Build your beam
An elephant standing on a spliced steel beam bridging two piers
Attic conversion beams · made in Lusk, Co. Dublin

Spliced attic beams, made in Lusk.

Steel attic beams (RSJs) made in multiple bolted pieces, so they carry up through the house and bolt together in the attic. Fabricated in Lusk, sandblasted, painted and delivered across Ireland. Choose your span below and get a live price.

✓ Cut to your exact span ✓ Sandblasted & painted ✓ Bolts included
Build your beam →
Splices strong enough to trust — M20 Grade 8.8, painted and ready to bolt up on site.

Build your beam

Live price · ex-VAT

Choose your section, length and options. The price updates as you go. Switch between ex-VAT and inc-VAT prices in the summary — delivery is added at checkout.

This calculator prices fabrication — it doesn't select or approve the structural design. Available ordering lengths, and the suggested splice count and bearings, are starting points only. Your engineer must confirm the beam section, splice arrangement, bearings and connections for your project.

Specification 203×133×25 UB
203×133×25 UB25 kg/m · lengths to 12.0 m
254×146×31 UB31 kg/m · stiffer, lengths to 12.0 m
m
4.00 m12.00 m
↗ For spans over 6.0 m we recommend stepping up to the 254×146×31 UB for a stiffer beam.
1 splice1st included in price
2 splices+€53
i Suggested for this span.
None
6 mm+€42
13 mm+€63
6 mm — for screwing timber. 13 mm — for bolting timber.
None
6 mm+€42
13 mm+€63
6 mm — for screwing timber. 13 mm — for bolting timber.
Bearing both endsrecommended
Wall plate, one end+€63
Wall plate, both ends+€126
! Only use a wall end-plate where the beam genuinely can't bear. Bearing onto the supporting wall is the stronger detail — use it wherever possible.
🏗️ Collect in Luskfree
🚚 Deliver to mefrom €100
📍 K45 KF96 — Lusk, Co. Dublin. Collection by arrangement.
Standardabout 5 working days
I need it soonertell us your date
Your beam
€578ex-VAT · before delivery
Overall beam length: 5.20 m (incl. 100 mm bearing each end)
1

Secure card payment. VAT (23%) added at checkout. Delivery is confirmed before dispatch. Payment on the day available for trade accounts.

Non-standard beam? Get a quote →

How spliced attic beams work

A full-length steel beam usually can't be carried up the stairs or through the attic hatch of an existing house. A spliced beam is cut in multiple pieces with bolted end-plates, so it goes up in pieces and is bolted together in the attic.

1 · CHOOSE

Pick your span

Choose the section and clear span. Your engineer or architect specifies the beam size for the job.

2 · WE MAKE IT

Cut, spliced, painted

Cut to length in Lusk with bolted end-plate splices, M20 Grade 8.8 bolts included, sandblasted and painted.

3 · DELIVERED

Collect or delivered

Collect free from Lusk, Co. Dublin, or get it delivered anywhere in Ireland with a quote from your address.

4 · BOLT UP

Assemble in the attic

Carry the pieces up, bolt the splices together and lift onto the bearings. Optional drilled holes for timber.

What the pieces look like

Our own beams, made in Lusk.

Pieces of spliced steel attic beams, painted red and stacked on timbers, with drilled end plates on their ends
The pieces. Each beam is made in short lengths and painted. Wherever two pieces meet, each has a steel plate welded across its end.
Close-up of steel end plates, each with six bolt holes, welded to the ends of painted beam pieces
The end plates. Each plate is drilled for the bolts that hold the joint together.
A real bolted end-plate splice joint on a painted steel beam
Bolted up. A finished splice: the two plates face to face, held with M20 Grade 8.8 bolts.

Steel beams for attic conversions in Ireland

Attic Steel supplies spliced universal beams (UBs, often called RSJs) to homeowners, builders and attic conversion companies across Dublin and the rest of Ireland.

  • Attic conversion floor beams and ridge beams
  • Lengths from 4.0 m up to 12.0 m in standard sections
  • 203×133×25 UB and 254×146×31 UB steel beams
  • Steel for dormer and hip-to-gable conversions
  • Trade and builder orders welcome
  • Custom lengths, sections and heavy loads quoted
Painted steel universal beams seen end-on, showing the I-shaped cross-section
Universal beams seen end-on: the I-shaped section often called an RSJ.

Attic beam questions

Straight answers to what people ask before ordering.

What is a spliced attic beam?How the splice works and how it goes together What does an attic beam cost?Real prices by span, extras and delivery What size beam do I need?What your engineer looks at Getting a beam into the atticPiece lengths and weights by span
What is a spliced attic beam?

A spliced attic beam is a steel beam made in multiple lengths (up to six, on the longest beams) that are joined with bolted end-plate splices. The pieces are light enough to carry up through the house and bolt together in the attic, so you can fit a full-span beam for an attic conversion without a crane. Read the full guide →

Which steel sections do you supply?

Two standard universal beam (UB) sections: 203×133×25 UB (25 kg/m, lengths 4.0 to 12.0 m) and the stiffer 254×146×31 UB (31 kg/m, lengths 4.0 to 12.0 m). Lengths outside this range or other sections can be quoted on request. Which size do I need? →

How much does an attic beam cost?

The live price on the website starts at €525 ex VAT for the 203×133×25 UB and €630 ex VAT for the 254×146×31 UB, and includes one splice, sandblasting, painting and bolts. Longer spans, extra splices, drilling and wall plates add to the price. VAT at 23% is added at checkout. See prices by span →

Do I need an engineer to specify the beam?

Yes. We supply the steel, but your engineer or architect should specify and sign off the beam size for your job. Splice design calculations are available on request for your engineer to review.

What is included in the price?

The beam cut to your span, bolted end-plate splices with M20 Grade 8.8 bolts, sandblasting and paint. Optional extras are drilled holes (6 mm for screwing timber, 13 mm for bolting timber) and wall plates.

Do you deliver, and where?

Yes, we deliver across Ireland from Lusk, Co. Dublin. Delivery is a flat €100 within about 30 minutes' drive of Lusk and €3 per km beyond that, and the website gives you a delivery quote from your address. You can also collect for free from Lusk (Eircode K45 KF96) by arrangement.

How long does it take?

Standard turnaround is about 5 working days from order. We can often do it quicker if you need it sooner: choose "I need it sooner" when you order and give us your date, or call or WhatsApp John on 083 461 3869.

Can I get a beam that isn't on the website?

Yes. For spans over 12.0 m, different sections or heavy point loads, send the details through the enquiry form or WhatsApp and we'll price it up. No card is needed for a quote.

Something non-standard?

Spans over 12.0 m, different sections, heavy point loads or anything you're not sure about — send the details and we'll price it up. We'd always recommend your own engineer signs off the design for your job. No card needed for a quote.

📐 Design calculations available for your engineer on request — ask for the splice calc →

Sends straight to us — you'll get a confirmation email.

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