Road and Bridge Construction Estimating
We estimate road, highway and bridge work from your plans — earthwork, pavement structure, drainage, bridge and retaining structures — priced against the agency's unit-price bid schedule item by item, with traffic control and phasing quantified as the major cost they are on any project in a live corridor.
Get a Free QuoteTraffic Control Is a Major Cost, Not an Overhead
On any project in a live traffic corridor, maintenance of traffic can rival a construction package.
It runs for the whole project. Every day of the programme, through every phase, with the setup changing as the work moves. It is not a one-time installation.
It changes with every phase. Each stage of a phased road project has its own traffic control plan, its own devices and its own setup and removal. A five-phase project has five traffic control installations.
It drives the productivity of everything else. Working in a lane closure with live traffic beside you, at night, with restricted access and limited storage is a fraction of open-site productivity.
So it is quantified from the plans by phase. Rather than carried as a lump or a percentage. The traffic control plan sheets are a quantity document and they are read as one.
What We Quantify
Earthwork. Cut and fill from the cross sections with bank, loose and compacted volumes kept distinct, plus borrow, disposal, haul distance, undercut and embankment construction.
Pavement structure. Each course by area and thickness converted to tonnage, subbase and base, subgrade preparation, and the milling and removal on rehabilitation projects.
Drainage. Pipe by size and material, inlets, manholes, culverts, headwalls, underdrain and the outfall structures, with the excavation and backfill each carries.
Bridge structures. Foundations and piles, abutments, piers, bearings, girders or beams, deck, barrier, approach slabs, joints and the bridge deck overlay or wearing surface.
Retaining and earth retention. Retaining walls by face area and type, MSE walls, soldier pile and lagging and any permanent shoring left in place.
Traffic control and phasing. By phase from the traffic control plans — devices, barrier, temporary pavement, temporary signals, flagging, signage and the setup and removal for each stage.
Pavement markings and signage. Striping by length and material, symbols and legends by count, permanent signage, and any intelligent transportation system infrastructure.
Erosion control and environmental. Installation plus the maintenance obligation through the project duration, dewatering and treatment, and any permit-driven monitoring or restricted work window.
Where Heavy Civil Estimates Go Wrong
Traffic control carried as a lump
It is a phased, plan-drawn quantity that runs the whole project and changes with every stage. A lump sum cannot reflect a five-phase programme and is systematically low on the complex projects.
Night work productivity assumed equal
Much urban road work happens at night under restricted conditions with setup and removal each shift. Productivity is a fraction of daytime open-site work and the shift differential is real.
Swell and shrink carried as one number
Bank, loose and compacted are three volumes for the same soil. One number produces a haul quantity that is short and a borrow quantity wrong in the other direction.
Bridge deck and approach detail underestimated
Joints, bearings, barrier, approach slabs and deck overlay carry a large share of a bridge cost relative to their quantity, and they are the items most often carried loosely.
Utility conflicts assumed absent
Buried utilities in a road corridor are extensive and the records are reliably incomplete. Locating, supporting, protecting and occasionally relocating them is slow work in a constrained trench.
Restricted work windows ignored
Environmental permits, seasonal restrictions, event closures and agency-imposed lane availability all constrain when work can happen, and a programme that ignores them is not buildable.
What Moves a Heavy Civil Number
Phasing complexity. The number of stages and how traffic is maintained through each is the biggest schedule and cost driver on a corridor project, and it multiplies the traffic control and the mobilisation.
Earthwork balance and haul. Whether the project balances cut and fill on site, or imports and exports, and over what distance. Haul is a cycle cost and the distance is decisive.
Structure content. A project with a bridge is a different project. Foundations, piles, structural concrete and steel, and the specialised crews and equipment they need, sit outside the pavement work entirely.
Subsurface conditions. Rock, groundwater and unsuitable material under a pavement or a structure foundation are the largest unknowns, and they come from the geotechnical report rather than the plans.
Utility conflicts. Extent and depth of existing utilities in the corridor, and whether relocation is in the contract or being handled by the utility owner on its own schedule.
