Choosing a building contractor is one of the most important decisions you'll make during a construction or renovation project.
A good contractor can turn drawings and specifications into a well-built finished project while coordinating labour, materials, subcontractors, schedules and countless practical decisions.
The wrong contractor can create delays, disputes, poor workmanship and unexpected costs.
Unfortunately, reliability isn't something you can determine from a professional-looking quotation or website alone.
Finding the right contractor requires some investigation before any agreement is signed or deposit is paid.
Start With a Clearly Defined Project
It is difficult to compare contractors when the project itself isn't properly defined.
Before requesting quotations, establish what work needs to be completed.
Depending on the project, this may require:
- Architectural drawings
- Engineering information
- Specifications
- Schedules
- Approved plans
- Scope-of-work documents
The more accurately the project is documented, the easier it becomes for contractors to price the same work.
Without clear information, quotations may be based on different assumptions.
Ask Your Architect or Professional Team
If an architect, quantity surveyor, engineer or project manager is involved, ask whether they can recommend suitable contractors.
Construction professionals often have experience with contractors from previous projects and may know who is appropriate for the scale and complexity of the work.
A recommendation shouldn't replace proper checks.
However, previous professional experience can provide a useful starting point.
Ask People Who Have Recently Built or Renovated
Personal recommendations can also be valuable.
Speak to people who have completed similar projects recently.
Don't simply ask:
"Was the contractor good?"
Ask more specific questions:
- Was the project completed reasonably close to schedule?
- How were problems handled?
- Were there unexpected costs?
- Was communication good?
- Was the site properly managed?
- Would you use the contractor again?
The answers often provide considerably more useful information than a simple recommendation.
Look for Relevant Experience
A contractor may be excellent at one type of construction and unsuitable for another.
Building a new commercial development requires different experience from renovating a small residential property.
Ask whether the contractor has completed projects involving similar:
- Scale
- Construction methods
- Materials
- Complexity
- Budgets
- Building types
Relevant experience reduces the amount of unfamiliar territory the contractor needs to deal with during your project.
Ask to See Completed Projects
Photographs are useful, but seeing completed work can provide more information.
Where practical and with the owner's permission, ask whether you can view previous projects.
Pay attention to:
- Finishing quality
- Junctions between materials
- Doors and windows
- Tiling
- Joinery
- Paintwork
- General workmanship
Some defects only become apparent after a building has been occupied for a while.
This is why older completed projects can sometimes be more informative than a site finished last week.
Visit a Current Construction Site
A contractor's active building site can reveal a great deal about how they operate.
Look at whether the site appears:
- Organised
- Appropriately supervised
- Reasonably tidy
- Safely managed
- Professionally run
Construction sites will naturally contain materials, equipment and unfinished work.
The question isn't whether the site looks pristine.
It is whether there appears to be a system behind the activity.
Speak to Previous Clients
Ask contractors for references from recent clients.
Then actually contact them.
Useful questions include:
- Was the contractor reliable?
- How was communication?
- How were changes handled?
- Were costs explained clearly?
- How were defects addressed?
- Did the contractor return after completion when necessary?
- Would you hire them again?
Try to speak to more than one client.
One successful project doesn't necessarily represent the contractor's normal performance.
Ask About Projects That Had Problems
Every experienced contractor eventually encounters a difficult project.
Construction involves weather, supply problems, design changes, unexpected site conditions and many other complications.
A contractor claiming that nothing has ever gone wrong deserves further questioning.
Ask for an example of a project where a serious problem occurred and how it was resolved.
The response can tell you a great deal about the contractor's approach to responsibility and problem-solving.
Verify Business Details
Before entering into a significant construction contract, confirm that you're dealing with a legitimate business.
Depending on the contractor and project, check information such as:
- Registered business name
- Physical address
- Contact information
- Company registration details
- Tax information where relevant
- Banking details
Be cautious when documentation contains inconsistent business names or when payment is requested into unrelated personal accounts without a reasonable explanation.
Check Applicable Registrations
Depending on the nature and location of the project, particular registrations or statutory requirements may apply.
In South Africa, residential building projects may involve requirements relating to bodies such as the National Home Builders Registration Council (NHBRC), depending on the project.
Other construction activities may have additional regulatory or professional requirements.
Confirm which requirements apply to your specific project rather than assuming every contractor needs exactly the same registrations.
