GSM Builders Ltd

GSM Builders Ltd 🛠️ 🏠 Specialising in Construction, Renovations, and Extensions. New builds and more 🇬🇧

This room looks like a decorating job. Almost none of it was.The shelves either side of the chimney breast are lit, whic...
09/10/2026

This room looks like a decorating job. Almost none of it was.

The shelves either side of the chimney breast are lit, which means that wiring was run before the plasterboard went on. The television position decided where the conduit went. The panelling decided where the sockets sit, because a socket landing in the middle of a panel looks like a mistake forever. There is timber fixed inside the wall anywhere something heavy hangs.

None of that can be added afterwards without opening up a finished wall.

Jobs rarely go wrong because something is badly built. They go wrong because decisions arrive too late. By the time the plasterer turns up, your socket positions, your lighting circuits, your radiator positions and anything that needs fixing into a stud are already settled, whether you thought about them or not.

So the most valuable hour of any renovation is the one you spend walking the empty rooms with your builder before first fix, saying out loud where the bed goes, where the telly goes, and which side of the bed you read on.

This was a full flat renovation in Chelsea. The whole project is written up here:
https://gsmbltd.com/complete-flat-renovation-chelsea-case-study/?utm_source=meta&utm_medium=social&utm_campaign=first-fix

Planning something similar in West London? Send us a message and we will walk it with you.

Look at where the storage is in this loft conversion of ours.Almost all of it sits in the parts of the room you cannot s...
08/10/2026

Look at where the storage is in this loft conversion of ours.

Almost all of it sits in the parts of the room you cannot stand up in. The eaves either side, the slope behind the bed, the awkward triangle by the window. That is deliberate.

Usable floor area in a loft is normally measured where there is at least 1.5 metres of head height, and a loft has a lot of floor that falls below that. Leave those strips empty and they become dead space with furniture shoved against them. Plan them as fitted storage before first fix and you get a bedroom that needs no freestanding wardrobe at all. That is usually the difference between a loft that feels like a proper room and one that feels like an attic with a bed in it.

Two things worth knowing if you are planning one. Fitted storage in the eaves has to be designed before the plasterboard goes on, because the joiner needs to see the structure. And always leave one eaves panel removable, because that is where pipework and future access lives.

More on how the different loft types change the usable space you end up with:
https://gsmbltd.com/types-of-loft-conversion-compared/?utm_source=meta&utm_medium=social&utm_campaign=loft-storage

Thinking about your loft? Send us a message and we will tell you honestly what your roof can give you.

If you ring a painter this week and they offer to start on your exterior next Monday, be careful.Masonry paint needs the...
06/10/2026

If you ring a painter this week and they offer to start on your exterior next Monday, be careful.

Masonry paint needs the wall somewhere between about 5 and 25 degrees, and it needs to stay dry for a day after it goes on. In London that gives a reliable window of April to early July, and a shorter second one in September. Paint put on outside those windows can look perfect on the day and fail within two years.

So the honest answer in October is usually this. We will quote you now and book you for spring. Anyone saying yes to a full exterior in November is either working on sheltered elevations only or is not telling you the whole story.

Two things that catch people out even in summer. North facing walls dry slowest and grow algae back first, so they want the warmest weeks you can give them. South facing walls in full sun dry faster than you can spread the paint, which leaves roller marks, so those get done in morning shade.

New guide out today with 2026 prices for Hillingdon, Ealing, Hounslow and Uxbridge, what each part of the job actually costs, and the five things that move the budget most:
https://gsmbltd.com/exterior-house-painting-cost-west-london/?utm_source=meta&utm_medium=social&utm_campaign=exterior-painting-cost

Planning yours for spring? Send us a message and we will come and look now, so you are first in the diary.

Most people assume a 6 metre kitchen extension costs twice what a 3 metre one does.It does not, and the reason is simple...
06/10/2026

Most people assume a 6 metre kitchen extension costs twice what a 3 metre one does.

