Cost drivers
36% of the net sits in 25 items
The 25 largest items, 2.6% of the 974, add up to SEK 55.3 m. Half of the net sits in 47 items, while the 491 items below SEK 50,000 make up 8% together.
Detailed estimate Tranängen, bandel 421
The net estimate for the track and platform rebuild at Tranängen, broken down into 974 items by work package, cost type, sub-area and price certainty. The net is unchanged at SEK 152.4 m, and 36% of it sits in 25 items.
Summary
Price certainty
10 of the 25 cost drivers have no firm price
SEK 25.4 m of the cost drivers rests on budget quotes (7 items, including the four EV-60E-760-1:15 switches and the contact line subcontract) or on the estimator's judgement (3 items: mast foundations, contaminated soil and platform shelters).
Request firm quotes for these before the tender is submitted.
Unit rates
4 unit rates deviate more than 40% from the resource bank
Mast foundations work out at SEK 36,800 each against 20,600 in the resource bank (+79%). Ballast in sub-area 2 is +55%, platform edge installation +47% and the sub-base in sub-area 4 −46%.
Check the quantities and what each net line includes.
Detailed estimate by item
Each rectangle is one item, sized by amount and coloured by price certainty. Group by work package, cost type, sub-area or price certainty, click a group heading to open it and click an item to see its quantity, unit rate and basis. The Pareto curve shows how fast the net accumulates from the largest item down.
Group by
Show
Price certainty
974Items shown
0Amount shown
0Cost drivers shown
0Difference to net estimate rev B
All work packages
Faded items fall outside the current filter. Group areas follow the net estimate, so the treemap always adds up to SEK 152.4 m.
Pareto curve
Items sorted from the largest amount down, cumulative share of the net.
0of the net in the largest 25 items
0items make up half of the net
0items make up 80% of the net
Items, largest first
| Rank | Item | Description (as in the estimate) | Package · area | Quantity | Unit rate (SEK) | Amount (SEK) | Price certainty | Flag |
|---|
Check against the net estimate
Sum of the detailed items per work package compared with Nettokalkyl rev B.| Work package | Net estimate rev B (SEK) | Sum of items (SEK) | Items | Difference (SEK) | Largest item |
|---|
Sources and method
Sources
- Nettokalkyl_Bdl421_Tranängen_revB.xlsxNet estimate (nettokalkyl), one amount per work package AP01–AP10
- MF_Bdl421_Tranängen.xlsxBill of quantities (mängdförteckning, MF) from the tender documents, AMA Anläggning structure
- Offertsammanställning_material_Bdl421.xlsxQuote register: 34 firm quotes (O-26-…) and 26 budget quotes (BO-26-…)
- Resursbank_kalkyl_2026.xlsxThe company's experience rates (resursbank) with rate codes R-…
- AF_Bdl421_Tranängen.pdfAdministrative regulations (AF): sub-areas, track possessions, material supply by the contractor
Method
- Each work package amount in the net estimate was split into items using the MF quantities, the quotes and the resource bank, keeping the work package total fixed.
- Each item was coded by work package (arbetspaket), cost type (kostnadsslag 11–51, the company's own cost type codes), sub-area (delområde DO0–DO4, from the AF) and price certainty A–D.
- The unit rate of each item is its amount divided by its quantity. Where the resource bank has a rate for the same work, the two were compared.
- The items were sorted by amount and accumulated into the Pareto curve. The 25 largest are counted as cost drivers.
- The sum of the items was checked against the net estimate per work package. The difference is 0 kr in all ten.
Assumptions and limits
- Amounts are net costs excluding VAT, contractor's fee and risk, at the October 2026 price level.
- Price certainty: A firm quote, B non-binding budget quote, C experience rate from the resource bank, D estimator's judgement without a reference.
- A deviation of more than ±40% from the resource bank is flagged. A flag points to an item to check, not to an error.
- Item texts are kept as written in the estimate. Track possessions and the time plan have not been priced separately.
- Material supply follows this contract's AF: the contractor procures rail, sleepers and switches. On other Trafikverket contracts rail and switches can be client-supplied, which would take those items out of the estimate. The switch types EV-60E-760-1:15 and EV-60E-300-1:9 are Trafikverket standard single turnouts (TDOK 2013:0478). Unit rates for rail (about SEK 690/m), sleepers (SEK 640 each) and ballast (about SEK 250/t) come from the quotes and the resource bank and are the company's own pricing assumptions.