Before You Agree to Anything — How to Find a Trustworthy Builder or Designer in Glasgow
15 questions that protect your home, your budget, and your sanity.
When I was growing up in Lenzie, my father decided to install solar panels on our family home. He got three quotes. One for £21,000. One for £17,000. And one for £6,500.
Solar panels were relatively new at that time, and there were not many manufacturers. I remember sitting there as a child, genuinely puzzled. How could there be such a dramatic difference in price for what appeared to be the same thing?
My father went with the £6,500 quote. Over 25 years later, those solar panels still work perfectly.
But that experience never left me. It made me ask a question that became the foundation of everything I have built at Interior Space Design:
Three quotes for the same job — three very different prices. The question is not which is cheapest. It is what you are actually getting for your money.
What am I actually getting for my money?
That question is the most important one any homeowner can ask before hiring a builder or designer. And after 37 years in both the building and interior design industry, I want to give you the tools to answer it properly.
The Two Biggest Problems Homeowners Face
Before we get to the questions, it is worth understanding the two most common situations that bring homeowners to us after a bad experience with another company.
The first is the vanishing builder. They give you a start date, arrive with a large team, work intensively for a week while you feel confident and excited — and then disappear to start another job. By this point, you have committed to the project and paid a significant sum. Getting them back becomes a battle that can drag on for months.
The second is the endless extras. The builder arrives, the work begins, and then the messages start. “We didn’t include that.” “This wasn’t in the original scope.” “That will be an additional cost.” What started as a clear budget becomes a moving target, and the homeowner has no power to push back because the work is already underway.
Both of these situations are largely avoidable — if you ask the right questions before you commit to anything.
15 Questions to Ask Before Hiring Any Builder or Designer
1. What is your confirmed start date?
A professional company that has done similar projects repeatedly will know exactly when they can start and commit to it in writing. Vague answers here are a warning sign.
2. How long will the project take?
Get a confirmed timescale for the work, not an estimate. A builder who has carried out the same type of project many times will know how long it takes. Push for a specific date and get it in writing. If you are having a new kitchen installed, you need to know how long you will be without one — because ordering takeaway for weeks will take its toll on your wallet and your health.
3. Will you be on site every day?
This is a critical question. Some builders spread themselves across multiple jobs simultaneously. You deserve to know upfront whether you will have a full team on site daily or whether your project will be fitted around others.
4. Do you have any holidays planned during the project?
You do not want your builder disappearing for a month, leaving you with no kitchen, no bathroom, and a half-finished building site. Ask the question directly and get the answer in writing.
5. What deposit do you require upfront?
The size of the deposit tells you a great deal about how the company operates. A large upfront deposit before work begins is a significant risk. A professional company with strong supplier relationships and solid cash flow should not need a large sum before they have lifted a single tool. This will also tell you whether you are working with one company or a cooperative of sole traders.
6. Are you VAT registered?
If a company is VAT registered, expect to add 20% to any price they quote unless the quote explicitly states that VAT is included. Interior Space Design is not VAT registered, which means our prices are typically 20% more competitive than comparable VAT-registered firms.
7. Are you fully insured?
Ask to see their current Public Liability Insurance documents. Any reputable company will provide these without hesitation. If they cannot or will not — walk away.
8. Are your electricians and gas engineers properly certified?
Electricians must be NIC or SELECT registered — a certificate that must be renewed every year. Central heating engineers must be currently Gas Safe registered — again, an annual certificate. Ask to see these certificates. Current ones. Not last year’s.
9. Have you allowed for a contingency?
Always set aside a minimum of 5% of your total budget for unforeseen circumstances. Nobody can see through walls or under floors. Older Glasgow properties in particular can reveal dry rot, rising damp, lead pipe replacement requirements, woodworm, or condensation issues once work begins.
10. Do you provide a fully transparent breakdown of costs?
You should know exactly what you are getting for every pound you spend. An honest company will provide a complete, itemised breakdown of all costs before any work begins. Transparent pricing is not just good practice. It is a mark of a company that has nothing to hide.
