It's something we hear quite regularly from homeowners in Staines-upon-Thames:
"We've had three quotes and they're all completely different."
And honestly, it's one of the most common situations people find themselves in when planning a house extension.
Receiving multiple quotations for an extension is sensible, but it can become confusing when one builder is quoting £80,000, another is quoting £110,000 and another is quoting £140,000 for what appears to be the same project.
So why does it happen?
The Drawings Are Only Part of the Story
Many homeowners assume that if three builders are pricing from the same drawings, the quotations should be broadly similar.
In reality, drawings are only one part of the process.
Different contractors will make different assumptions about:
- Finishes
- Specifications
- Site conditions
- Project management
- Risk allowances
This can have a significant impact on the final figure.
What’s Actually Included?
One of the biggest reasons quotes vary is because different builders include different things.
For example:
One contractor may include:
- Decorating
- Flooring
- Building control liaison
- Waste removal
- Final cleaning
while another may exclude several of these items.
At first glance the cheaper quote looks attractive, but the overall cost may increase significantly once those items are added back in.
Quality of Materials
Material specifications can also vary considerably.
The difference between standard products and higher-quality alternatives can have a noticeable impact on the overall cost of a project.
Windows, doors, kitchens, flooring and heating systems are all areas where specifications can vary widely.
Provisional Sums and Allowances
Provisional sums are another common reason for price differences.
If a builder includes very low allowances for kitchens, bathrooms or finishes, the initial quote may appear cheaper than it realistically should be.
It's always worth understanding exactly what assumptions have been made.
Experience and Project Management
Not every builder approaches projects in the same way.
Some companies allow for:
- Dedicated project management
- More supervision
- Better communication
- Additional quality control
These things naturally come at a cost, but they can also contribute significantly to how smoothly the project runs.
Cheapest Doesn't Always Mean Best Value
It's completely understandable to look at the lowest figure first.
However, the best value quote is often the one that is the most transparent and realistic, rather than simply the cheapest.
A detailed quotation that clearly explains what's included can often save homeowners a great deal of stress later on.
Compare Like-for-Like
Whenever you're reviewing extension quotations, try to compare them on a like-for-like basis.
Look beyond the final figure and focus on:
- Scope of works
- Inclusions
- Exclusions
- Allowances
- Timescales
This will usually give a much clearer picture of the true value being offered.
Thinking About Extending Your Home?
If you're considering a house extension in Staines-upon-Thames, we're always happy to discuss your plans and provide transparent advice on costs, specifications and the factors that influence pricing.
📧 Email us here