In the altogether | Features

Windows and doors: Comparison of life-cycle costs
PVCu	Good-quality PVCu; 30-year life
Year	1	5	10	15	20	25	30	35	40	45	50	55	60
Initial installation	1690	–	–	–	–	–	–	–	–	–	–	–	–
Glazing renewal	–	240	–	240	–	240	–	240	–	240	–	240	–
Cleaning	–	10	10	10	10	10	–	10	10	10	10	10	–
Replace ironmongery, Gaskets, etc	–	–	–	200	–	–	–	–	–	200	–	–	–
Replacement	–	–	–	–	–	–	1690	–	–	–	–	–	1690
Totals	1690	250	10	450	10	250	1690	250	10	450	10	250	1690
Present value of £1 at 2%	1	0.906	0.82	0.743	0.673	0.61	0.552	0.5	0.453	0.41	0.371	0.337	0.305
	1690	226.5	8.2	334.35	6.73	152.5	932.88	125	4.53	184.5	3.71	84.25	515.45
Total whole-life cost	4268.6
Timber	Good-quality softwood; 30-year guarantee against rot
Year	1	5	10	15	20	25	30	35	40	45	50	55	60
Initial installation	1636	–	–	–	–	–	–	–	–	–	–	–	–
Glazing renewal	–	Aug-00	–	240	–	240	–	240	–	240	–	240	–
Redecoration	–	250	250	250	250	250	–	250	250	250	250	250	–
Replace ironmongery, Gaskets, etc	–	–	175	–	175	–	–	–	175	–	175	–	–
Replacement	–	–	–	–	–	–	1636	–	–	–	–	–	1636
Totals	1636	490	425	490	425	490	1636	490	425	490	425	490	1636
Present value of £1	at 2% (difference between investment and inflation)
	1	0.906	0.82	0.743	0.673	0.61	0.552	0.5	0.453	0.41	0.371	0.337	0.305
	1636	443.94	348.5	364.07	286.025	298.9	903.072	245	192.525	200.9	157.675	165.13	498.98
Total whole-life cost	5740.717

External envelope: Brick cavity walls
with 25% blockwork and timber weatherboarding facing brick (£275/1000); 215 mm blockwork; painted softwood weatherboarding
Year	1	5	10	15	20	25	30	35	40	45	50	55	60
Initial installation	7411	–	–	–	–	–	–	–	–	–	–	–	–
Minor repairs	–	–	75	–	75	–	–	–	75	–	75	–	–
Repointing	–	–	–	–	–	–	750	–	–	–	–	–	750
Redecoration	–	256	256	256	256	256	–	256	256	256	256	256	–
Replace boarding	–	–	–	–	–	–	850	–	–	–	–	–	850
Totals	7411	256	331	256	331	256	1600	256	331	256	331	256	1600
Present value of £1 at 2% (difference between investment and inflation)
	1	0.906	0.82	0.743	0.673	0.61	0.552	0.5	0.453	0.41	0.371	0.337	0.305
	7411	231.936	271.42	190.208	222.763	156.16	883.2	128	149.943	104.96	122.801	86.272	488
Total whole-life costs	10446.663
with 50% blockwork and render facing brick (£275/1000); 215 mm blockwork; through colour render
Year	1	5	10	15	20	25	30	35	40	45	50	55	60
Initial installation	–	6633	–	–	–	–	–	–	–	–	–	–	–
Minor repairs	–	–	50	–	50	–	–	–	50	–	50	–	–
Repointing	–	–	–	–	–	–	500	–	–	–	–	–	500
Redecoration	–	–	637	–	637	–	637	–	637	–	637	–	637
Totals	6,633	0	687	0	687	0	1137	0	687	0	687	0	1137
Present value of £1 at 2% (difference between investment and inflation)
	1	0.906	0.82	0.743	0.673	0.61	0.552	0.5	0.453	0.41	0.371	0.337	0.305
	6633	0	563.34	0	462.351	0	627.624	0	311.211	0	254.877	0	346.785
Total whole-life costs	9199.188
with brick (£275/1000); Outer skin; 100 mm block inner skin
Year	1	5	10	15	20	25	30	35	40	45	50	55	60
Initial Installation	–	7381	–	–	–	–	–	–	–	–	–	–	–
Minor Repairs	–	–	–	100	–	100	–	–	–	100	–	100	–
Repointing	–	–	–	–	–	–	1000	–	–	–	–	–	1000
Totals	7381	0	100	0	100	0	1000	0	100	0	100	0	1000
Present value of £1 at 2% (difference between investment and inflation)
	1	0.906	0.82	0.743	0.673	0.61	0.552	0.5	0.453	0.41	0.371	0.337	0.305
	7381	0	82	0	67.3	0	552	0	45.3	0	37.1	0	305
Total whole-life cost	8469.7