No one starts a renovation expecting to go over budget. And yet, almost everyone does. Not because they were reckless, or didn’t plan, but because there are costs that don’t show up until the job starts, and by then it’s too late to do much about them.
Eager to understand exactly where the renovation budget comes from, I called two people who had been through it all: Sarah James, who managed the entire project; Home renovationand Katie Treadwell-Haas, who has been renovating rooms in her 1950s home for the past two years. Between them, they had six things to say that every innovator needs to hear before they start…
1. Your builder’s spec is not always your spec
There’s a version of budgeting where you get a quote, nod, and assume you’ll get exactly what you asked for. But that’s not always the case, and the difference between those two things is where your surprising amount lies renovation costs Can spiral.
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“Usually the builder will set the cheapest price they can get away with,” explains Sarah James, who has just finished renovating her family home. “Unless you specify the exact spec and type you want, that’s what you’ll get. This is something you should consider carefully before getting your quote and discuss with your builder what quality level they’re going for.”
In her case, that difference appeared first in the details—the architraves and skirting board They were functional but not quite what she had imagined. Then came the doors. The architect drew standard-width openings, the most budget-friendly option, and the builder priced accordingly. It was only when Sara started looking at doors properly that she realized that giant ones existed and that they would have suited the house better, especially downstairs. But by then, the gaps had already been bridged.
“It would honestly look better if we had wider doors,” she reflects. “You don’t know what you don’t know – that’s why it’s so important to explore every option at the planning stage, before anything is built.”
The Takeaway: Before agreeing to any quote, sit down with your builder and go over every line. Ask what brand, grade and finish they’ve priced, and use the planning stage to explore all your options, not just the ones your architect has drawn up. The cheapest option on the plans isn’t always right for your home.
2. Expect the unexpected and budget for it
While every renovator has a priority list at the start of a project, what no one tells you is how quickly an unexpected problem can derail it and leave you completely stranded.
Katie Treadwell-Haas found this out herself When unexpected drafts from the aged windows forced her to reconsider the whole Renovation Timeline. “Once we realized that the window was a problem, we had to rethink the entire work sequence,” she explains. “That was my number one priority Kitchen remodelBut Windows went straight to the top of the list.”
She got three quotes and the spread was eye-opening. The cheapest is around £3,000 less than the others but Katie will need to get relevant FENSA certificate “We ended up going with the more expensive option because I wasn’t sure the quality would be there otherwise,” she says. “If something needs to be done right, do it right.”
The Takeaway: Build a contingency into your budget that is ring-fenced for unexpected discoveries (not just upgrades). Before committing to any work order, you should also get a proper assessment of your property’s condition so that surprises are on your terms, not the builder’s.
3. Check for hidden regulatory and infrastructure costs before you start
Of all the unexpected renovation costs, the cost of a letter from the planning authority is one of the most frustrating.
“Initially, there was no discussion about the need for it Bat SurveySarah sighs. We weren’t told this by our architect, and the planning authority didn’t mention it until we were at least 12 weeks into planning.” Then there was a cascade of surveys, each one triggered by the last – because there was apparently a piece of bat poo in the loft. Surveys can only be done at certain times of the year, and waiting for a full season means closing the window.
Asbestos There’s another cost that has a habit of revealing itself at the worst possible moment, and Katie Treadwell-Haas says every renovator should consider it from the start. Samples may need to be sent away for testing, and removal may be important if asbestos is found. She discovered this for herself when she had Asbestos Survey Her purchase was carried out as part of the process.
“There are some in the house,” she says – matter-of-factly – a chrysotile tile under the stairs, left undisturbed under what she suspects is the original carpet from the 1950s. “It’s not a problem as long as you don’t disturb it, but there are times when we improvise Storage under the stairs We’ll have to get a professional to take the bag and dispose of it properly.” She also had asbestos downpipes, and the no-fine concrete construction of her home brought its own structural considerations, including the need to angle-grind the old guttering before the new PVC went in. “Which is a great way to spend more than five grand,” she laughs.
The Takeaway: Older properties in particular carry hidden compliance and structural costs that are not included in a quote unless you inspect them first. A good architect should flag these risks early. If you haven’t, ask directly. Missing the survey window can delay your entire project by up to a year.
4. Never underestimate the value of a garden
“Don’t underestimate how much extra you can spend on it the garden To make it as beautiful as your home,” says Sarah James, a garden designer herself. Consider this from the start. The cost is the same as the inside, and even when we budgeted for it, it’s still very expensive.”
Another mistake, she says, is assuming your builder is the right person for the job. “For the garden it is advisable to use a landscaper rather than your builder. This is often done at the end of the build, and the builder is in a hurry to move on to the next job and does not spend the time necessary to beautify your garden. A landscaper understands how drainage, suitable soil for flowerbeds and weather affect every aspect of the build.” When it comes to the handover between the two, Sarah is unequivocal: “Discuss where the builder ends and the landscaper begins. These are important issues – who is responsible for what – and get the prices right.”
The Takeaway: Budget for the garden at the beginning of your renovation, not as an afterthought. Use a landscaper rather than your builder for exterior work and agree in writing where one’s responsibility ends and the other begins.
5. Write a schedule of works and make it obsessively detailed
If there’s one document that separates a renovation from a not-in-the-budget document, it’s the to-do list.
“The most important thing we did to help keep us on track with the budget was to create a very comprehensive work schedule,” says Sarah. “It was broken down into several sections and subdivisions so the builder could put a price under each one. We knew we needed 15 doors, so they priced 15 doors, 15 door fittings, painting, hinges and door furniture. We gave the square meters of all the tiling and included in the electrical draw a very specific amount of how much we were willing to spend in electrical draw per meter. So they could price it exactly.”
The value of that document became apparent almost immediately. “They tried to overcharge us for electrical work, which is quite common,” says Sarah. “We were able to go back on schedule and discuss why the price had changed. It took us weeks and weeks to get it done, but it was worth every hour.”
The Takeaway: Before you agree to any quote, write down the work schedule and make it as detailed as possible. You can use this as a reference point throughout the build, and refer to it the moment any costs start to add up.
6. Know who is managing your build and what that actually means
There’s one question that almost every renovator forgets to ask until it’s too late, and it’s this: Who is Manage your builds?
“The builder will probably say they’ll manage it,” says Sarah, “but find out exactly what this means.” Do they manage every aspect of the build – all the workers coming to the property, organizing them all to come when needed? A large amount of organization is required to manage the build. You can also get a professional property manager to manage the build for you, but still be prepared for a lot of questions coming your way.
It’s worth being honest with yourself about how much time and headspace you have for those questions, because they will come regardless of who is nominally in charge. The more complex the build, the more you need someone whose sole job is to move all the moving parts.
The Takeaway: Before work begins, clearly establish who is managing the project on a day-to-day basis, what is actually involved, and whether you need a professional project manager to drive it forward.
No one tells you about renovations The costs that hurt the most are not necessarily the big structural surprises. Often it’s the small decisions that are made too early, or not made at all. From the final details K Make your renovation affordable for Survey results that raise red flagsThe best defense is always the same: ask more questions before you start.