11. What stage does the builder finish at?
Does their service include supply and fit of your kitchen or bathroom? Will they help you choose tiles, paint colours, and fittings? Or do they build the structure, hand you the keys, and leave you to make every remaining decision yourself under pressure and without guidance?
12. Do you have a dedicated project manager or single point of contact?
One point of contact who manages the entire project from start to finish is worth more than almost any other feature of a design and build service. Without one, that role falls to you — and unless you work in construction, it is a full-time job you did not plan for.
13. Who is responsible if something goes wrong?
A reputable company will tell you clearly who to contact if you are unhappy or if something has not arrived or has not been completed to the standard agreed. Make sure you have their contact details, and they will answer your calls.
14. Who is responsible for ordering materials?
You or the builder? A professional project manager will handle all ordering and scheduling — ensuring materials arrive when the relevant tradesperson is ready for them, not three weeks early, sitting in your garage getting damaged.
15. How much will you actually have to be involved?
Are you comfortable managing a building project yourself if you work full time or have children? A professional design and build company should proactively suggest ways to minimise the upheaval to your life. Can they set up a temporary kitchen while your new one is being fitted? Will they leave the toilet accessible for as long as possible before switching it over? These are the details that separate a company that genuinely cares about your family from one that is simply building a structure.
Every trade on site together, seeing the job with their own eyes before pricing it. No assumptions. No surprises. No "we didn't include for that.
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A home improvement, whether it is a full renovation, an extension, or a new kitchen, will change your daily routine. The right team makes it manageable. The wrong team makes it a nightmare.”
The Caring Contractors
Interior Space Design is one of the very few female-owned and female-run design-and-build companies in the UK. I am a fully qualified joiner and interior designer with 37 years of experience in the building and interior design industry.
My partner Ross and I removed the entire back wall of our home while caring for a newborn baby. We have both lived through a full house renovation — three times. We know exactly what it feels like to live on a building site. We know the stress, the dust, the disruption, and the moments when you wonder what on earth you were thinking.
That is precisely why we know how to help you through yours.
I genuinely care about my clients and their homes. Not as a marketing statement — as a lived reality. Every decision I make on a project is made with that family’s life in mind. How they cook. How they gather. How they rest. What will make their home feel like theirs?
“Any builder can build. Not every builder cares. At Interior Space Design, caring is not optional — it is everything.
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This is what it looks like when a home is designed by people who genuinely care. A real life client who loved the process as much as the result.
What This Means in Practice
Every question on this list shaped the way Interior Space Design works.
Transparent pricing, because of a solar panel quote my father received when I was a child.
One point of contact, because I have seen what happens when homeowners are left to coordinate multiple trades themselves.
Full certification for every electrician and gas engineer, without exception.
A contingency discussion in every first conversation, because surprises are not surprises when you plan for them.
We build extensions and carry out as much work as possible outside your home first — minimising the time we are disrupting your living space. We leave the toilet accessible until the last possible moment. We set up temporary kitchens. We manage every delivery and schedule the trades at the right time in the correct order. We answer every question.
We do not quote low to win work and add many variations later. We do not disappear between jobs. We do not leave you with a shell and a list of decisions you are not qualified to make.
The Cheapest Quote Is Rarely the Best Value
My father’s solar panels cost £6,500. The most expensive quote was £21,000. The panels still work 25 years later — so in that case, the cheapest option turned out to be excellent value.
But the question he asked — what am I actually getting for my money — is the right question regardless of the price. Three builders quoting very different figures for the same job are not quoting the same job. They are quoting different scopes, different materials, different levels of management, and different assumptions about what is and is not included.
Your job as a homeowner is to find out what is inside each quote before you decide. Not after.
“So how do you find a trustworthy builder? Just keep asking questions, and you will find the truth.”
Cut the cowboys, not the corners.
Ready to Ask the Right Questions?
If you are planning a renovation, extension, kitchen, or bathroom transformation in Bearsden, Milngavie, Jordanhill, Lenzie, Milton-of-Campsie, Bishopbriggs, Hyndland, or the West End of Glasgow — start with a conversation.
Every project at Interior Space Design begins with a complimentary discovery call. We will answer every one of these questions clearly, before you commit to anything.
