Managing Multiple Trades: Renovation Timeline Guide

Most London renovation projects do not fall apart because of bad workmanship. They fall apart because the right tradespeople are not on site at the right time, in the right order, with the right information.

A plasterer who arrives before the first-fix plumbing is done. An electrician who cannot start because the structural opening is still wet. A tiler waiting three days because the adhesive bed was laid before the underfloor heating pipes were pressure-tested. Each delay compounds the next, costs money, and frays trust between you and the people building your home.

This guide explains how professional trade sequencing works, what realistic timelines look like for London projects, and why a dedicated project manager is often the single highest-value decision you can make on a complex renovation.

The Renovation Sequence — Why Order Matters More Than Speed

A renovation is not a list of tasks. It is a dependency chain. Every trade either enables or blocks the one that follows it. Getting that chain right is the core skill of managing a building project.

First fix: the foundation of everything that follows

“First fix” refers to all the work that happens inside walls, floors, and ceilings before they are closed up. It includes:

Structural alterations — removing walls, installing steel beams, forming new openings
First-fix plumbing — soil pipes, hot and cold water supplies, waste runs
First-fix electrics — consumer unit, cable routes, back-boxes for sockets and switches
First-fix heating — pipework for radiators or underfloor heating, boiler flue routes
Mechanical ventilation — ductwork for MVHR systems or extract fans

All of this must be complete — and in most cases inspected by a building control officer — before a single piece of plasterboard goes up or a plasterer mixes their first batch.

Why plumbing and electrics must come before plastering

This is the sequencing rule that surprises most homeowners commissioning their first major renovation. The logic is straightforward:

Plumbers and electricians need unrestricted access to run pipes and cables through joists, stud walls, and masonry.
Once those services are in place, building control needs to inspect the work (on notifiable projects) before it is concealed.
Only after sign-off can the walls and ceilings be boarded and plastered.
Plastering then introduces significant moisture into the building. That moisture must dry — typically two to four weeks depending on ventilation, heating, and the season — before any second-fix work, tiling, or decorating can begin.

Skipping or compressing any of these steps does not save time. It creates expensive problems: pipes punctured by second-fix screws, replastering after a missed cable route, or tiles cracking over plaster that was never given time to fully cure.

The cost of getting the sequence wrong

The direct financial cost of sequencing errors is rarely small. Replastering a room in London typically costs £800–£2,000 depending on size. Chasing out and re-running a missed cable route, then making good the plaster, can cost £500–£1,500. But the indirect costs — programme delays, trade remobilisation fees, accommodation costs if you are living out during the work — frequently dwarf the direct ones.

A week’s delay on a mid-size London renovation, with trades standing idle or being stood down and rebooked, can easily cost £1,500–£3,500 in wasted labour alone.

The Trades Involved and When Each One Steps On Site

A realistic trade sequence for a London home renovation

The following sequence applies to a typical full-house renovation or substantial refurbishment. Smaller projects omit some stages; extensions and loft conversions add structural phases at the beginning.

Stage	Trades On Site	Typical Duration
Strip-out and demolition	General labour, structural engineer sign-off	1–3 weeks
Structural work	Structural engineers, steel fabricators, groundworkers	1–4 weeks
First-fix plumbing	Plumber	1–2 weeks
First-fix electrics	Electrician	1–2 weeks
First-fix heating	Heating engineer / plumber	3–7 days
Building control inspection	Inspector (sign-off required)	1 day + notice period
Plastering and boarding	Plasterer / dryliner	1–3 weeks
Plaster drying	— (no trades on walls)	2–4 weeks
Second-fix carpentry	Carpenter/joiner	1–2 weeks
Second-fix plumbing	Plumber	3–7 days
Second-fix electrics	Electrician	3–7 days
Tiling	Tiler	1–2 weeks
Kitchen and bathroom fitting	Kitchen fitter, bathroom specialist	1–3 weeks
Decoration	Painter and decorator	1–3 weeks
Flooring	Floor layer	3–7 days
Snagging and handover	All trades as required	1–2 weeks

These durations overlap in practice — a skilled project manager runs trades in parallel wherever the sequence allows. But they cannot be entirely compressed without creating conflicts.

