Screeding for extensions and renovations
Screeding.com helps homeowners, builders and residential project teams request screeding estimates and quotations for extension, renovation, refurbishment and conversion projects. Kitchen extensions, rear extensions, side-return extensions, garage conversions, renovations and refurbishments all bring their own constraints, and sand and cement screed, liquid screed and fast-drying screed options are considered alongside underfloor heating, floor levels and final floor finish planning. Each enquiry is reviewed against the project rather than fitted to a default approach.
Based in Gerrards Cross, Buckinghamshire.
Screeding for home extensions and refurbishments.
Extension and renovation projects vary widely, from single-room extensions and kitchen extensions through to open-plan living areas, garage conversions, renovations and wider refurbishments. The following gives a sense of the enquiries the Screeding.com team regularly reviews. Acceptance is not assumed by project type, and each enquiry is confirmed against the floor build-up, access, screed type and intended floor finish before a formal quotation.
Single-room extensions
Single-room extensions where the new screed must tie in with existing floor levels and the intended floor finish across the threshold.
Kitchen extensions
Kitchen extensions where appliance layouts, drainage routes and floor finish height all influence screed depth and tolerances.
Rear and side-return extensions
Rear and side-return extensions where new screed often meets existing rooms at door thresholds and changes of finish.
Open-plan living areas
Open-plan kitchen, dining and living spaces where larger pours and consistent levels matter to the final floor finish.
Garage conversions
Garage conversions where the existing slab, damp proofing, insulation and build-up depth all need review before screed type is confirmed.
Renovations
Whole-room or whole-floor renovations where existing screed or substrate may need assessment before new screed is installed.
Refurbishments
Refurbishment projects where floor levels, build-up depth and access through occupied or part-occupied properties shape the install.
Uneven existing levels
Projects with uneven existing floor levels where levelling, build-up depth and tie-in with adjoining rooms need to be agreed.
Mixed substrates
Projects with different substrates between rooms or zones where bonded, unbonded or floating systems may be considered.
Floor finish planning
Tile, timber, vinyl, resin and stone finishes that influence screed type, surface regularity, drying and moisture testing requirements.
Choosing the right screed for extensions.
The right screed for an extension or renovation depends on the build-up depth, area, any underfloor heating, intended floor finish and the wider programme. Each option below is considered against the project specification rather than treated as a default for domestic work.
Sand and cement screed
Traditional bonded, unbonded and floating sand and cement screed for extension and renovation projects where the build-up, area and depth suit a traditional system.
Liquid screed
Flowing calcium sulphate and cement-based liquid screed for larger open extensions and renovation areas with UFH, subject to follow-on finish requirements and any laitance treatment.
Screed over underfloor heating
Screed installed over UFH pipework in extensions and renovations, where cover, curing, commissioning and floor finish timing are planned together with the UFH and screed manufacturer guidance.
Fast-drying screed options
Fast-drying screed systems considered for time-sensitive extension and renovation programmes. Drying performance is system-dependent and confirmed against the specification.
Underfloor heating in extensions.
Underfloor heating is common in modern extensions and renovations. Screed depth, pipe coverage and system guidance all matter, and commissioning should follow the UFH and screed manufacturer guidance rather than fixed assumptions. Floor finish dates should be planned around drying and moisture requirements so room readiness is not built around unrealistic timings.
Access, levels and existing buildings.
Renovation and extension projects often need early clarity on how the working area is reached and how the new screed ties in with the existing building. The following are typical points the Screeding.com team reviews against each enquiry. On-site attendance, parking solutions and turnaround times are not promised before the project has been reviewed.
Access through the property
How materials reach the working area through hallways, side passages, garden access or scaffolding is reviewed before screed dates are committed.
Parking and material delivery
On-street parking, drop-off space and delivery vehicle access need to be considered for both bagged and pumped materials.
Floor levels
New screed levels and tie-ins with adjoining rooms, thresholds and external doors should be confirmed against the floor finish plan.
Build-up depth
Available build-up depth between substrate and finished floor level determines which screed systems are realistically suitable.
Existing substrates
Existing slabs, beam-and-block floors or older screed may require assessment before a new screed system is confirmed.
Insulation
Insulation type, thickness and supporting layers all affect screed depth and which systems can be used.
Damp proofing by others
Damp proofing or DPM works are typically completed by others; their detailing should be confirmed before screed is installed.
Door thresholds
Internal and external door thresholds and floor finish heights need to be coordinated with the screed depth.
Floor finish height
Tile, timber, vinyl and stone finishes have different thicknesses that influence screed level and tie-ins.
