How Bilby works
Trenches, pipes and cables on the plot
One shared trench, several services
On-plot distribution prices a coordinated excavation route, service pipes/cables and terminations between boundary and house. Its parent subtotal owns those detail rows. The current reference starts from an editable assumed 25 m route; it does not measure a utility line drawn in the planner. That length is separate from the network distance used for an electricity connection.
When the budget shows a stored utilities estimate
An older project can show “Stored utilities estimate” when it has a saved combined amount but lacks a complete pair of separate water/wastewater and electricity estimates. This is a broad utilities total, not just the trench-and-distribution subtotal described below. While it is selected, Bilby treats the core water/wastewater, electricity, fibre, stormwater, on-plot distribution and other utility rows as covered by that stored amount, so they add no separate cost. That accounting rule does not prove what the original supplier or analysis included. Missing detail stays missing; Bilby does not invent a service-by-service allocation. The saved amount may come from an older calculation whose derivation is unavailable. Neither the default 25 m route nor a reference receipt explains how that historical amount was calculated. For example, a fictional stored fixed total of 300,000 SEK remains 300,000; the separate 63,875 SEK distribution example below is not added to it or claimed as one of its known components. Check the original scope before replacing the combined amount with separate scoped prices. When both separate water/wastewater and electricity estimates are available, the dashboard uses the detailed path instead of this stored total.
Ordinary customer-side work
The trench includes excavation, bedding, backfill and ordinary reinstatement once. Water and gravity wastewater pipes, electricity cable/conduit, fibre duct/draw-line and ordinary joints/testing/penetrations are then priced as material/installation scopes in that open route. Public connection fees, a private well/treatment system and internal house installations are elsewhere. Rock, long separate routes and extraordinary reinstatement need additional scoped review. Municipal VA or operator packages can already own some of this work.
Route and ownership inputs
Replace the assumed length with a realistic route estimate without treating it as surveyed engineering.
| Input | Unit | Origin |
|---|---|---|
| Shared route | m | Editable assumed 25 m by default |
| Applicable services | scope | Project and package inclusions |
| Termination package | one | Fixed ordinary allowance |
| Accepted contractor quote | SEK | User replacement |
| Separate or included work | scope | Budget ownership rules |
Setup plus route rates
Low/expected/high trench setup is 3,000/6,000/12,000 SEK and excavation 450/850/1,600 SEK/m. Service rates per metre are water 150/275/450; wastewater 220/400/700; electricity 150/300/550; fibre conduit 40/90/170. Terminations add 5,000/10,000/20,000. The parent sums applicable children after package exclusions; it is not added again to those children. There is no extra excavation multiplier per service. If a parent already holds an actual price, the reference breakdown is explanatory and should not be misrepresented as the derivation of that quote.
Illustrative 25 m shared route
With fictional 25 m routes for all four services, expected trench is 6,000 + 25 × 850 = 27,250 SEK. Pipes/cables are 6,875 + 10,000 + 7,500 + 2,250, and terminations 10,000: total 63,875 SEK. Low/high are 33,250/118,750. If the water pipe is included in a supplier package, remove that owned component from this subtotal; do not remove the shared trench unless it too is included.
Shared does not mean technically interchangeable
The budget does not design pipe falls, separation, frost protection or utility-owner requirements. Low/high vary ordinary procurement and installation conditions; difficult access or separate corridors can exceed them. Updating a saved assumption recalculates its reference components, but authoritative project quantities and package ownership take precedence. Have the relevant contractors coordinate the actual route and identify overlaps in the municipal/private connection package.
Method and price scope
Code reviewed 18 October 2026; national distribution references researched 16 September 2026. These are modelled coordinated-work allowances, not a local contractor tariff. Elsäkerhetsverket’s company register helps check electrical contractors; it is not evidence for the cable price coefficients. Use the project receipt to distinguish technical/quantity evidence from price evidence.
The review date covers this explanation and its implemented method. Price and data dates are stated separately in the article.