Check Insurance
Ask what insurance the contractor carries.
Depending on the project and contractual arrangements, relevant insurance may include cover relating to:
- Construction works
- Public liability
- Employees
- Equipment
- Other project risks
Don't simply accept the statement that the contractor is "fully insured."
Ask for details and confirm that the cover is appropriate for the project.
Your professional team or insurance adviser can assist where the arrangements are complex.
Compare More Than One Contractor
Unless there is a strong reason not to, obtain quotations from several suitable contractors.
This provides useful context around:
- Pricing
- Construction periods
- Exclusions
- Allowances
- Proposed methods
However, inviting too many contractors to quote can become counterproductive.
A shortlist of credible companies with genuine interest in the project is generally more useful than collecting a large number of poorly considered prices.
Give Contractors the Same Information
Fair comparison requires each contractor to price substantially the same scope.
Provide the same drawings, specifications and schedules to everyone invited to tender.
If one contractor prices a fully specified project while another is working from a basic sketch, the quotations won't be directly comparable.
Record clarifications and distribute important information consistently where appropriate.
Don't Automatically Choose the Cheapest Quote
The lowest quotation can be attractive, particularly when construction costs are already higher than expected.
But a very low price deserves careful investigation.
It may result from:
- Missing work
- Incorrect quantities
- Unrealistic allowances
- Different material assumptions
- Misunderstood drawings
- Deliberate underpricing
The cheapest tender at the beginning can become the most expensive project by completion if important items were omitted.
Be Suspicious of a Price Far Below the Others
If three credible contractors provide relatively similar prices and one quotation is dramatically lower, investigate why.
The low contractor may have identified a legitimate saving.
They may also have missed something substantial.
Ask the contractor to confirm the scope and explain major differences.
A quotation should make commercial sense for both the client and contractor.
A contractor who cannot complete the work profitably creates risk for everyone involved.
Review What the Quote Includes
A quotation should provide enough detail to understand what you're buying.
Depending on the project, review items such as:
- Labour
- Materials
- Site establishment
- Subcontractors
- Equipment
- Waste removal
- Temporary works
- Finishes
- Allowances
- Taxes
The appropriate level of detail depends on the project's scale.
A one-page figure for a major construction project may not provide enough information to understand how the price was calculated.
Pay Attention to Exclusions
What isn't included can be just as important as what is.
A quotation may exclude items such as:
- Electrical work
- Plumbing fixtures
- Landscaping
- Specialist installations
- Professional fees
- Municipal charges
- Certain finishes
Exclusions aren't necessarily a problem when they are clearly identified.
Problems occur when the client assumes something is included and only learns later that it isn't.
Understand Allowances
Some items cannot be priced exactly before construction because the final product hasn't been selected.
The contractor may therefore include allowances.
For example, the budget might contain an amount for tiles that will be selected later.
If the eventual tiles cost more than the allowance, the project cost increases.
Understand which amounts are fixed and which may change.
Unrealistically low allowances can make an initial quotation appear cheaper than the likely final cost.
Compare Quotations Line by Line
Don't compare only the total at the bottom.
Review quotations in detail.
If one contractor is substantially cheaper for a particular section, ask why.
Likewise, if another is much more expensive, there may be a legitimate difference in specification or scope.
A quantity surveyor can be particularly useful on larger projects because they can analyse tenders and identify inconsistencies.
Ask Who Will Actually Manage the Site
The person who meets you during the tender process may not be the person managing construction every day.
Ask:
- Who is the site manager?
- How often will the contractor visit?
- Who is responsible for daily supervision?
- Who will communicate with the professional team?
- Who can make decisions?
Good supervision is critical to construction quality.
A contractor running too many sites simultaneously may struggle to give your project sufficient attention.
Ask How Many Projects They Are Currently Running
Being busy can indicate that a contractor is in demand.
Being overloaded can create problems.
Ask about current commitments and upcoming projects.
Consider whether the contractor realistically has:
- Enough staff
- Appropriate supervision
- Equipment
- Cash flow
- Management capacity
A capable contractor can still perform poorly if they accept more work than the business can manage.
Meet the People You'll Be Working With
Construction projects can last months or even years.
Communication matters.
Meet the project manager, site manager or other people who will be involved regularly.
You don't need to become friends.
You do need to feel that communication can remain professional when disagreements or problems occur.
