How To Read And Compare Quotes For Extensions And Conversions

Making Sense Of Builder Quotes

When you receive quotes for your extension or conversion project, comparing them can feel confusing. Prices vary widely, some quotes are pages long while others are a single paragraph, and it is hard to know if you are comparing like with like.

This guide helps you understand what quotes should contain, how to spot gaps and assumptions, and how to make a fair comparison between different builders in Central Scotland.

Types Of Quotes

The One-Line Quote

Some builders provide brief quotes: "Rear extension as discussed: £45,000 + VAT". While simple, these leave enormous room for misunderstanding. What exactly is included? What happens if there are problems? What specification are they assuming?

One-line quotes are risky. They may seem competitive until you discover that half of what you expected is "extra". Avoid accepting quotes without detailed breakdown.

The Itemised Quote

Good quotes break down the cost into sections, showing what each part of the work costs. This might include foundations, walls, roof, windows, electrics, plumbing, and finishes as separate items.

Itemised quotes help you see where money is being spent and make it easier to adjust scope if budget is tight. They also reduce disputes because both parties know what is included.

The Specification-Based Quote

The best quotes reference a detailed specification document that describes exactly what will be built, what materials will be used, and what quality standards apply. This is standard practice on larger projects and worth requesting for any significant work.

What A Good Quote Should Include

Understanding Provisional Sums And Allowances

Quotes often include provisional sums (PS) or allowances for items that cannot be priced exactly at quote stage. Common examples include:

• Kitchen allowance: A sum set aside for kitchen units and appliances
• Sanitary ware allowance: Budget for bathroom fittings
• Tile allowance: Budget for floor and wall tiles
• Contingency: Budget for unexpected items

These allowances should be realistic. A £3,000 kitchen allowance will buy basic units; £8,000 is more realistic for mid-range quality. Check what the builder assumes these sums will cover.

Spotting What Is Missing

Cheaper quotes often exclude items that more expensive quotes include. Common exclusions to watch for:

Ask each builder to clarify exclusions, then add the cost of excluded items to compare total project cost, not just the headline figure.

Creating A Comparison Checklist

To compare quotes fairly, create a checklist covering all aspects of the work. Mark whether each builder includes or excludes each item:

Pre-Construction

• Building warrant application
• Structural engineer
• Site survey if needed

During Construction

• Scaffolding
• Skip hire and waste disposal
• Temporary protection of existing areas
• Site welfare facilities

Building Work

• Foundations
• Drainage and connections
• Walls and roof
• Steelwork
• Insulation
• Windows and doors (specify exactly which)

Services

• Electrical installation (how many sockets and lights?)
• Plumbing
• Heating (radiators or underfloor?)
• Ventilation

Finishes

• Plastering
• Decoration (how many coats? Whose paint?)
• Flooring (supply and fit? What type?)
• Tiling (supply and fit? How much?)

Fit-Out

• Kitchen (supply? Fit? Appliances?)
• Bathroom (supply? Fit?)
• Built-in storage

External

• Patio or path reinstatement
• Fencing
• Landscaping

Questions To Ask Each Builder

When reviewing quotes, ask these questions:

• What is included in the price and what is excluded?
• What provisional sums or allowances are included, and what will they buy?
• Is this a fixed price or an estimate?
• What could cause the price to change?
• When can you start and how long will the work take?
• What is your payment schedule?
• Who will be on site day-to-day?
• How do you handle variations and changes?
• What insurance and warranties do you provide?
• Can you provide references from similar recent projects?

Fixed Price Vs Estimates

There is an important difference between a fixed price and an estimate:

Fixed Price

A fixed price quote commits the builder to completing the specified work for the stated sum, regardless of whether their actual costs turn out higher. This gives you certainty but the builder may include a margin for risk.

Estimate

An estimate is the builder's best guess at what the work will cost. The final price may be higher or lower. This may seem attractive if the estimate is low, but you carry the risk of cost increases.

For most homeowners, a fixed price contract with clear variation procedures offers the best balance of certainty and flexibility.

Payment Schedules

How and when you pay matters. A typical payment schedule might be:

Be wary of builders requesting large upfront payments (more than 15%) or front-loaded schedules where you pay more than the value of completed work.

Warning Signs

Be cautious if:

• The quote is significantly cheaper than others without clear reason
• The builder is unwilling to provide a detailed breakdown
• They want large deposits before starting
• They cannot provide references or examples of similar work
• They pressure you to decide quickly
• They are not willing to put agreements in writing
• They have no fixed business address or are difficult to contact

Frequently Asked Questions

Getting Started

The key to good quotes is providing clear information to builders. Complete drawings, a written specification, and a clear brief all help builders price accurately. Working with experienced local contractors who understand Central Scotland conditions leads to better outcomes.