Other trades on site
Sequencing with builders, plumbers, electricians, UFH installers and floor finish trades is reviewed against the wider programme.
Drying times and floor finishes.
Walking on screed and fitting the final floor finish are different milestones on an extension or renovation. Drying depends on screed type, depth, ventilation, humidity, temperature and on-site conditions. Moisture testing may be required before sensitive floor finishes such as timber, vinyl or resin, and laitance removal may be required for some liquid screed systems before bonded finishes. Fixed day, week or hour readiness figures are not given before the project has been reviewed.
Read the screed drying times guide · Compare sand and cement vs liquid screed
Surface regularity and BS 8204.
BS 8204 is the relevant industry guidance for screed installation in the UK, and SR1, SR2 and SR3 describe surface regularity classes referenced in specifications. For extension and renovation projects the required class should be agreed against the intended final floor finish and the project specification, and is not an automatic guaranteed outcome of any particular screed system.
Estimate or quotation route.
Simple domestic extensions may start with the instant estimate route for a non-binding indicative figure on straightforward sand and cement work. Larger renovation, builder-led or drawing- and specification-led projects may suit the commercial quotation route so photos, drawings, areas, depths and floor finish information can be reviewed properly before a formal quotation is issued.
Get an instant estimate · Request a commercial quotation · Residential screeding · Main contractor screeding
Location relevance.
For location-specific quotation routes, you can also review London screeding enquiries and Buckinghamshire screeding enquiries. Site details, access and specification should be reviewed before works are confirmed.
Two routes for extension and renovation screeding enquiries.
Instant estimate.
Simple domestic extensions with a known area and depth may start with the instant estimate route for a non-binding indicative figure on straightforward sand and cement work. The result is reviewed before a formal quotation.
Commercial quotation.
Larger renovation, builder-led or drawing- and specification-led extension projects should send photos, drawings, build-up details, UFH information and intended floor finishes for review by the Screeding.com team.
Common questions.
What screed is best for a house extension?
There is no single best screed for a house extension. Sand and cement screed, liquid screed and fast-drying screed options are all considered for kitchen extensions, rear extensions, side-return extensions and similar projects. The right choice depends on the floor build-up, depth, area, any underfloor heating, the intended final floor finish and the wider site programme, and should be confirmed against the project specification rather than picked from a generic rule.
Can screed be used over underfloor heating in an extension?
Yes. Screed is commonly installed over underfloor heating in extensions and renovations. The screed type, cover over pipes, curing period, UFH commissioning sequence and floor finish timing should be reviewed against the UFH specification and the screed manufacturer guidance before installation, rather than treated as a default outcome on any particular project.
Is liquid screed suitable for renovation projects?
Liquid screed is often considered for renovation and refurbishment work, particularly over larger open areas, underfloor heating or where programme pressure is involved. Suitability depends on the existing substrate, build-up depth, follow-on floor finishes and any laitance treatment that may be required. Each renovation enquiry is reviewed against its own drawings, photos and specification before a formal quotation.
What information helps with an extension screeding estimate?
Helpful details include the floor area in square metres, intended screed depth or available build-up, screed type if already specified, any underfloor heating information, the intended floor finish, photos of the existing substrate, access notes and any drawings or specifications. The more context shared up front, the more useful the review and resulting estimate or quotation will be.
How long does screed take to dry in an extension or renovation?
Drying depends on the screed system, depth, ventilation, temperature, humidity and any UFH commissioning programme. Walking on screed and laying a floor finish are different milestones, and moisture testing may be required before sensitive finishes such as timber, vinyl or resin. Manufacturer guidance and the floor finish requirements should be referenced when planning extension and renovation programmes rather than assuming fixed day counts.
What does BS 8204 mean for domestic screeding?
BS 8204 is the relevant industry guidance for screed installation in the UK. SR1, SR2 and SR3 describe surface regularity classes used in specifications. For domestic extension and renovation projects, the required class should be agreed against the intended floor finish and project specification at design stage, and is not an automatic guaranteed outcome of any particular screed system.
Should I use the instant estimate or commercial quotation form?
Simple domestic extensions with a known area and depth may start with the instant estimate route for a non-binding indicative figure on straightforward sand and cement work. Larger renovation, builder-led or drawing- and specification-led projects should use the commercial quotation route so photos, drawings and specifications can be reviewed before a formal quotation is issued.
Tell us about the extension or renovation.
Share photos, drawings, areas, depths, any UFH details and the intended floor finishes. The Screeding.com team reviews extension and renovation screeding enquiries against site details, specification, access and programme before a formal quotation.