It does not, and the reason is simple. Foundations, drainage and the steel are largely fixed costs. You pay them whether the room is 3 metres deep or 6. Going deeper roughly doubles the floor area for about 50 to 60 percent more money.

The catch is planning, not price. Up to 3 metres is permitted development on most semis around Hayes, Ruislip and Greenford. Going to 4 or 6 metres needs prior approval, which means a 42 day neighbour consultation. That is time to allow for, not a refusal. On the 1930s semis near us we now build more 4 and 5 metre extensions than 3 metre ones.

For a sense of scale, a 20 m2 rear kitchen extension in West London runs £50,000 to £70,000 for the build, with the kitchen itself on top of that.

Full 2026 breakdown, what each element actually costs and the five decisions that move the budget most:
https://gsmbltd.com/kitchen-extension-cost-west-london/?utm_source=meta&utm_medium=social&utm_campaign=kitchen-extension-cost

Thinking about one? Send us a message and we will tell you honestly what your house can take.

If you live in a 1930s semi, the loft conversion you probably need is not the one you have been reading about.Those hous...
05/10/2026

If you live in a 1930s semi, the loft conversion you probably need is not the one you have been reading about.

Those houses almost all have a hipped roof, where the end slopes inwards instead of rising to a flat gable wall. That slope is exactly where your head height goes. Put a standard dormer on the back and you still end up with a room you can only stand up in down the middle.

A hip to gable fixes the cause. The sloping end is rebuilt as a vertical wall, which squares off the roof and gives you full height across the width. It is usually paired with a rear dormer, and together they turn an unusable loft into a proper double bedroom with an en suite.

It is the most common conversion we do on the semis around Hayes, Ruislip, Greenford and Harrow, and it is worth knowing the difference before you get quotes, because a quote for a dormer alone on a hipped roof is answering a different question.

https://gsmbltd.com/hip-to-gable-loft-conversion/?utm_source=meta&utm_medium=social&utm_campaign=hip-to-gable

GSM Builders Ltd, Hayes. Extensions, lofts and refurbishments across West London.
Call 020 8077 2121

The cheapest room you will ever add to your house is almost certainly the one already attached to it.Most garages in Wes...
04/10/2026

The cheapest room you will ever add to your house is almost certainly the one already attached to it.

Most garages in West London are not storing a car. They are storing a freezer, a bike and twenty years of things nobody wants to throw away. The walls, roof and foundations are already there, which is why converting one costs a fraction of building new.

The building control charge is lower too. In Hillingdon a detached garage conversion under 40 square metres carries a 818 pound fee, against 1,122 for an extension. Those are the council's own 2026/27 figures.

Three things decide whether it works: the floor usually has to come up for insulation and damp proofing, the up and over door opening needs a proper structural solution rather than just bricking it in, and you need somewhere else for the boiler and the meters if they live in there.

Done properly it becomes a bedroom, an office or an annexe. Done cheaply it becomes a cold room nobody uses in January.

https://gsmbltd.com/garage-conversion-cost/?utm_source=meta&utm_medium=social&utm_campaign=garage-conversion

GSM Builders Ltd, Hayes. Extensions, lofts and refurbishments across West London.
Call 020 8077 2121

Already converted your loft? You may have spent the allowance without knowing it.Here is the rule almost nobody explains...
03/10/2026

Already converted your loft? You may have spent the allowance without knowing it.

Here is the rule almost nobody explains. Permitted development gives you a fixed amount of added roof volume: 40 cubic metres on a terraced house, 50 on a semi or detached. That is the allowance for the whole roof, not per project.

So if a previous conversion already took part of it, you only have what is left. On a terrace that has had even a modest dormer, there may be almost nothing, and adding one now needs full planning permission rather than permitted development.

Worth knowing before you plan, because it changes the timeline more than the budget.

