Bricks for loft conversion

[xyz123]

Hi, we have started loft conversion and builder is asking me to choose from couple of brick samples he's left. On the face of it both appear Sam except one is hollow with holes in middle while other doesn't have any holes. I wasn't expecting to be offered a choice between two types so little confused now. Any pointers please?

Thanks

[RotorRambler]

1. Solid Bricks (no holes)
• Heavier and denser — usually stronger structurally.
• Better sound insulation and slightly better thermal mass.
• Often used where bricks are visible (like outer walls or where appearance matters).
• Typically more expensive due to more material and weight.

2. Perforated/Hollow Bricks (with holes)
• Lighter, easier to handle and transport.
• Faster to lay, especially on internal or non-loadbearing walls.
• Cheaper than solid bricks.
• Good keying for mortar — the holes help mortar bond well.
• May be less suitable for exposed areas where high strength or full weatherproofing is required.


• Where will the bricks be used? (Exterior, interior, structural?)
• Are the bricks going to be visible? If so, check how each looks once mortared in place.
• Is strength or insulation a factor in that part of the build?
• Is there any planning requirement or match to existing bricks?

If the builder is okay with either, the hollow option might be more efficient and cost-effective, unless it’s for a visible facade or structural support where solid bricks are preferred.

[Little Lofty]

I’d imagine you are choosing the best match for the house, the fact they are different in design is probably irrelevant.

[wolfracesonic]

I’m guessing it’s a hip to gable conversion so whatever matches best as LL said, holes vs solid not really an issue for you as a homeowner and I wouldn’t say the cost difference is a factor for the number involved. Given your unlikely to get a perfect match, a dentil or string course separating the new from old in a contrasting brick can often look good.