The real test of a working relationship usually comes when something doesn't go according to plan.
Ask About Subcontractors
Many contractors rely on specialist subcontractors for parts of the work.
These may include:
- Electricians
- Plumbers
- Waterproofing specialists
- Joiners
- Tilers
- Roofers
Ask whether the contractor uses established subcontractors or assembles a new team for each project.
Long-standing working relationships can sometimes contribute to better coordination and predictable workmanship.
Clarify Responsibility for Subcontractors
Understand who appoints and manages subcontractors.
If the main contractor is responsible, communication should generally flow through the agreed contractual structure.
Directly instructing subcontractors without involving the main contractor can create confusion around responsibility, payment and changes.
Your architect or project manager can help establish appropriate communication procedures.
Ask for a Construction Programme
Before starting, request a realistic programme showing major stages of work.
Depending on the project, these might include:
- Site establishment
- Foundations
- Structure
- Roofing
- Services
- Plastering
- Finishes
- Practical completion
Construction programmes will change when legitimate delays occur.
Their value is that they provide a baseline against which progress can be monitored.
Ask How Delays Are Handled
Delays happen.
Bad weather, material shortages, design changes and unforeseen conditions can affect programmes.
Ask how the contractor records and communicates delays.
A reliable contractor should identify problems early rather than waiting until the completion date to explain why the project is several months behind.
Always Use a Written Contract
A handshake is not an adequate arrangement for a substantial construction project.
Use an appropriate written building contract.
The contract should address matters such as:
- Scope of work
- Contract value
- Payment
- Programme
- Variations
- Delays
- Insurance
- Defects
- Dispute procedures
- Completion
The appropriate contract depends on the nature and scale of the project.
Professional or legal advice may be appropriate before signing.
Don't Pay the Entire Contract Price Upfront
Payment arrangements should reflect the project and contract.
Be cautious about requests for the entire construction value before work begins.
Construction payments are commonly linked to agreed stages, valuations or certified progress depending on the contractual arrangement.
Deposits may be appropriate in some circumstances, particularly where materials need to be ordered.
The amount and purpose should be clearly documented.
Understand Progress Payments
Progress payments should correspond with work completed and, where applicable, materials properly accounted for.
On professionally administered projects, an architect, quantity surveyor or other contract administrator may assess work before payment becomes due.
This helps provide some independent oversight.
Clients should understand the payment mechanism before construction starts rather than negotiating it during the project.
Keep a Contingency
Even with a reliable contractor and excellent documentation, construction can produce unexpected costs.
Existing buildings can conceal problems.
Ground conditions can differ from expectations.
Clients may also change their minds during construction.
A contingency provides financial room for legitimate unforeseen costs.
The appropriate amount depends on the project and level of uncertainty.
Control Variations Carefully
Changes during construction are one of the most common causes of cost increases.
A seemingly simple request such as moving a wall can affect:
- Electrical work
- Plumbing
- Flooring
- Ceilings
- Joinery
- Painting
Where possible, understand the cost and programme implications before approving a variation.
Keep instructions documented.
Verbal changes can easily lead to disputes about what was requested and what it should cost.
Don't Judge Reliability Only by Personality
A confident, friendly contractor can make a strong first impression.
That isn't the same as construction competence.
Likewise, a quieter contractor may run an excellent operation.
Base the decision on evidence:
- Previous projects
- References
- Documentation
- Experience
- Pricing
- Capacity
- Site management
Good communication matters, but it should support proven capability rather than replace it.
Watch for Poor Communication Before Appointment
The tender period provides an early indication of how the contractor communicates.
Pay attention if they repeatedly:
- Miss meetings
- Ignore questions
- Submit information late
- Provide vague answers
- Fail to return calls
Construction won't necessarily make these habits improve.
A contractor doesn't need to respond instantly to every message, but important communication should be handled professionally.
Be Cautious About Unrealistic Promises
A contractor who promises to complete the project dramatically faster than everyone else should be able to explain how.
Likewise, be cautious about guarantees that there will be no unexpected issues whatsoever.
Construction contains uncertainty.
Reliable contractors generally acknowledge this and explain how they manage risk rather than pretending it doesn't exist.
Don't Start Before the Documentation Is Ready
Clients are often eager to begin construction.
Starting before drawings, approvals and specifications are sufficiently developed can create expensive uncertainty.