Where loft conversions and extensions change the order

Loft conversions introduce a weatherproofing phase before internal works can begin: dormer or hip-to-gable structural works, new roof covering, and window installations must create a watertight shell. Work cannot proceed inside until that shell is secure.

Extensions add a groundworks and substructure phase — excavation, foundations, drainage, slab or beam-and-block floor — which must complete and achieve adequate strength before the superstructure goes up. In London, party wall issues, proximity to existing drainage, and ground conditions (particularly in areas with clay-heavy soil prone to shrinkage) can add unpredictable time here.

Communication Protocols That Prevent On-Site Conflicts

Single point of contact vs. managing trades yourself

When a homeowner directly manages multiple trades without a dedicated project manager, information almost always falls through the gaps. Each trade arrives with their own understanding of the scope, their own assumptions about what has already been done, and limited visibility of what the next trade needs from them.

The result is predictable: a plumber routes pipework through a zone the electrician needed for a cable run. A carpenter fits a door lining before the tiler has established a finished floor level. A decorator primes walls before the electrician has fitted all the back-plates.

A single point of contact — whether that is a dedicated PM, a main contractor, or a highly experienced site foreman — means every trade receives consistent, current information. Decisions made on Monday are communicated to every trade by Tuesday morning, not discovered by one of them three days later when they are already mid-task.

How information gaps cause expensive rework

Three scenarios account for the majority of rework on London renovation projects:

Scope changes not communicated to downstream trades. The homeowner upgrades a shower enclosure specification after the plumber has already set the waste position. The waste now needs to move.
Assumed coordination that never happened. The kitchen designer specified an island unit with an integrated hob, but nobody told the electrician the circuit needed to be a dedicated 32-amp radial. The consumer unit now needs a new way.
Drawings not issued to trades. The architect updated the layout drawing, but the builder was working from an earlier version. The partition wall is in the wrong place.

None of these are unusual. All of them are preventable with structured communication.

What good daily and weekly communication looks like

On a well-run project:

Daily: The site manager or project manager does a morning walk-through with the lead operative for each trade. Blockers are identified and resolved before they cost a half-day of standing time.
Weekly: A short progress meeting (15–30 minutes) confirms what is complete, what is due next, and whether the programme is on track. Any design or specification queries are resolved with the homeowner or designer in the same window.
Documented: Changes to scope, specification, or programme are recorded in writing — even informally via email — so there is no ambiguity when an invoice arrives.

The homeowner does not need to be in all of these conversations. They need to trust that these conversations are happening and that they will be escalated to them only when a decision is required.

How a Project Manager Reduces Delays and Trade Conflicts

What a project manager actually does on a renovation

The title sounds administrative. The work is largely logistical, relational, and preventive. A good project manager on a London renovation:

Builds and maintains the programme. Not a wish-list timeline, but a realistic dependency-sequenced schedule that accounts for lead times, drying times, inspection windows, and the availability of each trade.
Procures and coordinates trades. Confirms start dates, manages access, resolves clashes in the sequence before they become clashes on site.
Manages information flow. Ensures current drawings, specifications, and instructions are with the right people at the right time.
Handles variations. When the homeowner changes something — and they almost always do — the PM quantifies the time and cost implication before the change is instructed, not after.
Manages quality at each stage. Inspection of first-fix work before boarding; checking plaster quality before second fix; snagging inspections before each trade demobilises.
Deals with the unexpected. Discovering hidden drainage, asbestos-containing materials in artex ceilings, or inadequate existing structure is not rare in London’s older housing stock. A PM manages the response without it becoming a crisis.

The London-specific complications a PM navigates for you

London renovations carry a specific set of complications that add coordination complexity:

Party Wall Act notices and awards. Work affecting a shared wall, boundary, or excavation near a neighbouring property requires formal notice and, if the neighbour dissents, a surveyor-negotiated party wall award. This can add eight to ten weeks to the pre-construction programme if not started early enough.
Access and logistics. Skips, scaffold, material deliveries, and trade parking in dense urban areas require advance planning and, in some boroughs, permit applications.
Conservation areas and listed buildings. Additional consent requirements change the planning and procurement sequence significantly.
Lead times for materials. Structural steel, specialist windows, bespoke kitchen units, and some bathroom products have six to fourteen week lead times. A PM identifies these items early and orders them to arrive on programme, not after the cavity is waiting.
London’s aging housing stock. Victorian and Edwardian properties routinely reveal conditions — inadequate foundations, non-standard joist sizes, historical modifications without building regulations approval — that require structural engineer input and can alter the sequence.

