Integrated garage to home office
Brent · 1950s semi · 7-week build
Brief
Two software developers in a 1950s Brent semi needed dedicated workspaces away from the family rooms. The integrated single garage was used for storage, with a sagging concrete floor and no insulation.
Challenge
PD class E precluded standalone outbuilding routes; conversion was the cleanest path. Existing concrete floor was 100mm uninsulated, well below Part L. Original side door entry was awkward against the boundary.
Solution
Saw-cut and replace existing slab with insulated raft to 150mm PIR; underfloor heating loop coupled to existing combi. Brick infill of the front opening with a matching-tone stock brick, retaining only a tall glazed pivot door and a high light. Full Part L insulation to walls and roof. Two built-in desks, cable management, dedicated 4kW air-source mini-split for cooling.
Outcome
LDC issued in 6 weeks. Site build completed in 7 weeks. Featured in homeworking magazine on completion. Resale agent valued the uplift at £85,000 against £32,000 spend.
Spec
Project specification.
Gallery
Inside the build.
Builderr vs other London builders.
The construction industry has a wide distribution of operators. Here's what changes between a directly-employed, fixed-scope outfit and the alternatives.
| Criterion | Builderr | Typical London builder | Cowboy outfit |
|---|---|---|---|
| Labour model | Directly employed team (PAYE) | Mixed subcontract gangs | Day-rate cash labour |
| Pricing | Fixed-scope itemised quote | Estimate + provisional sums | Verbal price + variations |
| Design & engineering | In-house architect + SE | Outsourced, separate billing | Builder draws on the back of an envelope |
| Planning + LDC handled | Yes — included in price | Often charged extra | Builder asks you to apply |
| Party wall surveyors | Instructed by us | Your responsibility | Skipped (illegal) |
| Building control | Plans + site inspections booked by us | Building Notice route | Not registered |
| Project management | Dedicated PM, weekly photo updates | Foreman doubles up | Owner-manager juggles 5 jobs |
| Payment schedule | Stage payments against signed-off milestones | Weekly invoices | Cash up front |
| Insurance | £10M PL + 10yr structural warranty | £2–5M PL only | No documented cover |
| Snags at handover | <3 typical | 20–30 typical | Walk-off mid-job common |
| Variation creep | 0% — fixed scope | +15–25% over original quote | +40%+ regularly |
Save £6,400–£14,400 on a garage conversion.
Industry data (FMB, RICS, Which? Trusted Trader 2024) shows the average London construction project overruns by 18–22% on cost and 25–35% on time. Fixed-scope contracts with a single accountable team eliminate that variance. The savings above assume a typical project at £32,000.
Want a build like Brent?
Get a fixed-scope quote with the same direct-labour delivery. Senior consultant call within one business hour.
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