1. Starting Construction Without a Proper Building Design
One of the biggest mistakes is beginning construction with nothing more than a sketch, an idea or a picture downloaded from the internet.
A building is more than its external appearance.
Before construction begins, you need properly developed drawings showing how the building is intended to function and how it is expected to be constructed.
Depending on the project, this may include:
- Architectural drawings
- Structural drawings
- Electrical drawings
- Plumbing drawings
- Site development plans
- Details and specifications
Without proper documentation, different people on the site may interpret the building differently.
This can lead to incorrect dimensions, unnecessary alterations, material wastage and expensive corrections.
The lesson:
Don't build first and figure out the details later. Design first, then build according to the design.
2. Choosing a Building Design Simply Because It Looks Beautiful
A house can look beautiful on social media and still be completely unsuitable for your land, budget or lifestyle.
Many prospective homeowners save pictures of impressive houses they see online and ask a designer or contractor to reproduce them without considering the actual site conditions.
But a good building design must respond to factors such as:
- Plot size and shape
- Site orientation
- Access
- Setbacks
- Drainage
- Natural lighting
- Ventilation
- Privacy
- Local planning requirements
- Budget
- Structural requirements
A design that works perfectly on a large urban plot may not work efficiently on a smaller or irregular site.
The objective should not be to copy another person's house.
The objective should be to create a building that works for your land, your needs and your budget.
3. Building Without Understanding the Site
The land you bought may look perfectly fine from the surface, but that does not tell you everything about the ground beneath it.
Soil conditions can influence foundation design and ultimately affect construction cost.
This is particularly important where there may be:
- Weak soil
- Waterlogged ground
- Filled land
- Expansive soil
- Poor drainage
- Significant changes in ground level
The appropriate foundation system should be determined by the building design, structural requirements and actual site conditions.
That is why professional site investigation and engineering assessment should not be treated as unnecessary expenses.
Remember:
Money spent understanding your site before construction can prevent much larger expenses during construction.
4. Starting With a Budget That Has No Proper Cost Breakdown
“I have ?60 million; let's start.”
This sounds simple, but it is not a construction plan.
A building budget should be based on the actual scope of work.
You need to understand how much of your money may be required for:
- Foundation
- Blockwork
- Reinforcement
- Concrete
- Roofing
- Doors and windows
- Electrical installation
- Plumbing
- Plastering
- Tiling
- Painting
- Ceiling
- Kitchen and wardrobes
- External works
- Labour
- Other project requirements
A professional Bill of Quantities (BOQ) or detailed cost estimate can help break the project into measurable components.
This makes it easier to identify where your money is going and control expenditure throughout construction.
Don't ask only:
“How much can I spend?”
Ask:
“What exactly can I build with the amount I have?”
That difference can save you millions of naira in poor decisions.
5. Choosing a Contractor Based Only on the Lowest Price
Price matters.
But price alone should never be the only factor you consider when choosing a contractor.
Two contractors may submit completely different quotations for the same building because they may be using different assumptions about:
- Material quality
- Labour
- Workmanship
- Project duration
- Construction methods
- Finishing standards
- Scope of work
A quotation that appears cheaper may eventually become more expensive if it contains omissions, unrealistic allowances or poor-quality specifications.
Before engaging a contractor, consider:
Experience: Have they successfully handled similar projects?
Technical competence: Do they understand the drawings and construction requirements?
Previous work: Can they demonstrate completed projects?
Transparency: Is their quotation clear?
Supervision: Who will actually be responsible for the work on site?
Documentation: Are drawings, specifications and agreements properly documented?
A professional contractor should be able to explain not only what the project will cost, but also what you are getting for that money.
6. Making Major Design Changes During Construction
Imagine completing your foundation and part of the blockwork before deciding:
“Let's add another room.”
Or reaching the roofing stage and suddenly deciding to change the roof design.
These changes can become extremely expensive.
They may require:
- Demolition
- Additional materials
- Additional labour
- Structural modifications
- Rework
- Construction delays
Some changes may also affect other parts of the building.
For example, moving a staircase can affect floor layouts. Changing room positions can affect plumbing and electrical installations. Adding additional spaces can affect structural requirements and foundation design.
The better approach:
Spend enough time developing and reviewing your design before construction begins.
Changes are generally easier and cheaper on paper than on a construction site.
7. Neglecting Professional Supervision
Having drawings is important.
Having materials is important.
Having workers is important.
But someone still needs to ensure that the work being executed actually corresponds with the approved drawings and specifications.
Professional supervision can help monitor:
- Setting out
- Foundation works
- Reinforcement placement
- Concrete works
- Blockwork
- Wall alignment
- Roofing
- Plumbing
- Electrical installation
- Finishes
- General workmanship
It can also help identify problems before they become difficult and expensive to correct.
A building project should not be left entirely to chance simply because workers have experience.
Experience is valuable, but experience works best when guided by proper drawings, engineering principles and professional supervision.
Bonus: Don't Ignore the Cost of External Works
Another mistake property owners frequently make is budgeting only for the main building.
You may eventually need:
- Perimeter fencing
- Gate
- Borehole
- Water storage
- Septic tank
- Soakaway
- Drainage
- Paving
- Landscaping
- External lighting
- Security house
- External electrical works
These items can represent a significant portion of the total development cost.
A complete project budget should therefore consider both the building and the surrounding infrastructure.
What Is the Best Way to Start a Building Project?
A successful construction project should follow a logical process.
1. Get your land documentation in order.
2. Carry out the necessary site survey and assessment.
3. Develop a suitable architectural design.
4. Prepare the structural design and other necessary technical drawings.
5. Develop a realistic cost estimate or BOQ.
6. Establish your construction budget.
7. Select competent professionals and contractors.
8. Agree on the scope, specifications and project arrangements.
9. Commence construction according to the approved plans.
10. Monitor and supervise the project through completion.
This approach may require more planning at the beginning, but it can significantly reduce costly mistakes later.
The Cheapest Way to Build Is Not Always to Spend Less
This may sound surprising, but one of the best ways to control construction cost is proper planning.
A poorly planned project can waste money through:
- Rework
- Material wastage
- Design changes
- Delays
- Poor workmanship
- Incorrect quantities
- Unnecessary purchases
- Structural corrections
Professional planning does not necessarily make construction more expensive.
In many cases, it helps you spend your money more intelligently.
Build With a Plan, Not With Guesswork
Your building project deserves more than trial and error.
Before you buy your first load of sand or start digging your foundation, make sure you understand what you are building, what the project requires and what it is realistically going to cost.
At NextGen Structures & Multipurpose Services Ltd., we help property owners move from an idea to a properly planned and professionally executed project.
Our services include:
- Architectural Design
- Structural Design
- Building Construction
- Quantity and Cost Estimation
- Land Surveying
- Project Supervision
- Property Development
- Road Construction
- Renovation and Remodeling
- Engineering and Construction Consultancy
Whether you already own land or you are still planning your project, getting professional guidance early can make a significant difference.
Planning to Build?
Don't wait until construction problems begin before seeking professional help.
Talk to NextGen Structures & Multipurpose Services Ltd. about your project and let us help you plan the right way—from the initial concept and drawings to costing, construction and completion.
Your building is a major investment. Build it with the right plan, the right professionals and the right standards.
NextGen Structures & Multipurpose Services Ltd.
Professional Planning. Quality Construction. Lasting Structures.