Tier 1 Joinery for Prime Central London: What HNW Clients and Architects Should Specify

Last updated: April 2026. By the Reeve & Co studio team.

“Tier 1” is a term construction managers use to describe their top tier of trades — the contractors and sub-contractors they will allow on a Prime Central London (PCL) job that is insured, scrutinised and watched by the client every week. For bespoke joinery, the Tier 1 standard is the minimum expectation on most projects in Mayfair, Belgravia, Knightsbridge, Chelsea, Kensington, Marylebone and St John’s Wood.

This article sets out what Tier 1 actually means for a joinery package in PCL, what HNW clients and architects should look for, and how the workflow differs from a standard residential commission.

1. The PCL boroughs and what makes them different

PCL is loosely defined as the seven postcode clusters where average residential prices exceed £2,500 per sq ft: Mayfair, Belgravia, Knightsbridge, Chelsea, Kensington, Marylebone and St John’s Wood. Three things distinguish a joinery commission in these boroughs from any other UK address:

• Building stock — mostly Georgian or Victorian terraces, frequently listed, in conservation areas, with stringent local-authority controls (City of Westminster and Royal Borough of Kensington & Chelsea are the strictest in England).
• Construction managers run the site — firms like Walter Lilly, Faithdean, Knowles, R W Armstrong, 4C, Broadland and West Green operate as the “Tier 0” on these jobs and pre-vet every supplier.
• Client expectations — HNW clients typically have an architect, an interior designer and a project manager all reviewing the joinery package. Tolerance for snags is near zero.

2. What “Tier 1” means in practice

When a Tier 0 main contractor calls a joinery shop “Tier 1”, they mean the shop has demonstrably cleared all of these:

• £10m public liability insurance as a minimum — many PCL projects ask for £25m.
• £5m+ professional indemnity covering bespoke design.
• Independent vetting — financial accounts, CIS/HMRC standing, GDPR compliance, modern slavery policy, and at least two reference projects on similar PCL addresses within the last 24 months.
• Health & safety — CHAS or SafeContractor accreditation, full RAMS for every install package.
• Lead-time discipline — the joinery programme integrates into a master programme with weekly lookahead reviews. Slippage on a PCL job costs the client £5k–£25k a week in extension-of-time and prelims.
• Finish standards — visible joinery is hand-finished to a level that survives white-glove handover. This includes proper grain matching across panel runs, no visible fixings, French-polish or hand-rubbed lacquer rather than spray-only.

3. Materials and finishes that pass white-glove

Across our PCL projects, the recurring specifications include:

• Quarter-sawn European oak, walnut or American black walnut — consistent grain, dimensional stability.
• Solid versus veneer — solid stock for visible structural members, premium veneers (1.0mm+) on large flat panels to maintain grain match.
• French polishing — on heritage projects and most reception-room joinery. Done in our workshop, not on site.
• Hand-rubbed lacquer — for contemporary kitchens and wardrobes; we use a 7-stage process with sanding between coats.
• High-gloss polyester — for piano-finish kitchens and feature panels. Demands a workshop with strict humidity and dust control.
• Ironmongery — typically Joseph Giles, Samuel Heath, or bespoke pieces sourced through Cox London or A&H Brass.

4. The CAD-to-installation workflow we use on PCL

1. Concept review — we sit with the architect and interior designer, mark up the GA drawings, flag buildability and lead-time issues before tender.
2. Tender response — itemised price, programme, and value-engineering options. We never tender below cost; clients pay for our depth on PCL.
3. Shop drawings — 1:5 and 1:1 details for every junction. Issued for architect & designer comment, then frozen.
4. Workshop fabrication — in our Suffolk workshop. Each piece tagged, photographed, and packaged for transit.
5. Site delivery & install — our two-man install crews on PCL jobs are CSCS-carded and work to our setting-out.
6. Snag & handover — we attend the snag walk with the project manager, agree the punch list on the day, return within 10 working days to clear it.

5. Selected PCL projects

• Grosvenor estate office, Mayfair — panelling, jib doors, fan-coil-unit covers, new staircase.
• Sloane Square residence, Chelsea — walnut bathroom panelling, hidden doors, TV wall.
• Eaton Place, Belgravia — stainless bathroom vanity unit, polished stainless side doors.
• South Kensington residence — kitchens, wardrobes, doors, garage doors. c. £235,000+VAT.
• Park Lane, Mayfair — bespoke steel fence, c. £15,000+VAT.

Specifying a Tier 1 joinery package in PCL

If you are an architect, interior designer or main contractor specifying a joinery package in any of the seven PCL boroughs, we are happy to issue our pre-qualification pack — insurance, accreditations, recent project references and shop-drawing samples — on first contact, with no commercial commitment.

Contact the studio to request the pack.

For the practical side of a London commission, from the areas we work in to the windows, doors and staircases we make for period townhouses and our current lead times, see bespoke joinery in London and the Home Counties.