The other rules that catch people: a dormer cannot sit higher than the existing ridge, it has to be set back at least 0.2 metres from the eaves, and nothing can go forward of the elevation facing the road. Front dormers are never permitted development.

We have written up the four dormer types, what each costs in West London, and what to check before you commit.

https://gsmbltd.com/is-dormer-loft-conversion-is-a-good-idea/?utm_source=meta&utm_medium=social&utm_campaign=dormer-rules

GSM Builders Ltd, Hayes. Extensions, lofts and refurbishments across West London.
Call 020 8077 2121

If your house has stood empty for two years, your renovation might be taxed at 5 per cent instead of 20.Most homeowners ...
02/10/2026

If your house has stood empty for two years, your renovation might be taxed at 5 per cent instead of 20.

Most homeowners never hear this. Under HMRC's rules, a property empty for two years or more before work starts can qualify for the reduced VAT rate on the renovation. The same can apply when you change the number of dwellings, like splitting a house into flats or putting flats back into one house.

On a 120,000 pound refurbishment that is roughly 18,000 pounds. Not a discount anyone gives you. Just tax you were never required to pay.

The catch is timing. The evidence requirements are specific and it has to be raised before the quote is written, not after the invoices start arriving. Tell your builder and your accountant early.

We have put the full 2026 numbers together for West London: cost per square metre at three levels, where the money actually goes room by room, and the costs people forget, including the six months of rent nobody budgets for.

https://gsmbltd.com/house-renovation-cost-west-london/?utm_source=meta&utm_medium=social&utm_campaign=house-reno-cost

GSM Builders Ltd, Hayes. Extensions, lofts and refurbishments across West London.
Call 020 8077 2121

One question to ask before you sign a builder's quote: does this include the building control fee?It is not a small line...
02/10/2026

One question to ask before you sign a builder's quote: does this include the building control fee?

It is not a small line. In Hillingdon an extension under 40 square metres carries a 1,122 pound building control charge before a brick is laid. A loft is 1,108. A structural opening is 396. Those are the council's own 2026/27 figures, not an estimate.

A quote that quietly leaves that out is not the cheaper quote. It just looks like one until the invoice arrives.

Two more worth asking. Who submits the application, you or them? And who books each inspection? That is the job that falls between the builder and the homeowner, and it is the one nobody books.

We handle the application and the inspections as part of the work, and our quotes list the fees separately so you can see exactly what you are paying for.

https://gsmbltd.com/building-regulations-extension-west-london/?utm_source=meta&utm_medium=social&utm_campaign=quote-questions

GSM Builders Ltd, Hayes. Extensions, lofts and refurbishments across West London.
Call 020 8077 2121

Before you knock that wall through, check where the other end of the steel lands.If the beam bears into a wall you share...
30/09/2026

Before you knock that wall through, check where the other end of the steel lands.

If the beam bears into a wall you share with next door, that is work to a party structure. You have to serve notice under the Party Wall Act and your neighbour has a right to respond. In a terrace it is almost certain. In a semi, one end of the beam very often lands in the shared wall too.

Notice periods are fixed by law. No builder can shorten them, and finding out after you have booked the job is how a two week opening turns into a two month wait.

The rest of the numbers, for West London this year: a structural engineer is 250 to 700 pounds, Hillingdon charges 396 pounds for a simple structural opening, and a finished single storey knock through usually lands between 2,500 and 6,500 pounds all in.

We wrote up the whole thing, including the three mistakes that fail a building control inspection.

https://gsmbltd.com/removing-load-bearing-wall-west-london/?utm_source=meta&utm_medium=social&utm_campaign=load-bearing-wall

GSM Builders Ltd, Hayes. Extensions, lofts and refurbishments across West London.
Call 020 8077 2121

Address

13 Leven Way, Hayes
London
UB32SR

Opening Hours

Monday 8am - 6pm
Tuesday 8am - 6pm
Wednesday 8am - 6pm
Thursday 8am - 6pm
Friday 8am - 6pm

Telephone

+442080772121

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