We're Foxtail Oak, an oak frame design-and-build firm with a workshop near Abergavenny in Monmouthshire, and we build garages within 90 minutes of it.
We should say plainly what this article is not. We build oak frames; we don't value houses. There is no valuation study behind anything below, and nobody should quote you one. What follows is what we've seen move the question in practice, and a way of deciding whether the building is worth it to you.
What does a garage do to the price of a house?
It depends on what the road already has. A surveyor valuing a house looks for similar properties nearby that have sold recently. Your garage moves the house into a better set of comparisons, or makes it the best example in its existing set. If every house on your road already has a double garage, adding one brings you level rather than ahead. If you're the only larger house on the road without covered parking, the gap you're closing is bigger.
The uncomfortable version: a garage adds most where its absence was a defect. That is true whoever builds it and whatever it's made of.
What makes a garage help a sale rather than hurt one?
Four things make the difference, and most of them are within your control.
Consent. A building without the right permissions is not an asset; it is a problem that surfaces when you sell. If your garage is permitted development, a certificate of lawfulness puts that in writing before you build. If it needed permission, get permission. Either costs far less than the building, and it is the one document a buyer's solicitor will ask for.
Proportion. A garage that is obviously too big or too small for the house it stands beside reads as a mistake, and mistakes don't add value. A three-bay garage in front of a two-bedroom cottage is not three bays' worth of value.
Build quality that survives inspection. A surveyor will look at the foundations, the roof and how the structure meets the ground. On an oak frame that means posts kept clear of the ground on staddle stones, stainless fixings where metal meets oak, and a roof and gutters that have been kept up.
Whether it's usable. A garage too narrow to open a car door inside gets used for bicycles, and a buyer reads it as storage rather than parking.
Where does oak differ from a blockwork garage?
Oak differs in two ways, one commercial and one not.
The commercial one is longevity, and it is worth being precise about. The oak frame is the long-lived part. Kept off the ground and detailed so that water runs off it, oak heartwood is a durable timber, and we leave our frames untreated by choice: the oak silvers and carries on. The rest of the building is not oak. The cladding, the roof covering, the doors, the gutters and any finish age at their own rate and need looking after, as they would on any garage. At the point of sale, an oak frame in good condition, with the rest of the building kept up, reads as a permanent structure.
The other is harder to put a number on. An oak framed cart shed beside a stone farmhouse near Usk looks as though it belongs there, and a blockwork one with a tiled roof does not. That isn't a line on a valuation. It is what a buyer sees walking up the drive, and we can't tell you what it's worth to them.
The counterpoint: oak costs more than a blockwork garage with a tiled roof, and it does not add proportionally more to the valuation. We don't know in detail what the same building costs in brick and block, so if you're weighing the two, get a competing quote. If your only motive is what the house sells for, oak is not the efficient way to get a garage. If you're going to look at it every day for twenty years, that calculation changes, and only you can make it.
Does a room over change the answer?
Yes, in both directions. A single-storey garage adds a useful outbuilding. A garage with a habitable room above adds floor area, and floor area is what valuations are most directly built on.
It is also priced per job rather than per square metre, because a garage with a room over is closer to a small house than a garage. At that point you're building a floor structure, a stair, insulation and a space that has to satisfy building regulations as somewhere to live. At Crickhowell that meant a workshop of about 75 m² below and an annexe of just over 50 m² above, reached by an external oak stair. The rates and the recorded costs are in How much does an oak frame garage cost?.
Whether that's worth it depends on what the room is. A home office or studio is generally additive. Anything that could be described as separate living accommodation, a bedroom with a kitchen and a bathroom, changes the planning position, may need its own consent, and can complicate a sale rather than help it. Settle the room-over question early, because it changes the foundations, the frame and the consent route, and it is expensive to change your mind about later.
When will a garage not add value?
- When it eats the garden. On a small plot, covered parking bought at the cost of usable outside space is often a net loss.
- When the house is already at its ceiling. Every road has a price ceiling, and spending beyond it does not lift the house above it. A local estate agent will tell you the ceiling on your road for nothing, and you should ask before you commit.
- When it is built without consent. Worth saying twice.
Is it worth it to you?
Resale is the least reliable reason to build a garage and the one people lead with. Go through this first.
- What will you actually keep in it? Cars, a workshop, bikes and a mower, a gym. If the answer is "storage nobody will look at", a softwood-framed or steel building is the cheaper way to get it, and we'd say so.
- Will you see it every day? From the kitchen window, from the drive, from the road. Oak is worth the difference when the building is looked at, and not when it isn't.
- Does it fit the house? Size, materials, position. Beside an old stone house, an oak frame with slate belongs. Beside a modern estate house, ask whether it does.
- Can you get consent, and will you? If the answer is "we probably don't need it", get the certificate anyway.
- Can you afford the finished building, not the frame? The frame is a fraction of the job. Base, roof covering, doors and services are the rest, and How much does an oak frame garage cost? shows what each level of scope includes. If you're comparing quotes for it, Why do oak frame garage quotations differ so much? shows what to check line by line.
- Will you keep the rest of it up? The frame asks almost nothing of you. The doors, gutters, roof and any finish do.
- Is the room over a room you need, or a number you hope for? If you can't name who will use it and for what, build the single-storey garage.
If you get to the end of that list and the garage is still a building you want, build it because you want it, and treat any effect on the house price as a bonus rather than a business case. That's the position we take with everyone who asks.
FOXTAIL OAK If you want to talk it through, we'll visit, look at the site and the house, and tell you plainly whether we think the building is right for the plot. We'll say so if we think it isn't. The design visit and the first quote are free, and the garage page has what each way of buying includes: Oak frame garages, car ports and outbuildings.
Frequently asked questions
Is there a percentage a garage adds to a house? Not one anybody should quote you. Valuation is local, and what a garage does to a house in Crickhowell is not what it does to one in a Cardiff suburb. We have no valuation source and we won't invent one.
Does an oak garage need less maintenance than a softwood one? The oak frame itself, kept off the ground and left to silver, needs no routine treatment. Everything else on the building, the cladding, roof, doors and gutters, ages at its own rate whatever the frame is made of.
Should I build the room over for resale? Only if you need the room. It is priced per job, because it is closer to a small house than a garage. It brings a planning application and full building regulations, and accommodation that reads as a separate dwelling can complicate a sale rather than help it.
Who can tell me what my house would be worth with a garage? A local estate agent or a surveyor, not an oak framer. Ask before you commit; the agent will usually tell you the ceiling on your road for nothing.
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