Building a Realistic Timeline for a London Renovation

Typical durations by project type

These are honest, experienced estimates for London projects. They assume a competent main contractor or project manager coordinating trades, reasonable decision-making speed from the homeowner, and no major unforeseen structural issues.

Project Type	Typical Construction Duration	Total Project Duration (incl. planning/design)
Single-storey rear extension	10–16 weeks	6–12 months
Loft conversion (dormer)	12–20 weeks	6–12 months
Full house renovation (no extension)	16–30 weeks	4–8 months
Full house renovation with extension	24–40 weeks	9–18 months
Kitchen and bathroom refurbishment	4–8 weeks	2–4 months

These figures include the full construction sequence from strip-out to snagging. They do not include the design, planning application, or tender process — which are additional pre-construction stages.

The buffer rule: why you need contingency built in

Every serious construction programme includes a contingency allowance — typically 10–20% on duration for complex projects. This is not pessimism. It is the realistic acknowledgement that in construction, particularly in London’s older housing stock, unexpected conditions are the norm rather than the exception.

If you are planning around a hard deadline — a school term, a lease expiry, a family event — build your contingency backwards from that date, not forwards from a hoped-for start. The buffer belongs at the end of the programme, protecting your deadline, not distributed throughout as slack.

Red flags that your timeline is being underestimated

A quoted timeline that looks attractive may be hiding real problems. Watch for:

No drying time allowed. Any programme that moves directly from plastering to second fix and decoration within a week is either using rapid-set materials (which have appropriate uses and significant limitations) or is not accounting for drying time at all.
Trades overlapping where the sequence does not allow it. If the programme shows electrical second fix and tiling happening simultaneously in the same bathroom, ask how.
No building control inspection windows. Notifiable works require inspection. If these are not in the programme, the programme is incomplete.
No snagging period. A responsible contractor builds snagging time into the programme. A programme that ends with the last trade completing and no handover period is a programme that has nowhere to put the finishing work.
Very round numbers. “Eight weeks” is a marketing figure. “Seven weeks and four days” suggests someone has actually built the programme.

What to Ask Any Builder Before They Start

Before committing to a contractor for a multi-trade renovation, these questions will quickly reveal whether they have genuine project management capability or are planning to improvise:

Can you show me a phased programme that sequences each trade? A legitimate answer is a Gantt chart or at minimum a written sequence with durations. A vague answer — “we’ll work through it as we go” — is a warning sign.
Who is my single point of contact on site, and how often will I receive an update? If the answer is “you can call any of the lads,” you are managing the project.
How do you handle variations — changes I make during the build? A good contractor will explain their change control process. Any contractor who says variations are fine and will not affect price or programme is either very experienced at absorbing them or is not telling you the truth.
What is your process when you find something unexpected? Listen for: stop work, document what was found, assess impact, give you options, agree the way forward. Beware of: we just sort it out and tell you after.
How do you manage the interface between trades? This question separates contractors who manage trades from contractors who book them.

Conclusion

Renovation delays almost always have the same root cause: trades arriving in the wrong order, with the wrong information, without anyone actively managing the handoffs between them.

The sequence is not complicated once it is understood — structure first, services first-fix, close up, dry, second fix, finish. But maintaining that sequence across a real London project, with real lead times, real neighbours, real planning conditions, and real surprises inside the walls, requires active coordination, not good intentions.

If you are planning a renovation in London and you want to understand what a properly sequenced, realistically programmed project looks like for your specific property, MB Build & Design offers a no-obligation consultation. We will give you an honest assessment of timescales, trade requirements, and where the complexity in your project actually lies — before you commit to anything.

Looking for more practical detail?

Need a clearer system for communicating with contractors and trades? Read How to Manage Your Contractor and Multiple Trades.
Trying to understand why renovation programmes slip? Read Why London Renovation Timelines Slip—and How to Prevent Delays.
Preparing for practical completion and the final invoice? Read Snagging & Handover: Your Final Check Before Payment.