Agency requirements and specifications. Which agency's standard specifications apply changes materials, testing frequency, documentation and inspection, and those differences are real cost rather than paperwork.
Trades on a Road or Bridge Project
Heavy civil rather than building trades.
What You Receive
- An estimate priced against the agency's unit-price bid schedule item by item
- Earthwork with bank, loose and compacted volumes kept distinct and factors stated
- Traffic control quantified by phase from the traffic control plans
- Bridge structures estimated as their own package with joints, bearings and barrier carried explicitly
- Erosion control with the maintenance obligation over the project duration
- A marked-up plan set showing where every quantity came from
- An assumptions schedule, including anything assumed about rock, groundwater and utility conflicts
- The pricing basis and the date that basis was current
Documents We Need
- Plan and profile sheets and typical sections
- Cross sections, for earthwork volumes
- The bid schedule with items, units and estimated quantities
- Structural plans for any bridge or retaining structure
- Traffic control plans for every phase
- Geotechnical report, for rock, groundwater, unsuitable material and foundation design
- Drainage plans and hydraulic information
- Utility information and any relocation agreements
- The applicable agency standard specifications
- Environmental permit conditions and any restricted work windows
Tools and Standards
Quantities, rates and assemblies are read against the published references that govern this work. Where a project specification conflicts with any general reference, the specification governs:
- The applicable state DOT standard specifications and standard drawings
- AASHTO LRFD Bridge Design Specifications
- AASHTO materials and construction standards
- MUTCD — temporary traffic control and work zone requirements
- ASTM D698 / D1557 — compaction testing
- The agency's own bid item structure, which governs how the estimate is organized
Bridge Work Is Its Own Estimate
A structure inside a road project behaves nothing like the pavement around it.
Foundations are the unknown. Piles or drilled shafts to a bearing stratum, with the depth decided by the geotechnical report rather than the plans. Pile length overrun is the classic bridge cost risk.
Access and staging drive the method. Building over water, over a live roadway or over rail changes the erection method, the equipment and the working windows, and frequently costs more than the structure.
Deck detail carries disproportionate cost. Joints, bearings, barrier, approach slabs and the deck overlay are a large share of bridge cost relative to their quantity, and they are the items carried loosest.
Concrete and reinforcement are congested. Bridge substructures and decks are heavily reinforced with tight bar spacing and complex shapes, so placing labor per ton is far above building work.
Rehabilitation is different again. Deck replacement, widening and repair on an in-service bridge means staged construction under traffic, and the existing condition is never fully known until it is opened.
Inspection and testing are continuous. Materials testing, weld inspection, pile driving records and concrete testing run throughout, at a frequency the agency specification sets.
Frequently Asked Questions
How do you price traffic control?
By phase, from the traffic control plan sheets, as a quantity document rather than a lump sum. Maintenance of traffic runs the whole programme, changes with every stage, and on a five-phase corridor project that is five separate installations and removals — a lump sum cannot reflect any of it.
Do you price unit-price bid schedules?
Yes, item by item on its own basis against the agency's schedule. The estimated quantities are the owner's figures rather than a guarantee, and an item priced as a share of the total rather than on its own cost is how a heavy civil bid becomes unprofitable on a quantity swing.
Do you estimate bridges?
Yes, as their own package. Foundations and piles, substructure, bearings, girders, deck, barrier, joints and approach slabs — with the access and erection method priced, because building over water, a live roadway or rail frequently costs more than the structure itself.
How do you handle earthwork?
With bank, loose and compacted volumes kept distinct throughout and the swell and shrink factors stated on the face of the estimate, and haul priced by cycle rather than by volume. Carrying one number through all three states produces a haul quantity that is short and a borrow quantity wrong the other way.
Do you account for night work?
Yes, where the phasing requires it. Much urban road work happens at night under restricted conditions with setup and removal each shift, and the productivity is a fraction of daytime open-site work before the shift differential is even applied.
What about utility conflicts?
We carry locating, support and protection, and we state the assumption about relocation. Buried utilities in a road corridor are extensive and the records are reliably incomplete, so an estimate that assumes a clear trench is assuming the favourable answer on a known risk.
Send the plans and the bid schedule
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