Cost Guide
Attic Conversion with En-suite Cost
How much adding an en-suite to your attic conversion costs, and what the plumbing and ventilation really add.
An Add-on, Not A Base Price
An en-suite sits on top of the base conversion
An en-suite is not a conversion type of its own; it is an add-on cost that sits on top of your base attic conversion. That extra is driven by getting drainage away, bringing a water supply up, the mechanical ventilation a shower room in the roof needs, and the waterproofing that keeps the room and the floor below it safe over time. We give you the add-on as a separate figure so you can see exactly what the en-suite is costing you, rather than burying it in a “from only” headline.
- ✓ The en-suite shown as a separate add-on line
- ✓ Drainage, water, ventilation and waterproofing all costed
- ✓ An honest range, confirmed at a free site survey
For the base conversion figures and what a full project includes, read the full cost guide.
The Two Figures
Base conversion plus the en-suite add-on
Indicative range only, not a quote. The figure above is the base conversion; the en-suite add-on is €[CONFIRM range] on top, depending on drainage routing, ventilation and finish. Final cost depends on size, finish, roof type and access. Figures to be confirmed with the client before launch.
Think of it as two numbers: the base habitable-room conversion, then the en-suite add-on on top. Start with the calculator for a ballpark, then book a free assessment so we can measure up and give you the honest number for your home.
The Line Items
What moves the en-suite cost
The en-suite add-on is the sum of a handful of real, separate pieces of work. When you understand the parts, you can see why one attic takes an en-suite easily and another needs more work to make it happen.
- ✓Soil pipe routingGetting waste drainage away from the attic and tied into the existing stack. How far the run is and how easily it connects is often the single biggest variable.
- ✓Ventilation (Part F)Mechanical extract to meet Part F, since a shower room in the roof rarely has enough natural ventilation on its own.
- ✓Tanking and waterproofingWaterproofing the wet areas so moisture does not reach the structure or the room below over time.
- ✓Fittings and finishThe shower, sanitaryware, tiling and joinery. Standard versus high-end choices move this figure the most.
- ✓Head height for the showerThe shower needs standing height under the slope, which can dictate where the en-suite sits and, in tight roofs, whether more structural work is needed to make it usable.
Can Your Attic Take One
Can every attic take an en-suite?
Not every one, and it comes down mainly to drainage and head height. The waste has to reach the existing soil stack on a workable route, and the shower needs standing height under the slope. Both are things we check on site, so we assess your specific roof before we say yes. Where an en-suite is not practical, we will tell you plainly rather than promise a room that will not work.
For the room itself, see our attic conversions with en-suite page, or read up on attic bedroom conversions.
En-suite Cost FAQs
Common questions, answered straight
As a guide, the en-suite add-on is €[CONFIRM range] on top of the base conversion, but it genuinely depends on your roof. The drainage route, whether mechanical ventilation is straightforward, the waterproofing needed and the finish level all move the figure. We give you the add-on as a separate line so you can see exactly what the en-suite is costing you, rather than burying it in the headline price.
Not every one, and it comes down mainly to drainage and head height. The waste has to reach the existing soil stack on a workable route, and the shower needs standing height under the slope. Both are things we check on site, so we assess your specific roof before we say yes. Where an en-suite is not practical, we will tell you plainly rather than promise a room that will not work.
Yes. The plumbing, drainage, ventilation and electrics in an en-suite all fall under building regulations, and the work is certified on completion as part of the conversion. That sign-off is what lets the room stand up at resale, and it is built into how we work rather than bolted on at the end.
Keep Reading
Related guides
Ready When You Are
Get an honest price for your en-suite attic
Book a free, no-obligation assessment. We will measure up, check the drainage and head height, and give you a clear breakdown of the base conversion and the en-suite add-on. Get in touch.
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