of mixed specials 619.4 m² painting plus 27 wall-finish rows of height-coded lengths Richer, less normalised Run 4 exposes more of the finish logic as dedicated rows, but it is less converted into direct pricing units than run 3.
Signage 11 EA 0 EA 1 EA Back, still -90.9% The run recovers one signage item, but the broader schedule is still missing almost entirely.
Services and commercial wrapper 16 wrapper rows including consultants and MEP provisional sums 10 allowances plus isolated review items 10 allowances plus one electrical review item and one mechanical indicative item Still under-scoped Architecture is improving faster than commercial completeness. The wrapper layer is still not behaving like a real estimate.
Bill hygiene No validator traces or code-review placeholders in priced output 24 flags and large leaked DT validator rows 44 flags, smaller DT validator traces, and several code-review items still visible in trades Noisier again Run 4 is diagnostically richer, but those QA traces should not surface as bill items. The extractor and the bill layer still need cleaner separation.
Side-by-side comparison

Where run 4 is genuinely closer to the workbook, and where it is still weak

This pass is not just a bigger schedule. It is a better commercial proxy in some core areas. The remaining question is how much cleanup a QS still has to do before pricing.

Category

Doors

Human workbook

91 new doors are grouped cleanly and are commercially safe to price.

Run 3

Run 3 over-aggregated the door package into family rows, which made the count and the bill logic unsafe.

Run 4

Run 4 returns to 91 explicit door rows, which is a much safer abstraction. The remaining DT3 and DT4 validator traces are small, but they still should not surface.

Call
Big improvement
Pipeline improvement

Keep the explicit opening mode for doors, then suppress validator traces before the bill is emitted.

Category

Floor finishes and skirtings

Human workbook

The workbook prices nearly the full legend-driven finish package and 737.33 lm of skirting.

Run 3

Run 3 recovered most finish scope, but TL3 stayed short and skirtings were still materially under the workbook.

Run 4

Run 4 keeps the broad finish recovery, restores TL3 to 184.1 m², and lifts skirting to 662.5 lm. This is the best floor package so far.

Call
Best so far
Pipeline improvement

Preserve the recovered family coverage, then trim the small C1 and VL2 review traces out of the bill output.

Category

Joinery and equipment

Human workbook

The workbook separates joinery packages from appliances and fitout equipment, which keeps pricing structured.

Run 3

Run 3 still mixed most of that scope back into Joinery and left the appliances implicit or unresolved.

Run 4

Run 4 creates a dedicated Equipment trade with 33 rows and massively expands Joinery detail. That is structurally closer to the workbook, but it is also too fragmented to price cleanly without regrouping.

Call
Closer, but over-split
Pipeline improvement

After extraction, regroup joinery subcomponents back into priceable assemblies while keeping appliances and loose equipment separate.

Category

Waterproofing

Human workbook

Bathroom floors and walls are measured explicitly at 229.9 m².

Run 3

Run 3 diagnosed waterproofing uncertainty, but still emitted no measured trade at all.

Run 4

Run 4 finally emits a waterproofing trade, including floor membrane, threshold waterstops and sealant, but it still misses most of the vertical wall membrane package.

Call
Partially back
Pipeline improvement

Extend wet-area recognition from floor membrane into wall membrane coverage so the full bathroom package reaches the bill.

Category

Painting and wall finishes

Human workbook

Painting is largely area-based and separated from wall-finish accessories and feature treatments.

Run 3

Run 3 had more usable painting area, but it still mixed direct pricing units with raw specials.

Run 4

Run 4 splits more of the finish package into dedicated wall-finish rows and acoustic-panel traces, which is richer evidence but less normalised for direct pricing.

Call
More evidence, less normalised
Pipeline improvement

Add a surface-conversion pass that turns height-coded finish rows into m² and parks the QA notes outside the priced bill.

Category

Signage

Human workbook

11 signage items are counted directly from schedule information.

Run 3

Run 3 missed signage entirely.

Run 4

Run 4 recovers one direct-stuck vinyl lettering item, but the rest of the schedule is still absent.

Call
Still mostly missing
Pipeline improvement

Treat signage as a dedicated counted schedule instead of relying on generic extraction to surface it incidentally.

Category

Services and commercial wrapper

Human workbook

Consultants, temporary services and MEP fallback allowances are built into the estimate so the commercial structure is complete.

Run 3

Run 3 remained thin on allowances and left services as sparse review notes.

Run 4

Run 4 still behaves similarly. It is slightly clearer, but it still does not turn sparse services information into a workable provisional-sum structure.