Contractors may need to stop while waiting for information, or work may have to be changed after decisions are finalised.
A few extra weeks spent preparing properly can sometimes prevent months of difficulty later.
Make Sure Necessary Approvals Are in Place
Before construction begins, confirm which permissions and approvals are required.
Depending on the project, these may involve:
- Municipal approvals
- Building plans
- Heritage requirements
- Estate approvals
- Environmental permissions
- Other statutory processes
Starting work without required approvals can create delays, penalties or problems when the property is eventually sold.
The relevant professional team should advise on project-specific requirements.
Don't Ignore Health and Safety
Construction sites involve genuine hazards.
Contractors should take health and safety responsibilities seriously and comply with applicable requirements.
During contractor selection, ask about:
- Site safety procedures
- Protective equipment
- Supervision
- Required documentation
- Incident management
A contractor who treats basic safety as unnecessary bureaucracy may demonstrate the same attitude towards other project responsibilities.
Keep Communication Documented
Important decisions should be recorded.
Email, meeting minutes and formal site instructions can provide a clear record of:
- Changes
- Decisions
- Costs
- Delays
- Responsibilities
This doesn't mean every casual conversation needs legal documentation.
However, decisions affecting money, programme or scope should not rely entirely on memory.
Hold Regular Site Meetings
For larger projects, regular site meetings can help keep everyone aligned.
Meetings may cover:
- Progress
- Programme
- Design information
- Variations
- Costs
- Quality
- Outstanding decisions
Minutes should record important actions and responsibilities.
Regular communication helps identify problems while there is still time to deal with them.
Inspect Work During Construction
Don't wait until completion to assess workmanship.
Certain work becomes hidden as construction progresses.
Foundations disappear underground. Waterproofing gets covered. Services are enclosed inside walls and ceilings.
Appropriate inspections by architects, engineers or other professionals can identify issues before later work conceals them.
The contractor remains responsible for their contractual obligations, but professional oversight provides an additional layer of control.
Understand the Defects Process
Even good construction projects can have defects requiring correction.
The contract should establish how these are identified and addressed.
Near completion, the professional team may prepare a list of incomplete or defective items.
The contractor should then be given the opportunity to correct work according to the contractual process.
Don't treat practical completion as the moment when all communication with the contractor ends.
Find Out How the Contractor Handles After-Sales Issues
Ask previous clients what happened after construction ended.
Did the contractor return to deal with legitimate defects?
Or did communication stop as soon as the final major payment was made?
A contractor's willingness to address valid post-completion issues is an important part of reliability.
Warning Signs to Watch For
No single warning sign automatically proves that a contractor is unsuitable, but several together deserve caution.
Potential red flags include:
- Refusing to provide references
- No verifiable project history
- Extremely low pricing without explanation
- Pressure for unusually large upfront payments
- Vague quotations
- Constantly changing business details
- Reluctance to sign a contract
- Poor communication
- Unrealistic completion promises
If something doesn't make sense, investigate before committing.
What Makes a Good Contractor?
A reliable contractor isn't necessarily the cheapest, biggest or most impressive company.
Good contractors generally demonstrate a combination of:
- Relevant experience
- Financial and operational capacity
- Clear communication
- Competent supervision
- Transparent pricing
- Appropriate documentation
- Good references
- Consistent workmanship
They should also be willing to ask questions.
A contractor who identifies gaps or contradictions in the documentation may be demonstrating greater care than one who simply provides a price without clarification.
Final Thoughts
Finding a reliable building contractor requires more than comparing quotations.
Start with a clearly defined project, identify contractors with relevant experience and investigate their previous work.
Speak to former clients. Visit completed projects where possible. Review current sites. Check applicable registrations, insurance and business information.
Then compare quotations carefully.
Look beyond the total price to understand inclusions, exclusions, allowances, programme and payment arrangements.
Once you've selected a contractor, put the agreement in writing and establish clear procedures for payments, variations, communication, delays and defects.
No selection process can guarantee that a construction project will run without problems.
Construction is too complex for that.
What careful contractor selection can do is reduce avoidable risk and give the project a team capable of dealing professionally with the problems that inevitably arise.
The best contractor isn't simply the one who promises the lowest price or fastest completion.
It is the one with the experience, capacity, systems and track record to deliver the project you are actually planning.
