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title: "Construction Contract Types Fixed Price Cost-Plus | AVANORTH"
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AVANORTH Home
**Industry News**·April 29, 2026· 4 min read
# **Construction Contract Types: Fixed Price, Cost-Plus, and More**
The contract type defines how risk is shared between owner and contractor. Understanding fixed-price, cost-plus, GMP, unit price, and design-build delivery methods helps owners choose the right approach for their project.
**AVANORTH Team**
AVANORTH Construction
Every construction project needs a contract that defines the scope of work, the price, and the allocation of risk between the owner and the contractor. The contract type is one of the most consequential decisions an owner makes, because it determines who bears the risk of cost overruns, how changes are handled, and how the contractor is motivated. There is no universally "best" contract type; each has advantages in specific situations.
---
## Contract Types Comparison
| Contract Type | Price Certainty for Owner | Risk Allocation | Best When |
| --- | --- | --- | --- |
| Stipulated (fixed) price | Highest | Mostly on contractor | Scope is well-defined, complete drawings |
| Cost-plus (fee) | Lowest | Mostly on owner | Scope is undefined, fast-track, emergency |
| Cost-plus with GMP | Medium-High | Shared | Scope partly defined, collaborative approach |
| Unit price | Medium | Shared | Quantities are uncertain (excavation, paving) |
| Design-build | High | Mostly on design-builder | Owner wants single point of responsibility |
| CM at-risk | Medium-High | Shared | Complex projects, early contractor involvement |
---
## Stipulated (Fixed) Price
### How It Works
The contractor provides a lump sum price for the complete scope of work. The owner pays that amount regardless of the contractor's actual costs. If the contractor's costs come in under the price, the contractor keeps the savings. If costs exceed the price, the contractor absorbs the loss.
### Advantages and Disadvantages
| Advantages | Disadvantages |
| --- | --- |
| Budget certainty for the owner | Requires complete, detailed drawings and specifications before pricing |
| Easy to compare bids (apples to apples) | Change orders are contentious and often expensive |
| Contractor is motivated to control costs | Contractor may cut corners to protect margin |
| Simple administration | Risk premium increases the price (contractor includes contingency) |
> **Best for:** Projects with complete design documents, well-defined scope, and minimal expected changes. Typical for residential construction, small commercial, and standard building types where the scope is well understood.
---
## Cost-Plus (Fee)
### How It Works
The owner pays all actual costs of the work (labour, materials, subcontractors, equipment, overhead) plus a fee to the contractor. The fee can be a fixed amount, a percentage of costs (typically 10-20%), or a combination.
| Advantages | Disadvantages |
| --- | --- |
| Work can start before design is complete | No price certainty (open-ended) |
| Transparent: owner sees all costs | Owner bears all risk of cost overruns |
| No adversarial change order process | Contractor has no incentive to minimize costs (percentage fee rewards higher costs) |
| Best price (no risk contingency in the bid) | Requires owner to actively manage and audit costs |
---
## Cost-Plus with Guaranteed Maximum Price (GMP)
### How It Works
Like cost-plus, but the contractor guarantees that the total cost (including fee) will not exceed a maximum amount. If costs come in under the GMP, the savings are typically shared between owner and contractor (common split: 50/50 or 75/25 in favour of the owner). If costs exceed the GMP, the contractor absorbs the overage.
| Advantages | Disadvantages |
| --- | --- |
| Price ceiling provides budget protection | GMP is often set with incomplete design (includes contingency) |
| Shared savings incentivizes cost control | Scope definition at GMP stage can lead to disputes |
| Collaborative (contractor involved early) | More complex administration than fixed price |
| Can fast-track (start before design is complete) | Owner must trust and verify cost reporting |
> **The GMP Challenge:** The guaranteed maximum price is only as good as the scope definition it is based on. If the scope changes (and it almost always does), the GMP changes too. The key is a clear GMP scope document that defines exactly what is included and what triggers an adjustment.
---
## Unit Price
The contractor prices each item of work at a rate per unit (e.g., $X per cubic metre of excavation, $Y per linear metre of pipe, $Z per square metre of paving). The owner pays based on actual quantities installed, measured in the field.
- **Best for:** Work where quantities cannot be precisely determined in advance: excavation, grading, asphalt paving, underground utilities, environmental remediation
- **Risk:** The unit rates are firm, but the total price depends on actual quantities. Quantity risk is on the owner.
---
## Choosing the Right Contract Type
| Project Situation | Recommended Contract Type |
| --- | --- |
| Complete drawings, well-defined scope, competitive market | Stipulated price |
| Emergency repairs, poorly defined scope, need to start immediately | Cost-plus |
| Large project, want early contractor input, budget ceiling needed | Cost-plus with GMP |
| Underground work, earthwork, quantities unknown | Unit price |
| Want single point of responsibility, design and construction | Design-build |
| Complex project, multiple phases, need pre-construction services | CM at-risk |
> **AVANORTH Guidance:** For most residential and small commercial projects, we use stipulated price contracts because they provide budget certainty for our clients. We invest the time upfront to develop complete scope documents so the price is accurate and change orders are minimized. For larger or more complex projects, we discuss GMP or CM-at-risk arrangements where early collaboration adds value. We always recommend that the contract clearly define the scope, the process for changes, and the dispute resolution mechanism before work begins.
#contracts #project-management #business
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