Call
Still too thin
Pipeline improvement

Layer a controlled allowance pack on top of the improved architectural takeoff so the estimate behaves like a real QS workbook.

Category

Bill hygiene and QA traces

Human workbook

The workbook is a clean commercial bill, not a blend of output plus diagnostics.

Run 3

Run 3 had fewer flags than run 4, but it also had major leaked reconciliation rows inside Tiling.

Run 4

Run 4 reduces the size of those leaks, but it raises many more QA traces, code-review placeholders and validator items. That is better for debugging, worse for direct pricing.

Call
Safer, but noisier
Pipeline improvement

Keep the diagnostics, but publish them into a QA layer rather than the same output stream as the bill items.

Finish-family evidence

Run 4 keeps the strong floor package, but still leaks review traces

On floors, the story is mostly positive. The remaining problems are now less about missing whole families and more about boundary errors or QA placeholders showing up in the bill.

Family Human Run 3 Run 4 Call Read
C1 18.18 m² 18.20 m² 18.20 m² + 1 review item Recovered, with trace The measured quantity is still right, but run 4 also emits a visible review placeholder that should stay out of the bill.
CP1 272.54 m² 272.50 m² 272.50 m² Stable Still one of the cleanest and most reliable families in the whole pipeline.
CP2 30.94 m² 29.59 m² 29.59 m² Stable Run 4 keeps the recovered carpet-tile family intact.
CP3 44.35 m² 44.40 m² 44.40 m² Stable Feature carpet tile coverage remains strong.
TL2 163.50 m² 163.62 m² 163.62 m² Stable Main floor tile coverage stays very close to the workbook.
TL3 183.03 m² 114.90 m² 184.10 m² Recovered This is a meaningful run-4 gain. The bathroom wall-tile package is now back in line with the workbook.
VL1 364.78 m² 484.49 m² 484.49 m² Still over The family remains over-expanded. Run 4 does not solve this boundary issue.
VL2 19.62 m² 19.70 m² 19.70 m² + 1 review item Stable, with trace The measured quantity is right, but a visible code-review trace still leaks into the output.
VD2 / WD2 75.08 m² 51.50 m² 51.50 m² Still partial The timber / vinyl family is still under-measured against the workbook.
DEM make-good Not part of new-finish pricing 760.0 m² inside Demolition 760.0 m² inside Demolition Still fixed The correct namespace from run 3 is preserved, which keeps the replacement-finish totals honest.
Context notes

Why run 4 is stronger, but still not clean

i

Run 4 is the strongest overall pass so far if you judge it as a workbook proxy rather than as a perfectly clean bill. Doors, floors, equipment and partial waterproofing all move in the right direction together.

i

The pipeline appears to have stepped back from the unstable family-grouping strategy and returned to explicit schedule rows where needed. That is especially visible in the recovered 91-door schedule.

i

The remaining problem is separation of concerns. Run 4 is blending bill items, QA traces and code-review notes into the same output stream, which makes it more useful for debugging than for direct pricing.

Overall judgement

Best workbook proxy so far, but still not a clean bill

Run 4 is the strongest overall Railway Road pass to date because it improves the door schedule, keeps the recovered floor package, splits equipment out properly, and finally starts measuring waterproofing. If the goal is to review and price with light QS cleanup, this is progress. If the goal is zero-touch pricing, it is still not there.

Practical implication

Keep the richer extraction, then clean the handoff layer

The right next move is not to simplify the extractor again. Keep the recovered detail, but separate diagnostics from bill output and regroup the over-split trades into pricing-friendly packages.

Priorities

What to fix next

1. Keep the explicit door schedule and suppress validator traces

Run 4 proves that explicit openings are safer than family reconciliation. The next step is to keep that mode and stop the validator leftovers from surfacing in Tiling.

2. Regroup the exploded joinery back into priceable packages

The extraction is now rich enough. What is missing is a packaging layer that turns all those subcomponents into the same practical joinery groupings a QS workbook expects.

3. Finish the waterproofing trade

Floor membrane, thresholds and sealant are now present. The next gain is to add the vertical membrane and any ancillary wet-area wall coverage so the package matches the workbook.

4. Keep the recovered finish families, but tighten boundary logic

TL3 is fixed, but VL1 is still too large and VD2 / WD2 is still too small. The finish-family guardrails now need to catch overshoots and undershoots together.

5. Separate QA output from bill output

Run 4 contains useful diagnostics, but those placeholders and validator traces should live in a review layer, not inside the priced takeoff itself.

6. Rebuild signage and the commercial wrapper

Those remain the consistent weak spots. The architecture is improving faster than the allowance and schedule-conversion logic that a real estimate still needs.