A cleaning company should be able to tell you when not to hire one. Here is our honest version: where DIY genuinely works, where it is false economy, and the three specific jobs that go wrong when careful people do their own construction clean.
When DIY is genuinely fine
A small renovation, one or two rooms, no new glazing, no deadline. A careful weekend with a good vacuum, microfibre cloths and patience will get you there. Same for a garage conversion or a repainted room: the dust load is small and nothing on the site punishes mistakes. Do it yourself and spend the money on the house.
When it is false economy
A full new build or a whole home renovation. The dust load is measured in kilograms, it is in every track, channel and cavity, and it resettles for days after each pass. What a crew of four does in two days takes a couple most of a week, and the finish still tells.
Anything going to handover or settlement. A buyer, valuer or building inspector walks in with fresh eyes and raking light. A clean that looks fine to someone who has stared at the site for months reads as unfinished to someone seeing it once.
Anything with a lot of new glass. This one is not about effort. It is about risk, which brings us to what actually goes wrong.
The three jobs that go wrong for DIYers
1. Glass. Construction glass carries render splash, plaster dust and grit. Wipe it with a rag and you drag that grit across the pane like fine sandpaper. The scratches do not show until the afternoon sun crosses the glass, and by then they are permanent. The professional method is blades at the correct angle, constant rinsing, and pure water finishing. One scratched pane can cost more to replace than a professional clean costs to book.
2. Silicone. Fresh caulking cures for days. Scrub a bathroom before the bead has cured and you will lift, smear or gouge joints that a caulker then has to cut out and redo. Professionals sequence the clean around the caulk, which is why we run both trades under one program.
3. Dust that keeps coming back. Fine plaster and silica dust stays airborne and settles for days. The professional approach is top down, room by room, in stages, letting rooms settle between passes, with HEPA filtration doing the collecting. The DIY approach of one heroic pass looks finished at 6pm and dusty again by morning, and the third time it comes back most people give up and call someone.
Respirable silica dust is also a health issue, not just a cosmetic one. If you do go DIY on a dusty site, wear a properly rated mask, not a paper one.
The honest decision rule
If the site is small, glass free and deadline free: DIY, genuinely. If the site is going in front of a buyer, an inspector or a settlement date, or if it has more than a few panes of new glass: the professional clean is usually cheaper than it looks, because it is priced against redoing the work, replacing a pane, or slipping a handover date.
If you do go DIY, work from the same room by room checklist our crews use so nothing gets missed. If your site is the second kind, our builders clean service covers all three stages: send plans or a short video walkthrough and we will return an itemised quote inside 24 hours, with a supervisor sign off and a comeback at no cost if anything is missed. That guarantee is the actual product. A DIY clean does not come with one.
The Builders Clean team